hybridfree/eevblog-posts huggingface dataset:
Anyone remember a SIMM-based hardware project - Page 1
Forum section: electronics / general

author: ColCon
author_rank: Contributor
timestamp: September 30, 2019, 04:22:50 pm
content: I seem to remember a SIMM-based hardware project, i think 30 pin, with various plug-in modules other than memory.Basically a mini back plane processing concept. Anyone know what I'm taking about?

author: ledtester
author_rank: Super Contributor
timestamp: September 30, 2019, 04:56:22 pm
content: Was it the "Simmstick"?https://www.dontronics.com/ssinfo.html

author: ColCon
author_rank: Contributor
timestamp: September 30, 2019, 05:21:09 pm
content: That's it! Thank you!Page was last modified on 07/02/2006.

author: Gribo
author_rank: Frequent Contributor
timestamp: October 25, 2019, 01:51:48 pm
content: There are many SOM's out there. Raspberry PI compute module is one example.

author: Doctorandus_P
author_rank: Super Contributor
timestamp: July 02, 2020, 07:23:53 pm
content: My first thought also was the Dontronix module.When I type in a simple search I get lots of results from multiple manufacturers:https://www.startpage.com/row/search?q=som+simm+module&l=english

author: wizard69
author_rank: Super Contributor
timestamp: July 02, 2020, 08:23:11 pm
content: yes there are lot of people trying to promote this sort of idea. It might be a good idea but there really needs to be a standard. The Arduino and Raspberry PI form factors have become defacto standards with wide adoption, but I'm not sure anybody leads in the SIMM world. Sadly the Arduino and PI formats never appeared to be well thought out to me.Quote from: Doctorandus_P on July 02, 2020, 07:23:53 pm

author: tooki
author_rank: Super Contributor
timestamp: February 15, 2021, 11:02:23 pm
content: Quote from: wizard69 on July 02, 2020, 08:23:11 pmWell, I'd expect SIMM designs to be going the way of the dodo, since SIMM memory became obsolete in the mid-1990s. 30-pin SIMM was obsolete by around 1990 and you can't readily get sockets any more. (72-pin SIMM is still available.)

author: wizard69
author_rank: Super Contributor
timestamp: February 22, 2021, 05:59:54 pm
content: Quote from: tooki on February 15, 2021, 11:02:23 pmIt does make you wonder why anybody would use a function specific card edge connector for a general purpose backplane. It isn't like the catalogs are not filled with more generic card edge connectors or header type connectors.
Bus pirate V4 connection problem with windows 7 - Page 1
Forum section: electronics / general

author: ifrenide
author_rank: Regular Contributor
timestamp: December 25, 2020, 11:39:12 pm
content: Hello, recently I made a Bus pirate V4 , I soldered components , and I uploaded both bootloader and firmware respectively , I also installed INF file in device manager I've got an Error 10 msg .when I plugged Bus pirate to my computer which has windows 7 on it , I see no msg or notification, nothing happened at all, even I'm sure that I programmed it correctelly.I want jus to note that USB led is on all the time whenever bus pirate v4 is plugged to my laptop.best regardsWhy I have this Error 10 "device can't start" ? (I'm sorry my windows is french one)Please help me I don't know if the problem with my Bus pirate V4 or with windows 7?.Regards.

author: RoadRunner
author_rank: Frequent Contributor
timestamp: December 27, 2020, 11:45:00 am
content: This appears to be driver compatibility issue, Buspirate uses microchip part. I don't what is the support status of Windows 7. But you can get latest driver or the one which works on windows 7 from microchip Archives.
Online interactive assembly guides for Eagle and KiCad projects - Page 1
Forum section: electronics / general

author: kasbah
author_rank: Contributor
timestamp: October 15, 2020, 11:47:12 am
content: We've just deployed Eagle support for our Interactive HTML BOM integration onkitspace.org. KiCad has been supported for a few months now.This integration gives projects a guide that helps with DIY assembly by showing component locations and letting you check them off as you go. Here are some examples:* The Open Book (DIY ebook reader)page|assembly guide* DIY Particle Detector (electron detector variant)page|assembly guide* AAduino (Arduino clone that fits in an AA battery holder)page|assembly guideCheck out the rest of the projects on Kitspace for more. This is all possible thanks to the awesomeInteractive HTML BOMand KiCad (which can import Eagle projects).If you have an open source project that could benefit from having a guide like that, you should add it to Kitspace! Let me know if you need any help with that.

author: Ranayna
author_rank: Super Contributor
timestamp: October 21, 2020, 12:26:18 pm
content: That looks awesomeFor larger boards like in your first example, would it be possible to setup a hotkey to zoom in to the specific area of the board where the part should be placed? Hitting it again should jump to the next position for lines with multiple items. Or maybe enable that only in ungrouped mode.I like that you can click on components to get to the BOM item, but it can be difficult to actually hit the component. In this assembly view, is it actually useful to be able to click on traces or pads? For pure assembly i would think that clicking on a pad should select the component to which the pad belongs.Minor nitpick: In the BOM itself, the table headers "Sourced", "Placed" and "Quantity" are broken, that looks very odd, and the column width cannot be adjusted to make them fit.Sorting for the proper assembly order (i.e. part height, parts blocked by other parts, and stuff like that) has to be done manually by whomever creates the BOM, i assume?

