hybridfree/eevblog-posts huggingface dataset:
Open Hardware Moodlamp - Page 1
Forum section: electronics / general

author: dansku
author_rank: Regular Contributor
timestamp: January 09, 2015, 06:21:25 am
content: This is an old project that I want to share with you guys.I built this moodlamp many years ago (I should make a new version using smd components).This was my first real project, so no judgments on the quality of the schematics.Project board, schematics and code can be found on the project's github page:https://github.com/dansku/Open-Hardware-Mood-Lampand on my website:http://www.danielandrade.net/projects/open-hardware-moodlamp/

author: dwhatley
author_rank: Newbie
timestamp: February 16, 2015, 07:10:01 am
content: Looks nice! What sorts of things can it do?
Banana pi  - Page 1
Forum section: electronics / general

author: notzippy
author_rank: Regular Contributor
timestamp: January 28, 2015, 05:44:35 pm
content: Anyone tried one of these ? Was wondering if there is any opinion on themhttp://www.bananapi.com/Specifically on the router (BPi-R1) or camera (BPi-D1)..AFAIK they are not affiliated with raspberry piBanana Pi -A New Generation High-end Single-board ComputerBPI- R1 is a 300Mbps Wireless N RouterBPI-D1 is the smallest open-source development board around, with a built-in HD mini camerathanksNz

author: Frost
author_rank: Regular Contributor
timestamp: January 28, 2015, 11:36:06 pm
content: Quote from: notzippy on January 28, 2015, 05:44:35 pmYes, I use several of these as a test platform for my cluster setupsand as a backend system for my KNX installation.The Banana Systems provides a SATA Port and Gigabit Ethernetwhich is a little bit limited by the SoC, so I was able to reach~460MBit/s with a synthetic benchmark like iperf, jumbo framesare not supported.But I would not recomend to buy the Banana Pi, I would definitelygo for the successor, the Banano Pro, which is not much more expensive.The original LeMaker Kernel 3.4.103 is a little bit outdated today,especially if you look for new kernel functions like btrfs for example.But the upcomming kernel 3.19 will support the Banana Piand the Banana Pro.At the moment the dts file for the Pro is still missing at the latestkernel 3.19-rc6, so you had to integrate the file by yourselfinto the kernel sources, but maybe it will be included inthe final 3.19 version.

author: notzippy
author_rank: Regular Contributor
timestamp: February 02, 2015, 01:01:46 pm
content: How does the pro stack up against the new pi +?http://www.theregister.co.uk/2015/02/02/raspberry_pi_model_2/Nz

author: Frost
author_rank: Regular Contributor
timestamp: February 02, 2015, 06:36:38 pm
content: Similar single thread performace.But:+ little bit cheaper+ higher parallel performance, if all cores are fully utilized- No SATA Interface- Ethernet only 100MBit/s and only over USB, no integrated MAC
My Vmarker(interactive whiteboard) project is now open source!  - Page 1
Forum section: electronics / general

author: robint91
author_rank: Contributor
timestamp: January 31, 2015, 10:35:38 am
content: Hi all,As of today I have opened my vmarker project. It includes almost everything schematics, pcb and firmware. I have also include some datasheets of the fancy ir sensor we use. It is almost the same as the one in the WiiMote but this has decent documentation and better specs. There is also software and design of the pen we use, which uses a 38kHz IR coding to send gyroscope information.You can find more information onhttp://vmarker.org/en/opensourceSure to have a look in the hardware repo.I hope that you have something of it.

author: Laurynas
author_rank: Contributor
timestamp: February 02, 2015, 01:27:53 pm
content: nice project, I'm sure it will help a lot where commercial stuff is way out of budget.