author: kasbah
author_rank: Contributor
timestamp: October 22, 2020, 01:42:34 pm
content: Thanks Ranayna, those are all very fair points. I think they would all need to be addressed in the upstream project though. Do you mind adding your feedback there?https://github.com/openscopeproject/InteractiveHtmlBom/issues/newThe order is left undecided, yes. Would be cool to specify it though.
Reverse Engineering Platform - Page 1
Forum section: electronics / general

author: D4no0
author_rank: Contributor
timestamp: February 18, 2020, 02:07:32 pm
content: Hello,I was wondering is there a unified platform where people can post reverse engineered products?I'm asking because these days I was trying to repair an iHealth Edge "smartwatch". The problem with it was a unsuccessful firmware update, making it bootloop. I was thinking that maybe there are some hardware problems, like dead battery since there were some mobiles that would have similar behavior. Upon opening and inspecting it, the only problem is the software. I contacted the company and they showed me the middle finger.I'm diverging from the main question. The fact that I liked is that I was able to disassemble the device easily thanks tohttps://www.ifixit.com/, the style of "guides" that they have are very clear opposed to forum style that I could find on reverse engineering.If there isn't such a platform, I'd be happy to make one.Even if you don't know of such platforms, I'd be happy to listen to your opinion on creating such a platform.

author: kasbah
author_rank: Contributor
timestamp: February 24, 2020, 02:47:18 am
content: Isn't iFixit itself such a platform? They even have a section for tear downs.https://www.ifixit.com/Teardown

author: D4no0
author_rank: Contributor
timestamp: February 27, 2020, 10:09:51 pm
content: In a way you're right, however what I meant is reverse engineer of circuits, firmware. A great example would be BigClive channel.

author: kasbah
author_rank: Contributor
timestamp: August 31, 2020, 12:42:17 pm
content: I see what you mean, yeah. Maybe a good start could be to have an online aggregator forOpen Board Viewfiles.I guess that's just my approach in testing ideas like this. Start aggregating projects, then try and build the software to help, i.e. the "platform" as you goo. I take this approach for e.g.kitspace.organd for mycollection of KiCad footprints.
BenchTop/Tabletop centrifuge electronics design - Page 1
Forum section: electronics / general

author: arul
author_rank: Regular Contributor
timestamp: June 15, 2020, 01:15:22 pm
content: Hi,How do I design a Lab BenchTop/Tabletop centrifuge for medical application? I need a suggestion for both electronics and mechanical section?Kindly I ask you, if any one done this design, give your guidance.Advance in thanks.
Yet another Open Source ventilator - Page 1
Forum section: electronics / general

author: Jef06
author_rank: Newbie
timestamp: April 21, 2020, 10:06:48 pm
content: https://github.com/makers-for-life/makair/

author: jackthomson43
author_rank: Contributor
timestamp: May 02, 2020, 09:35:53 am
content: Good job. Badly needed these days. Support Open Source Content. I am also designing a similar one using Microcontroller following thisWhat is a Microcontroller?
µCurrent Switches, are they really make before break? - Page 1
Forum section: electronics / general

author: rssd
author_rank: Newbie
timestamp: May 23, 2020, 03:43:02 pm
content: I was wondering if the switches in the current BOM of the µC really are "make before break". The datasheet does not specify any information.https://www.ckswitches.com/media/1423/l.pdfL203011MS02Q

author: rssd
author_rank: Newbie
timestamp: May 23, 2020, 05:21:55 pm
content: Another thing which seems to have changed is that the LED is always on? Can someone confirm, doesn't that drain the battery quite quick?
I2C NavKey - Open source project - Page 1
Forum section: electronics / general

author: Atika
author_rank: Contributor
timestamp: April 11, 2019, 01:29:31 pm
content: Hello,Our open source project I2C NavKey is finally online!https://hackaday.io/project/164886/gallery#ea535b172d46f1798d66d19a6269e293An article is just published by hackaday today, check it out:https://hackaday.com/2019/04/11/a-bolt-on-i2c-navigation-key-for-your-next-project/The source code and design files are fully available on GitHub:https://github.com/Fattoresaimon/I2CNavKey

author: ebastler
author_rank: Super Contributor
timestamp: April 13, 2019, 07:28:18 am
content: Neat! I am curious about durability however:- What kind of contacts/switches do you use?- Is the wheel read optically or contact-based?- Is there a specification on durability (how many switch and wheel operations)?Thanks!

author: Atika
author_rank: Contributor
timestamp: April 14, 2019, 04:21:33 pm
content: Thank you!The joypad is the following:https://www.ckswitches.com/media/1346/tsw.pdfAll the contact is mechanical and from the datasheet all the contact have 1M cycle rotation life for each direction.BR,

author: blubillcanada
author_rank: Contributor
timestamp: May 17, 2020, 03:56:41 pm
content: It's too bad that the series of navigation switches are discontinued.

author: Atika
author_rank: Contributor
timestamp: May 18, 2020, 11:07:17 am
content: Yes C&K has retired that product.But there is another company called Zippy that have the exactly same components, both white and black.I don't know if there is some relationship between the two company.Anyway the product is still alive and available!https://www.tindie.com/products/saimon/i2c-navkey-7-functions-joypad-on-the-i2c-bus
DSP_ICE_rev2 - Page 1
Forum section: electronics / general

author: radioactive
author_rank: Regular Contributor
timestamp: May 12, 2020, 02:36:36 am
content: Here is an STM32H743 / ICE40 8K dev board I worked on last year. I may offer physical hardware / firmware at some point in the future, but the design is valid and I decided to share today, so here it is:https://github.com/tvelliott/dsp_ice_rev2in eagle 7.6 format. FSMC connections to the FPGA work great and DMA can be used for access to the FPGA. Ethernet 100 Mbps works great. The only thing I didn't test was the SD card. So double check that before you build one. Sorry, just noticed I should not have posted this here without a special OSHW license. Mods, please move to Projects or delete if you want.
OSHW USB 4 channel 24bit DAQ with 2 current outputs. ADS122U04 based. - Page 1
Forum section: electronics / general

author: KZem
author_rank: Newbie
timestamp: April 15, 2020, 10:44:20 pm
content: Hello,I'm new to this forum and for starters I would like to share my latest hobby project.Its a small, 4 channel 24bit USB DAQ, with additional two current outputs. I have designed it around TI's ASD122U04 ADC, mostly because its one of few adc's that use UART interface (rather that SPI). That tempted me to design a system that would not require a micro-controller (and all the bagage that comes with it), just a simple UART to USB converter.The main design requirements where the following:- no uC with dedicated firmware- 4 single-ended, 2 differential channels or their combinations.- 2 current outputs- USB connection and power- 4 ranges up to 25V, separately set for each channel.- no dedicated drivers, all software runs in user-space- small form-factor- try to use parts easily obtainableThe ADS122U04 has quite a number of features of interest:- 4 single ended channels, 2 differential.- 2 Current DAC's (well, not normal dac's, they have just a couple of discrete settings, still better than nothing)- up to 2kSPS- 24bit (~20 ENOB)- fully UART programmable- has a few GPIO's- nice SMD packageFor the UART to USB bridge i chose Microchip's MCP2200 for a number of reasons:- has both UART and GPIO (I used those for range selections)- uses HID interface- fully specified, inc. register programming- Python code already published on GitHubThe PCB is 4 layer, made by JLC-PCBFull hardware design files are published on my GitHub:https://github.com/Hiperino/DAQ_24bit_HardwareThose are files for Rev 1.1.0, but the built hardware that I have is 1.0.0, because there where some errors along the way. Still the functionality is the same.I will publish more details later, along with some measurements and also the Python software.I'm very eager to hear any comments about this design and hope for a good discussion.In the future I plan publish more of my current and past projects, as time permits.Best Regards,KZem
Ventilator developed in Brisbane by Triple Eight Race engineering  - Page 1
Forum section: electronics / general

author: wilfred
author_rank: Super Contributor
timestamp: April 01, 2020, 07:41:48 am
content: I saw this on the news today. The Australian Supercar race team Triple Eight Racing had engineers with free time after the Formula One race was cancelled. This video shows their prototype. I think it is clever how they used an existing medical breathing device to form the basis of their device. It seems they just made a device to function as a mechanical hand. The link includes a video and a claim they intend to open source the design to assist implementing improvement quickly.https://www.abc.net.au/news/2020-04-01/supercar-engineers-create-ventilators-to-help-covid-19-crisis/12109718Since posting I have found out that this device is actually a well known approach as described in more detail here.An MIT students paper on their project. (PDF 9 pages )https://e-vent.mit.edu/wp-content/uploads/2020/03/DMD-2010-MIT-E-Vent.pdfIt included a comment about a forcast in 2005 indicating the US would need 742,500 ventilators in a worst case scenario. The more I read about this the more depressing the lack of preparedness is.And not just in the US.
Making USB3.0 1080p Auto focus camera with Acutelogic PE1005, 1Gbps UVC Stream - Page 1
Forum section: electronics / general

author: RoadRunner
author_rank: Frequent Contributor
timestamp: February 08, 2020, 12:53:34 pm
content: Quote from: RoadRunner on February 07, 2020, 10:42:57 pmAddition Video Details to the project.
Scullcom MilliOhm Meter Software - Page 1
Forum section: electronics / general

author: jfitter
author_rank: Contributor
timestamp: August 03, 2019, 03:12:31 pm
content: Several years ago Louis Scullcom published circuit for a "quite good" milliohm meter. An associate then improved the pcb layout and it was made available from OSH Park. This circuit used a DPM or Multimeter to display the resistance, which is fine if that's all you want, but more is possible with a micro.I had a need for such a meter to measure the winding resistances in 3ph motors I use in radio controlled aircraft. These values are quite small because the wires are very fat - my motors are 3 to 10kW. I make my own inverter/controllers and the published resistance figures are just a marketing fantasy making it difficult to tune the controllers.So here it is for anyone who is interested. Commercial jobbies are available from China for around 140AUD. This one is not quite as pretty but performs better and has more creature features.The pics are self explanatory. The instrument is auto-ranging and shows mV and uV. There is a protocol that defines when the reading is steady after which the filtered value and RMS deviation is displayed. The battery indicator is just a volt meter which works for Lithium chemistry. There is a USB charging port on the side. The battery is scavenged from a worn out laptop pack and so far I haven't charged it in a year of use.The switch is an old-fashioned mechanical one that kills the power to the circuit - no chance of bleeding the battery down with this circuit. Put it on the shelf and leave it there for two years and it will still work when you need it to.The software and hirez pics are on my github sitehttps://github.com/jfitter/MilliOhmMeter

author: yashrk
author_rank: Frequent Contributor
timestamp: August 30, 2019, 05:15:34 am
content: Nice Project!I was working on same project & was looking at the same Kelvin probes available from China, I would like to know, how is the quality of the Kelvin Probes you are using?

author: alex-sh
author_rank: Regular Contributor
timestamp: January 27, 2020, 09:36:31 pm
content: I recognise Barbouri's (Greg) PCB creation.Your LCD is way much better though.
Alibaba crafts world's 'fastest' 'open-source' RISC-V processor yet - Page 1
Forum section: electronics / general

author: Karel
author_rank: Super Contributor
timestamp: July 27, 2019, 10:20:07 am
content: Alibaba crafts world's 'fastest' 'open-source' RISC-V processor yet: 16 cores, 64-bit, 2.5GHz, 12nm, out-of-order execComing to an FPGA near you, soon, maybe, hopefully?https://www.theregister.co.uk/2019/07/27/alibaba_risc_v_chip/

author: SiliconWizard
author_rank: Super Contributor
timestamp: July 28, 2019, 03:10:04 pm
content: That's interesting.As I get it, the business model would rely on some kind of licensing obviously, so even if they release the full RTL source code as open source, which I'm not completely sure of yet, you are probably just going to be able to play with it and not much more.As for FPGAs, given the general specs of this processor, you would probably need a pretty big FPGA just to be able to put a single core of it...