author: artag
author_rank: Super Contributor
timestamp: February 09, 2015, 07:44:27 pm
content: Or where you want to view the board remotely.It appears that existing boards want to use a proprietary display program, or flash in a browser. This is pretty hopeless for modern discussions - it wants to be some standard that any browser can support and without flash, which is deprecated and no longer fully supported.SVG comes to mind but there may be something more appropriate.
yet another clock - kit? - Page 1
Forum section: electronics / general

author: djacobow
author_rank: Super Contributor
timestamp: October 14, 2014, 10:21:31 pm
content: I built a simple clock using a 16x16 matrix of LEDs, 74HC595s, an Atmega328, and a DS1307. The numbers change through animations by which they "swoop" in when they change.It also has a Conway's Game of Life mode, because you just have to do that sort of thing when you have a matrix of LEDs.Anyway, I was thinking that maybe someone would like something like this as an SMD practice kit. You get to solder a moderate pitch QFP, some SOICs, and of course a lot of 0805s, and you get a clock out of it.You think anybody would be interested in something like that? I know everyone and his brother has made a clock like this, but I thought this one came out pretty good. The "case" is just two pieces of acrylic sandwiching the board with M3 hardware.If I were to kit it up I'd spend some time cleaning it up; more time on fonts, remove extraneous features from the board (Spark Core socket), yadda yadda. Might switch to bigger LEDs. I do want to try my hand at selling something on the interwebs, but don't want to get stuck with parts for 50 of these.Oh, of course I'd open source the design, too.-- dave j

author: Laurynas
author_rank: Contributor
timestamp: October 20, 2014, 01:50:18 pm
content: While kit would be interesting, i think everyone has different design in their minds.So i think it won't get many requests unless it's a very basic design at low price point.The general open source schematic/software part may be a popular thing though.

author: djacobow
author_rank: Super Contributor
timestamp: October 22, 2014, 10:04:03 pm
content: Thanks. I may just post the schematic, gerbers, and code.

author: dansku
author_rank: Regular Contributor
timestamp: January 01, 2015, 01:37:41 am
content: Looking great!Do you have a video of the clock working?!Also this design would be perfect to build those clock that it lights up the text saying the clock.
arduino help - Page 1
Forum section: electronics / general

author: daniel123
author_rank: Regular Contributor
timestamp: December 16, 2014, 06:50:12 pm
content: Hello my name is Daniel. I I am trying to hook up multiple toggle switches to a Arduino Mega and Arduino Uno . If you can please send me easy to read photos not schematics that show where exactly to put the pins on each Arduino

author: rob77
author_rank: Super Contributor
timestamp: December 16, 2014, 07:09:01 pm
content: there is a thing out there called google... use it with the search phrase "arduino pinout"

author: Noise Floor
author_rank: Regular Contributor
timestamp: December 17, 2014, 03:28:37 am
content: I'd also recommend you check out a dedicated arduino community, I'd recommend:http://forum.arduino.cc/index.php

author: Stonent
author_rank: Super Contributor
timestamp: December 25, 2014, 07:41:01 am
content: Watch some of SciGuy14's videos on Youtube.
DSOXLAN - Page 1
Forum section: electronics / general

author: awallin
author_rank: Frequent Contributor
timestamp: December 18, 2014, 08:29:39 pm
content: Many thanks to user georges80 for sharing his DSOXLAN schematic and PCBI made my own and published the sources:https://github.com/aewallin/DSOXLANIf anyone wants to build this and has some comments/questions please ask below!AndersPS. hopefully in the next few weeks I can now explore how to 'set free' the capabilities I know my scope already has...