author: brucehoult
author_rank: Super Contributor
timestamp: July 28, 2019, 05:16:52 pm
content: Yup, I'd expect even a single core won't fit on an Arty or other cheap Artix-7 board. We've recently changed our standard FPGA board for CPU development from the $3500 VC707 to the $8000 VCU118 (same FPGA as Amazon F1, IIRC). And you're still only running something of that complexity at not a lot more than 100 MHz.It's not clear what development stage Alibaba are at. They certainly weren't showing actual chips. They might not actually be ahead of other people.It will be good to get cores of this level out in silicon. On paper it should be competitive with the Cortex A75.

author: Petrary
author_rank: Newbie
timestamp: August 28, 2019, 10:44:36 am
content: That's interesting.
Require datasheet for ASUS-H110M-E mainboard chips to port coreboot for it. - Page 1
Forum section: electronics / general

author: pavelsayekat
author_rank: Newbie
timestamp: June 08, 2019, 11:55:12 am
content: I am looking for Nuvoton NCT5539D chip (http://www.bios-chip24.com/epages/63730052.sf/en_US/?ObjectPath=/Shops/63730052/Products/100002) datasheet and GigaDevice GD25B128CPIG 16MB bios chip (http://www.bios-chip24.com/GigaDevice-GD25B128CPIG-128MBit-SPI-Flash-DIP-8-300mil/en) datasheet as they are not available online for porting coreboot for my ASUS-H110M-E M.2 mainboard. And I tried to contact the chip companies but there's no reply,

author: coromonadalix
author_rank: Super Contributor
timestamp: June 29, 2019, 03:50:30 am
content: The only ones ive foundhttp://pdf1.alldatasheet.com/datasheet-pdf/view/1132722/NUVOTON/NCT5569D.htmlhttp://pdf1.alldatasheet.com/datasheet-pdf/view/1140492/NUVOTON/NCT5532D.htmlhttp://pdf1.alldatasheet.com/datasheet-pdf/view/1150073/GIGADEVICE/GD25B127D.html
PocketAdmin, an open source keystroke injection device / badusb - Page 1
Forum section: electronics / general

author: krakrukra
author_rank: Newbie
timestamp: February 23, 2019, 04:00:59 pm
content: Hello, I want to share my new project here. This is basically an improvedversion of USB rubber ducky, a keystoke injection tool made by hak5.for more information check its github here -https://github.com/krakrukra/PocketAdmin

author: krakrukra
author_rank: Newbie
timestamp: June 20, 2019, 01:19:45 pm
content: OK, so it's been a while, and I figured I should do an update.I have added a bunch of new features, such as:1. OS fingerprinter. the device can now detect which OS isinstalled on the computer it is plugged in and changeits behavior based on that.2. added support for multiple keyboard layouts, as well asan ability to change layout settings without doing firmwareupdate.3. added more commands such as HOLD, RELEASE, KEYCODE;added support for right-hand modifier keys;VID / PID changing is now possible with hex values, not decimals4. substantially improved documentation, created a github wiki.made a couple youtube videos here:https://www.youtube.com/channel/UC8HZCV1vNmZvp7ci1vNmj7gThe device is now basically feature complete, so I inviteeveryone to check it out.
Where to find Green Bean (GE appliance adapter) or how to build one - Page 1
Forum section: electronics / general

author: dmgctrl
author_rank: Newbie
timestamp: December 17, 2018, 06:06:43 pm
content: Hi,I hope this message finds you in good health and spirits.Like many other GeoSpring hybrid water heater buyers, I was very excited to get my water heater installed, only to find out later that control of the water heater seems less controllable than a regular water heater. I wanted to try GE's ConnectPlus, but they're not currently available and the reviews weren't very flattering. I'm of the idea that Green Bean is a more robust interface, but I can't find one to purchase. I was hoping someone here might know where to find a Green Bean interface to purchase, and if not, perhaps maybe your travels happened to come across a schematic or the ability to use an Arduino, Raspberry Pi or other device to directly monitor and control a GeoSpring water heater?

author: puddly
author_rank: Newbie
timestamp: May 26, 2019, 01:14:01 am
content: I also was never able to buy one so instead I've been working on a more versatile board to replace it. You can view the project here:https://github.com/puddly/casserole/. It gives you unfettered read/write access to the GE bus so you should be able to do more with it than with a Green Bean. I haven't included the appliance SDKs or really done much code beautification because I just wanted to remotely start my washer but if you're interested in helping out I can easily port the GE SDKs and make it more usable.
Clone Open-source digital oscilloscope "ScopeFun" - Page 1
Forum section: electronics / general

author: AndreZheng
author_rank: Contributor
timestamp: May 02, 2020, 01:13:24 pm
content: May 02, 2020Hola. I made a USB 3.0 + Artix-7 + DDR3 Core board. And now I want to add a daughter board with high speed ADC. Any recommendation for ADCs? How about HMCAD1511 which costs around 10$?BTW, if I use the firmware/software developed by ScopeFun designer, shall I also open source my hardware design source file? ThanksJULY 12, 2020The USB3.0(CYUSB3014) + Artix-7(XC7A35T) + 512MB DDR3 core board is ready.https://github.com/ChinaQMTECH/Artix7_USB3.0_Development_Board

author: OwO
author_rank: Super Contributor
timestamp: May 02, 2020, 02:00:15 pm
content: P O S T S C H E M A T I C S A N D L A Y O U T S please.

author: aussie_laser_dude
author_rank: Contributor
timestamp: May 02, 2020, 11:25:59 pm
content: I'd be interested to see any open source stuff, currently trying to make my own version for fun.

author: ADLab
author_rank: Newbie
timestamp: May 03, 2020, 07:37:16 pm
content: hi,Here is a web-based oscilloscope DIY using beaglebone black and Spartan-6 FPGA. It's based on our master thesis 5 years ago. Finally, we are allowed to distribute it.https://hackaday.io/project/171379-web-based-oscilloscope-diy-using-beaglebone-blackThe DSO part features 8 bits, 250 MS/s, 100 MHz bandwidth, dual channels, external trigger, no troublesome software installation (only web browser needed), software control panel and WiFi-range connectivity.

author: wizard69
author_rank: Super Contributor
timestamp: June 08, 2020, 08:46:55 am
content: If you want to distribute the software in any way you should make it open source. If this is a personal one off project it doesn't matter. It might be worth seeing of the ScopeFun developers are interested in supporting other boards. There are advantages and disadvantages to haveing one software base support multiple hardware solutions.In any event it would be interesting to see your documentation and code.Quote from: AndreZheng on May 02, 2020, 01:13:24 pm
ULX3S opensource FPGA board - Page 1
Forum section: electronics / general

author: goran.mahovlic
author_rank: Newbie
timestamp: April 27, 2019, 06:17:13 pm
content: Hi,member of my makerspace designed ULX3S opensource FPGA boardsyou can check board here, it is open from start...https://github.com/emard/ulx3shttp://radiona.org/ulx3s/Our board is used is already used on our university in Zagreb for learning digital logic!There is already lots of material for this board, and lots of samples you can tryout!https://www.youtube.com/watch?v=CR-pVxN-08kRecently we had two day workshop in our maker space, so there is great material for start using our board (or any other board) with open source toolchain!https://github.com/ulx3s/fpga-odysseus/blob/master/presentation/FPGA%20Odysseus.pdfThere is lots of other samples we have already done, and lot of samples we want to try!Only problem with this board is that is still not widely available.But we are working on that issue.We have ordered 100 bare PCB (that is minimum order if you want good price) of new design and next week we will confirm design.After that we will produce third batch of this board (100 pcs. 85F boards with 64Mb of SDRAM).Recently we submitted our board to Hackaday Prize so your like can help us to make this board more available and more affordable!!!https://hackaday.io/project/159108-ulx3s-powerful-ecp5-board-for-open-source-fpgaWe are already in top 5 projects, but it would really nice to stay there

author: goran.mahovlic
author_rank: Newbie
timestamp: April 28, 2019, 10:15:39 pm
content: Thank you all!!!We are at 3. place
SD2IEC - Page 1
Forum section: electronics / general

author: Kilroywashere
author_rank: Regular Contributor
timestamp: April 14, 2019, 11:25:18 pm
content: Is there an SD2IEC open source project for the commodore 64 and vic 20 ?anyone know how i could build one ?

author: ebastler
author_rank: Super Contributor
timestamp: April 19, 2019, 04:12:06 pm
content: For whatever reason, those SD card adapters for the C64 seem to be a German thing? Most of the relevant links Google found are pointing to German websites or forums.This guy has a history of about 12 generations of MMC and SD card adapters (in German, but Google Translate should make it digestible):http://www.pitsch.de/stuff/mmc2iec/The most recent homebrew version from user "Shadowolf", which seems to be the basis for the commercial product, is discussed in a looong forum thread here -- again requires translation from German:https://www.forum64.de/index.php?thread/21931-sd2iec-aufbau-thread/The PCB design files (Eagle) for that version are here. But I haven't seen the µC firmware at first glance; I'm sure there are links in the above forum thread.http://www.pitsch.de/stuff/mmc2iec/sd2iec_v1_2.zip

author: stj
author_rank: Super Contributor
timestamp: April 20, 2019, 02:33:46 pm
content: https://www.c64-wiki.com/wiki/SD2IEChttps://www.forum64.de/index.php?thread/46852-arm2iec-neue-hardware/

author: sajattack
author_rank: Contributor
timestamp: April 23, 2019, 06:30:09 am
content: I'd recommend building a Pi1541 instead. 100% compatible true drive emulationhttps://cbm-pi1541.firebaseapp.com/SD2IEC is not compatible with all disks.
GM328 white screen - Page 1
Forum section: electronics / general

author: spikeyhair
author_rank: Newbie
timestamp: February 27, 2019, 06:30:02 pm
content: Hi,I probably have posted in the wrong section so sorry about that.However I have built one of those gm328 component testers and am getting a white screen on power up. Can some one help me out please?Things I have tried so far:Checking mcu with avrdude using a usbtiny ISP. The chip wouldn't give a signature so replaced it with another m328p.Tried flashing various fw from links in this forum.The version of product is the colour TFT gm328 with rotatory encoder and frequency generator. I got it from amazon.https://www.amazon.co.uk/KKmoon-Transistor-Capacitance-Frequency-Generator/dp/B01HCU8VTM/ref=sr_1_3?ie=UTF8&qid=1551291890&sr=8-3&keywords=kkmoon+gm328Hope someone can point me in the right direction with fault finding this? Hopefully I have built it correctly and its just a firmware issue?Cheers!