author: Scrts
author_rank: Frequent Contributor
timestamp: December 18, 2014, 10:08:35 pm
content: And maybe someone will 3D print the front panel for it?
Kidogo - OSHW low end digital signal generator - Page 1
Forum section: electronics / general

author: Murray
author_rank: Newbie
timestamp: November 21, 2014, 05:27:55 pm
content: I came across this and thought it might be of interest to some makers or hobbyists.Kidogo is an OSHW & SW 8 bit wide x 512 deep digital signal generator.1ms to 1s per time slot.It's not a high grade signal generator by any means, but I think it could be handy for some applications.Overview:http://www.element14.com/community/docs/DOC-43043/l/kidogo-8-channel-usb-digital-signal-injectorGitHub Repository:https://github.com/dilshan/KidogoAuthor's Page:http://elect.wikispaces.com/DownloadsEnjoy
Closed source hardware but open source firmware? - Page 1
Forum section: electronics / general

author: FennecTECH
author_rank: Contributor
timestamp: November 10, 2014, 06:45:53 am
content: Well im been a rockbox fan for a verry long time and ive recently gotten my most recent device im trying to calculte the disscharge rate for the rockbox firmware on my deviceanyways heres the generic discharge curve from the source code and i need to rebuild a new disscharge and charging curve for my device so i figured id ask hereill battery bench the device and attach the two curves it will take >48 hours to execute this operation because of the battery runtime of this device wich is more than 30 hourshere is the bit of code in questionhttp://git.rockbox.org/?p=rockbox.git;a=blob;f=firmware/target/arm/imx233/sansa-fuzeplus/powermgmt-fuzeplus.c;h=af87d7045d770f44cff3c79b57599d697f04332d;hb=HEAD
Wearable modular boards for flexible PCB mounting - Page 1
Forum section: electronics / general

author: fyberlabs
author_rank: Newbie
timestamp: August 25, 2014, 08:48:42 am
content: Hi, I have been working on some wearable concepts for a while now. A main component has been flexible PCB. To minimize traces and complexity, I have made several reusable modules and put them up onhttp://hackaday.io/project/2236-Flex-Modules. I am curious for input on the concept and if anyone would be interested in contributing or had ideas for more modules. I picked the STM32F401 as the main microcontroller and include an nRF51822 in the designs for Bluetooth or use by itself if you don't need an M4.
BLEasy - Revolutionary BLE Bridge For Arduino Shields - Page 1
Forum section: electronics / general

author: Grabo_Ideas
author_rank: Newbie
timestamp: October 04, 2014, 06:40:06 am
content: BLEasy. BLEasy is a Revolutionary, Easy-to-use and One-to-many BLE (Bluetooth Low Energy) bridge for your Arduino System.For the details, you may click on the following link for a preview:https://www.kickstarter.com/projects/grabo/930856984?token=f710ece1If you are interested in BLEasy, please don’t hesitate to support us on launch day. Every of your support is important for us.
CTLY, a low power time lapse camera - Page 1
Forum section: electronics / general

author: Artlav
author_rank: Frequent Contributor
timestamp: December 19, 2014, 11:13:13 pm
content: Project history:https://www.eevblog.com/forum/chat/a-winter-day-in-moscow-and-a-low-power-camera/Project site:http://orbides.1gb.ru/lapse_camera.php?lng=engSample video:Once upon a time a got a couple of $20 JPEG camera modules from ebay, and had no clue what to do with them.Long story short, it makes for a perfect (for my style) time lapse camera.The goal was to make a camera that would run for a year on a reasonable-sized battery at about 6 frames per hour.Camera: 640x480, video sample above.RTC (DS1338), with CR2032 battery backup.Writes to a microSD card, which also stores the config file where you select the frame rate and so on.Power is supplied from 4.8+ V, over a 3.3V LDO, so 4 alkalines is ideal. I thought of using a converter of some sort to increase efficiency, but it just isn't worth it on this scale.Total price: $30 or so, not counting batteries.One frame is:3 seconds at 100mA for the camera to stabilize and get a picture.7 seconds at 60mA to write the picture down.Between frames it is in deep sleep, taking 91 uA (YAY for Dave's uCurrent!)In other words, it uses 3.5-4 joules per picture.On 4 D cells that would be 50000 frames -at one frame every 10 minutes it will run for a year, at one per minute - for a month.The intent is to set it and leave it be, coming back once a year -longtime lapse videos.Get the schematics and layout here (Eagle):http://orbides.1gb.ru/tlc/camera_141219.zipAppearance of the latest version below.I'm still thinking about a good enclosure - it should stay moisture-free, but not necessarily opened with any regularity, so perhaps a simple waterproof box with a window.Well, what do you think?I kind of think the selling point is the run time and simplicity, but maybe it's nothing special, and lacking that the comparatively low picture quality sinks it?Schematics:

author: holko
author_rank: Contributor
timestamp: December 26, 2014, 01:46:57 am
content: I really like it!Would like some more info on the camera module (thinking of replication this project!)Is it an ordinary serial output JPEG camera with I2C?-holko

author: Artlav
author_rank: Frequent Contributor
timestamp: December 26, 2014, 08:42:17 am
content: Quote from: holko on December 26, 2014, 01:46:57 amIt is a serial JPEG output camera, no I2C in it.I.e.http://www.ebay.com/itm/TTL-Interface-Camera-Module-CF0706C-V3-JPEG-CVBS-MCU-UART-/181550946094Meanwhile, here is the thing assembled with batteries.Still thinking on what to make the enclosure for it from.
OSH Attribution? - Page 1
Forum section: electronics / general

author: helloworld922
author_rank: Regular Contributor
timestamp: February 06, 2013, 05:45:30 pm
content: I am currently working on a PSU design based on Dave's uSupply (in particular the single LDO regulation stage, really cool idea). The design is going to be released OSH as well, and I plan on attributing Dave in documentation and such.I am also considering placing attribution to Dave's uSupply on the board, but I don't want to give the impression that the design has direct endorsement/association from Dave. What are your guy's thoughts on how to properly properly recognize Dave's work on board? Should I not even do it and only leave attribution in external docs/schematics?As a side-note, I'm open to suggestions for what to name the project. A few details about the project:It's designed as a pure bench scope (no battery). It has similar output capabilities (0-~20V output, 0-1A). There are several technical changes made in the design (switching pre-reg is a buck converter, upped the microcontroller power, tweaked tons of values and component choices, etc.), but functionally as I said above it's very similar to the uSupply. The project was taken as an exercise to understand more about power supply design. I plan on releasing the analysis/simulation results as I finalize the reports for those who drool over the math and graphs

author: jancumps
author_rank: Unknown
timestamp: February 06, 2013, 07:04:11 pm
content: inspired by ....

author: EExtrom
author_rank: Contributor
timestamp: March 15, 2013, 06:01:39 pm
content: Hello helloword922!Is there a possibility for a sneak-peak on the PSU schematic?As for Dave's attribution ... what about his name OR some sort of EEVblog tag OR something similar on the pcb silk screen? ... he love stuff on the silk screen anyway!!!Looking forward for your PSU OSH release.

author: zapta
author_rank: Super Contributor
timestamp: June 12, 2014, 10:38:39 pm
content: For names I typically search idioms sites with key words (e.g. 'power').. My current project is power related so I called it Power Play. Since you want to attribute Dave, how about uDave? (he will not appreciate Higher Power)..
uCurrent Gold: offset + noise vs. original uCurrent - Page 1
Forum section: electronics / general

author: MysticPixel
author_rank: Newbie
timestamp: June 10, 2014, 08:07:54 pm
content: I was excited to receive my uCurrent Gold the other day, so I swapped it into my rig (kudos on using screw terminals w/wire holes for all inputs! I got sick of making little adapter doodads) ... but I'm finding some very strange results.First off, note that this is a direct swap - nothing else in the setup has changed, I took these two captures within minutes of each other and made sure not to disturb anything else (nearby wiring, potential noise sources, etc.) The leads into the uCurrent vs. uCurrent Gold are identical, I just unscrewed them from one and dropped the other in. I am sampling with a TI ADS1015 ADC eval board, with the inputs configured as differential to allow for high-side measurement.Range is 1mV/mA. ADC settings are identical. See attachment for the differences (note that the vertical scaling on the second graph is 2x that on the first, so the differences are even larger than they appear)In short:* original uCurrent has minimal DC offset, noise under 1mV* gold uCurrent has -4mV offset and is really noisy, it jumps back to 0mV. These peaks are repeatable across tests and occur just under 40 per second.I'm not ruling anything out at this point but I wanted to post here and see if anyone else had some experience with comparisons between the two.