author: Teledog
author_rank: Regular Contributor
timestamp: February 28, 2019, 04:03:54 am
content: Definitely wrong zone, but ...are you using a decent power supply?Those kits are infamous for white screens when using crappy batteries.G'luck!:-)

author: stj
author_rank: Super Contributor
timestamp: March 04, 2019, 05:55:20 am
content: it's NOT a GM328, those are green backlit monochrome.it's an "AY-AT" from some scumbag seller using the wrong description to get more search hits.the difference is important if you want to flash it - try AY-AT firmware.

author: drescherjm
author_rank: Contributor
timestamp: March 18, 2019, 07:39:29 pm
content: I had the same behavior on first power up of my GM328 2018 kit. The problem was fixed after I resoldered the male pin header for the display.
Android + Arduino - Page 1
Forum section: electronics / general

author: Maxlor
author_rank: Frequent Contributor
timestamp: January 08, 2014, 09:22:02 am
content: Coolest little thing I discovered this week. Yeah, you can program the Arduino right from your Android device (if it supports USB-OTG)!

author: fenclu
author_rank: Regular Contributor
timestamp: January 09, 2014, 07:33:01 pm
content: You might be interested in this Hackaday article:http://hackaday.com/2013/05/30/giving-the-nexus-4-a-serial-port/

author: Maxlor
author_rank: Frequent Contributor
timestamp: January 11, 2014, 09:22:31 am
content: Interesting, hadn't heard of that feature. Maybe I'll build a little adapter for it.

author: Quiggers
author_rank: Contributor
timestamp: March 18, 2014, 11:47:27 pm
content: Adafruit's bluefruit can be used for this too, wirelessly.personally I could do any decent amount of coding on a touch screen device, but I suppose I could buy a bluetooth keyboard.

author: sportq
author_rank: Regular Contributor
timestamp: March 19, 2014, 09:18:15 am
content: I read a few days ago that Google have pulled this app because it does in-app downloads from un-trusted sources. Those downloads are the Arduino libraries that are essential so it's future looks bleak.Peter

author: zapta
author_rank: Super Contributor
timestamp: June 13, 2014, 10:35:00 pm
content: Quote from: fenclu on January 09, 2014, 07:33:01 pmVery cool. Does this work with any Android device?Another option is to use serial Bluetooth. I was able to connect an arduino to an Android using the rn42 serial/BT module on the arduino side and the stock BT of a Nexus 5 (search google Play for 'bluetooth SPP' apps.)

author: Michael Rempel
author_rank: Contributor
timestamp: August 29, 2014, 08:24:34 pm
content: http://www.udoo.org/Quad Raspberry pie plus Arduino combatable. (Mega footprint)Got one. I use the Linux version myself, much faster and more flexible. Android is available for it, and it is ok but shows the limits of Java quite well. It doesnt have all the sensors of a phone but for the price... HDMI, Mouse, Keyboard, proto board and away you go right on the bench. It also has touch screen and camera options if you want that stuff. Cool little board from our Italian friends again.

author: Artlav
author_rank: Frequent Contributor
timestamp: August 29, 2014, 08:48:43 pm
content: Interesting, but what is the point?Android devices are generally not designed for text input, writing code on them is only plausible when there is nothing else available.No?

author: jasapelet
author_rank: Newbie
timestamp: March 12, 2019, 06:05:33 pm
content: yeah that they can't understand what ur mean broh?
GM328 Transistor tester wrong battery voltage - Page 1
Forum section: electronics / general

author: james3
author_rank: Newbie
timestamp: March 10, 2019, 01:36:09 pm
content: Hello,I just finished to assemble my Transistor Tester GM328, everything seems to work fine less than the battery voltage value that is always more (when I plug 9V it says 20V, when I plug 6V it says 18V) Any idea what's wrong ?UPDATE:I just found that I misplaced the 33K and the 3K3 resistance, now that they are in the right place it works perfectly
Open Source I/O module for PLC - Page 1
Forum section: electronics / general

author: yogece
author_rank: Contributor
timestamp: April 19, 2019, 10:57:25 am
content: Are there any opensource I/O (MODBUS/Profibus/Profinet) module for PLC?

author: Doctorandus_P
author_rank: Super Contributor
timestamp: April 20, 2019, 05:49:56 pm
content: Profibus is a proprietary and closed protocol with therefore stupidly expensive chips which implement it.Modbus is a simple and open standard with loads of projects (hardware & software) floating around the 'net.If you mention both in the same sentance, together with your question, then it clearly shows you have not done your own homework and do not deserve to waste the time of other people.Do your homework first, then come back if you have a serious question or get stuck on some details.
Xenon Electric bulb driver circuit - Page 1
Forum section: electronics / general

author: Md Mubdiul Hasan
author_rank: Regular Contributor
timestamp: February 06, 2019, 09:09:12 am
content: there,I am interested to electric bulb driver used in street lighting or any suitable area.Need to know how this circuit can work.Take a look the circuit in first attachment.1. 220 V ac has feed to 2 diode that could pick positive half cycle.2. On the junction point what the yellow componet does, is it a capacitor ? Using for discharging ?3. Whats the choke is doing here, looks it comes from bulb surface.4. Capacitor 330nF and SCR K1400E is triggering the negative part of this bulb?5. Does 460k, 1M ohm POT and 1.8 Mohm resistor parallel to bulb is maintaning current or voltage.6. Not sure other yellow component is doing here?Lets discuss together to learn more for further development.

author: Ian.M
author_rank: Super Contributor
timestamp: February 06, 2019, 09:58:31 am
content: A picture of the bulb + closeup of any writing on its base or envelope would help. I suspect its a discharge lamp and the choke drives a trigger electrode.

author: capt bullshot
author_rank: Super Contributor
timestamp: February 06, 2019, 11:10:20 am
content: The red and yellow components in you picture are capacitors.The blue one looks like an HV pulse generator transformer, as found in photo flashlights to trigger the xenon discharge tube.The small three-pin device most probably is a small thyristor or similar.So from the little information given, I'd guess this is some circuitry to trigger a discharge bulb by means of high voltage pulses.

author: Md Mubdiul Hasan
author_rank: Regular Contributor
timestamp: February 06, 2019, 07:26:39 pm
content: Nice feedbackDoes this circuit totally correct?High voltage pulses are generating from trigger tramsformer. Somehow oscillation is produced.Red capacitor is helping during negative half cycle of AC source. POTS and resistors are using for speed up or down the light bulb.

author: capt bullshot
author_rank: Super Contributor
timestamp: February 06, 2019, 07:46:16 pm
content: Something must be wrong with your circuit. I can't find a reasonable path of current to the lamp.Is this a strobe light as used in a discotheque?

author: james_s
author_rank: Super Contributor
timestamp: February 07, 2019, 01:45:19 am
content: It looks like the igniter for a HPS or pulse start MH lamp, however if that's the case there also needs to be a ballast choke.

author: Md Mubdiul Hasan
author_rank: Regular Contributor
timestamp: February 07, 2019, 10:59:08 pm
content: Quote from: capt bullshot on February 06, 2019, 07:46:16 pmI have found one in internet, that can give us clear idea what mistake is done here.Need to consider capacitor charging path through a resistor and discharging through triggering transformer.
Scullcom/Barbouri LTC2400 "Millivoltmeter" Software - Page 1
Forum section: electronics / general

author: WillTurner
author_rank: Regular Contributor
timestamp: December 15, 2018, 05:18:18 am
content: Many moons ago, Louis Scully ("Scullcom") started a LTC2400 based "millivoltmeter" project with a 0-40VDC input range. He produced a number of supporting videos describing the project, seehttp://www.scullcom.uk/millivolt-meter-mk2/. In May 2016, Greg "Barbouri" updated the project, and produced a nice boardhttps://www.barbouri.com/2016/05/26/millivolt-meter/which he made available through OSHParkhttps://oshpark.com/shared_projects/qgv0fpKN. The Scullcom/Barbouri design evolved into using a Caddock precision /10 resistive divider, AD8626 op amp front end, ADR4540B 4.096V reference, I2C LCD display, and Arduino Pro Mini host. There appear to have been few comments about the project here, but seehttps://www.eevblog.com/forum/metrology/7-5digit-diy-voltmeter/msg1390898/#msg1390898, and the following posts for a couple of comments.Earlier in the year, I decided to build up four boards. I had a friend that I knew could do an excellent job with the surface mount components, and an 80yo neighbour who still dabbles in electronics; so I promised them a board each for Christmas. The software for the project was pretty raw, and about six months ago I incorporated integer offset and gain calibration. I've been sitting on it since then, and have just pulled it out again to fulfill my Xmas promises. Although I can see much work remaining (both software, and hardware) the latest code is attached.

author: Doctorandus_P
author_rank: Super Contributor
timestamp: January 23, 2019, 01:15:10 pm
content: As an alternative, building this with an ADS1220 might be an interesting option to keep the price down.The ADS1220 has an internal voltage reference and PGA upto 128x.As a bonus you also get an integrated temperature sensor.
Unable to load firmware for popular TS100 and ES121 tools - Page 1
Forum section: electronics / general

author: kmpres
author_rank: Newbie
timestamp: May 04, 2019, 05:04:28 pm
content: Hi Guys,First post here. I have what sounds like an easy question but it took far too much time from my day today and I still have no answer. So, maybe you can help.I recently bought a new TS100 soldering iron and as ES121 electric screw driver from Banggood. They both work fine but I have been unable to load any firmware into them. All the websites I've tried (miniware.com.cn and several others) give "This site can't be reached" errors and the devices don't connect to my two computers despite engaging their config modes and using three different USB ports and three USB cables. Not even the little USB jingle comes up when the connector is plugged in. And yet both computers work fine with other devices, like my camcorder and bluetooth keyboards, and my internet connection is not restricted in any way that I am aware. One computer is a 10 year old desktop but has a fresh copy of Win 10 installed, the other is a new HP laptop with Win 10 installed. I do use a VPN but turning it off has had no effect. Getting tech support has also been ridiculous - as usual, nobody is manning the websites these days. Have any of you run into these difficulties?Thanks.

author: Gyro
author_rank: Super Contributor
timestamp: May 04, 2019, 06:47:19 pm
content: Welcome.I can't help you with the ES121 but on the TS100 you need to hold down the button closest to the tip while plugging in to get into USB mode. It should then show up as an external memory drive.

author: kmpres
author_rank: Newbie
timestamp: May 30, 2019, 03:19:11 pm
content: Sorry for the delay in getting back to you on this. Life intervention you know.Re: my problem, no matter what I do, Windows 10 will not acknowledge the presence of either my ES-121 screwdriver or my TS-100 soldering iron. As far as my computers go, they are dead products and no firmware exists for them. Two computers, three USB cables and all manner of pressed buttons before and after insertion were tried with the same result each time. I think some third party sites are accessible, but if my devices can't connect to my USB ports then any attempt to load firmware into them isn't possible. This includes the site listed in the instructions, miniware.com.cn, which keeps giving me "unable to connect" messages. Simply plugging the devices into my USB ports should have donesomething, but I getnothing. Have any of you seen this problem? What am I missing here?https://www.eevblog.com/forum/Smileys/default/bangheadonwall.gif
Suggestion for board for 3x linear encoder + 3x steppers - Page 1
Forum section: electronics / general

author: leftek
author_rank: Regular Contributor
timestamp: October 08, 2018, 11:54:28 am
content: Hello,I would like a board like raspberry for a project with following requirements:1. Run graphical Linux and C language programming2. Connection via HDMI or sVGI to monitor and keyboard3. Inputs form 3x linear TTL encoders (up to 2Mhz) simultaneously4. To control 3stepper simultaneouslyAs i have see the WiringPi on Raspberry, don't work GPIOs on 2Mhz.Can anybody suggest me any board? The board can be open hardware or not.