author: theatrus
author_rank: Frequent Contributor
timestamp: June 11, 2014, 04:42:40 am
content: The Gold does have significantly higher bandwidth, which can account for the higher "noise" (depending on your load)

author: EEVblog
author_rank: Unknown
timestamp: June 11, 2014, 08:41:56 am
content: Quote from: theatrus on June 11, 2014, 04:42:40 amThat is likely it. We are talking 100x the bandwidth here.The output offset though, I don't know what's going on there. I have never seen one that was out of spec.This is a typical offset/noise distribution graph
DIY Lead Acid Battery tester/logger - Page 1
Forum section: electronics / general

author: Mosaic
author_rank: Regular Contributor
timestamp: May 21, 2014, 01:00:10 am
content: Hi All:I have developed an automated Lead acid , Amp Hour load tester & logger with an auto shutdown and charger enable. It is a DIY kit that is published at ClubJameco.com for those who prefer getting a professional PCB to work with or don't have a junk box of parts handy.For the rest of us who like to make PCBs from scratch, scrounging for parts etc. , I post all the necessary files and docs here for your convenience.The project runs on a 16F PIC and has calibration procedures to account for connection losses. I have found that it's quite accurate and I use it a lot. Great for checking those smaller solar backup batteries, your wife's car batt. before the cold sets in, or those pesky 'die when u need 5 more seconds'7Ah PC UPS gel cells!Please enjoy!It has saved me oodles of time ( & battery $$$) which makesUncle Bobhappy!I'd be happy to improve it as per suggestions! (Knock, Knock, Dave u there?)

author: Mosaic
author_rank: Regular Contributor
timestamp: May 23, 2014, 05:07:41 pm
content: BTW:The archive includes the EAGLECAD files, the hex code for the PIC and full PDF documentation - build instructions and how it works. There is also an EXCEL file detailing the BOM and demonstrating how to use the uploaded data log to graph the battery discharge. An actual discharge graph is attached.The 2 digit LED gives the folllowing info:1) a 4 -digit voltage for calibration , eg. 12.742) a 2 digit single decimal value of the selected current load in Amps.3) The cumulative Ah discharged as the process continues, flashing the final result.4) 'Hi' if the AH exceeds 99 ( the datalog can go to 127Ah)5) 'Lo' when the battery is undercharged - no discharge test will occur.6) An 'UP' when ready to upload to the PC via a TTL rs232/USB cable.
NGen - A low cost programmable four channel engine speed simulator - Page 1
Forum section: electronics / general

author: 0xdeadbeef
author_rank: Super Contributor
timestamp: April 18, 2014, 05:38:39 pm
content: It's bit of "special interest" and the hardware part is not too exciting, yet it's what I worked on for the last two years (with major gaps of course) or so in my spare time.http://lemmini.de/NGen/NGen.htmlToday I finally pushed everything in the repository, so I can hopefully continue with something else soonhttps://bitbucket.org/fade0ff/ngen

author: Unknown
author_rank: Unknown
timestamp: April 18, 2014, 06:28:11 pm
content: Looks like an very interesting project! At the moment I'm actually working on a mini ECU reader of the various sensors etc but the RPM signal is from a VR sensor rather than a hall sensor; but I can completely understand why you made this! whilst working on my project I wished I had a complete engine simulation board as it would make the whole job a lot easier! ;-)