author: donotdespisethesnake
author_rank: Super Contributor
timestamp: October 10, 2018, 06:16:13 am
content: With such a specialise requirement, it's very unlikely such a board exists. Possibly the closest is Beaglebone with a motor control cape like Replicape.To get high-speed encoder inputs you will need to build some customised hardware and/or software.

author: leftek
author_rank: Regular Contributor
timestamp: October 11, 2018, 01:22:37 pm
content: Quote from: donotdespisethesnake on October 10, 2018, 06:16:13 amThank you. May i must direct to microcontroller for this project.

author: xyrtek
author_rank: Regular Contributor
timestamp: January 03, 2019, 05:21:30 am
content: Long time ago I designed exactly what you are looking for...well not exactly since it had ethercat, modbus TCP interfaces and more complex requirements. (Synchronized clocks, safety, etc)In the process I tested quiet a few development kits and eval boards.This link maybe outdated but will point you in the right direction.https://www.eevblog.com/forum/beginners/integrated-bipolar-stepper-motor-driver-with-external-mosfet-support/msg903310/#msg903310Also search around, there are a few commercial options.For the encoder, read my reference here.https://www.eevblog.com/forum/projects/20-bit-updown-counter-anything-more-elegant-than-a-bunch-of-cascaded-4516s/msg2079712/#msg2079712

author: Doctorandus_P
author_rank: Super Contributor
timestamp: January 27, 2019, 08:13:43 pm
content: Grbl has been ported to STM32F103, and this is out of the box made for controlling 3 stepper motors with G-code (RS-274), and this processor also has quadrature support in hardware on it's timers. It also has built in USB, 3x UsART and extra peripherals such as DMA to push more data around than the processor could do on it's own.I think Grbl uses the USB in CDC mode, but you will have to modifiy / add code for the quadrature encoders.STM32F103 does not have enough Uhmpf to run Linux on it's own, but it can easily be a "smart" peripheral to a linux board.

author: IconicPCB
author_rank: Super Contributor
timestamp: February 01, 2019, 01:22:28 am
content: Check outhttp://www.mesanet.com/They have a range of anythingIO cards that will suit Your needs.
REPRAP one of the Highlights of Open Source. - Page 1
Forum section: electronics / general

author: beanflying
author_rank: Super Contributor
timestamp: December 05, 2018, 11:43:01 pm
content: While this may not exactly belong in this section it deserves to be shown for what can come out of true open source projects offered back to all.Not just about the Tech but the Man and his thinking behind the project and then what he has made out of it and how so much more has been made by others. And no I am not meaning just $$$ either.Tom Sanladerer has just put up a great Video interview with Adrian Bowyer which is well worth a watch.https://reprap.org/wiki/RepRaphttps://youtu.be/VV0Tjwq7Uc0
Basic LM317-based CV/CC 15V+15V 1.5A split Lab PSU - Page 1
Forum section: electronics / general

author: fsr
author_rank: Regular Contributor
timestamp: November 30, 2018, 03:41:43 pm
content: This Lab PSU is from the following circuit that appeared on LM317's datasheet back in the day it still said "National Semiconductor" in there. I just made some little modifications and added a negative supply, so as to make full use of a 15+15 Vac 3A transformer i already got. So, this is the original circuit from the datasheet:Positive Side (from datasheet).pngJust don't believe on the claimed max voltage and current there. You would be making a room heater if you go to that values, and will need a serious redesign. Forced air heatsinking it's the first that comes to my mind. Probably a lot more changes required.Now, before i go further, let me say that i never really tested it, but it seems to work without any issues i could detect. Anyways, i promised i would show the project if anyone was interested, so there it is. Also, this is a simple project with just analog components and one-sided PCB's, that can even be made with the toner transfer method, so it could be an interesting project for beginners.I made the final version in three little boards, because of limitations in Eagle PCB (i used v6.5). Here are the schematics of every one of the 3 boards (of course, if you don't need the negative board, you don't need to build it, buy you're still going to need the -6v for the positive supply):B1 - Fixed Voltages SCH.pngB2 - Positive Reg SCH.pngB2 - Negative Reg SCH.pngThe power transistors are MJ15003 and MJ15004. Each of them must be mounted on a heatsink of 2,85 °C/W thermal resistance (or lower). I used mica washers and thermal grease. No fan needed if mounted on free air, but take notice that the power transistors have their metal cases connected directly to the collector (in fact, the case is the collector terminal), so... not a good idea to short those. Beware of nearby metals.The LM3x7's need a small heatsink also. I used a 10 °C/W heatsink, but the theory said you can go up to 25 °C/W.Well, i think that's all, but i built this like ages ago, so let me know if you need additional information, and check everything. I'll attach the datasheet from which i took this, the PDFs for the PCBs, and the Eagle 6.5 files.Regards

author: David Hess
author_rank: Super Contributor
timestamp: December 02, 2018, 01:05:54 am
content: It is a clever design which takes advantage of clamping the 301A via its compensation pin.It can be improved thermally by using the current sharing configuration shown below and mounting the 317 and power transistors on the same heat sink so that the 317's integrated thermal protection can also protect the transistors.