author: 0xdeadbeef
author_rank: Super Contributor
timestamp: April 18, 2014, 06:47:39 pm
content: Like 10 years ago or so, I also worked on engine control units with inductive crank sensors. It's however not so difficult to get that kind of signal from a 5V signal. Yo don't actually need the sine form, just the shape of the gap has to be adapted (symmetric transition in the gap) and you need a bipolar signal. When I was lazy, I just used a max232 to convert the (inverted) 5V signal to a +/-9V volt signal.
Information on voltage controlled amplifier - Page 1
Forum section: electronics / general

author: vaualbus
author_rank: Frequent Contributor
timestamp: November 25, 2013, 05:56:27 pm
content: In relation to my old post about the project of making a fully digital function generator withoth using a digital signal sysntetizer chip (I can't use it because I don't want smd component), I have solved the problem of the VCO and the waves generation. Now I have the folowwing problem how I make a amplifier that control the amplitude based on a given voltages( via the dac control by the microprocessor)?Any one have some ideas?By the wave the frequency range that the vco use if 1Hz to 1Mhz.Best regards, Alberto.

author: Marco
author_rank: Super Contributor
timestamp: November 25, 2013, 06:40:55 pm
content: How linear does it have to be? Would a JFET based VCA like this do :http://electronicdesign.com/analog/op-amp-and-two-jfets-form-voltage-controlled-amplifier

author: sub
author_rank: Regular Contributor
timestamp: November 28, 2013, 09:52:58 pm
content: You could use a multiplying dac, e.g. DAC8043A. This comes in DIP.

author: Rerouter
author_rank: Super Contributor
timestamp: January 31, 2014, 01:39:56 am
content: Though it looks less professional, you can use an AD9850 module or similar if you want to avoid SMD, its cheaper than the chip itself and is presented in a dip like package (little board with 2 pin rows,)
A very technical promblem on the log shaper circuit - Page 1
Forum section: electronics / general

author: vaualbus
author_rank: Frequent Contributor
timestamp: December 21, 2013, 10:59:47 pm
content: In realation to my function generator project I've found this usefull document:http://www-inst.eecs.berkeley.edu/~ee100/su06/lab/lab10-ProjectFinish/TheDifferentialPairAsTriangleSineWaveConverter.pdfwhere it is explained how to use and design the log shaper, metioned in the AN-263 document:http://www.ti.com/lit/an/snoa665c/snoa665c.pdfThis circuit is used to transform a triangle waveform into a sine wave.Altough the equations are almost easy I don't get how to find the Vt paramater.Any body can understand how to optained that paramater.For transistors I'm using a LM394 supermatched transistor paired.My input triangle wave havw Vpp of 10V on frequency range from 1hz to 1Mhz.Any body have some else ideas to convert the triangle wave into sine wave.How you optaine q, T (I think this is the ambient temperature) and k metioned on the definition of Vt. (Vt = (kT)/q)I've seen circuits using the old style and opsolate AD639 circuit but I want to not use it (24$ on ebay).Best regards, Alberto.PS:Happy Christmas and happy new year to everybody.

author: SeanB
author_rank: Super Contributor
timestamp: December 22, 2013, 11:21:33 am
content: Please note. First link will not load, trailing comma in URL. Second a trailing period.

author: vaualbus
author_rank: Frequent Contributor
timestamp: December 22, 2013, 12:18:54 pm
content: now the link work, I've done a stupid error.

author: vaualbus
author_rank: Frequent Contributor
timestamp: December 24, 2013, 06:34:50 pm
content: I found waht paramaters are:k -> Boltzaman constantq -> Electron ConstantT -> Like I suspect is the temperature.

author: mrflibble
author_rank: Super Contributor
timestamp: December 25, 2013, 02:49:56 am
content: Quote from: vaualbus on December 24, 2013, 06:34:50 pmGiven your original post ... note that T is the absolute temperature inKelvin.

author: vaualbus
author_rank: Frequent Contributor
timestamp: December 27, 2013, 04:37:57 pm
content: Of course.

author: Icarus
author_rank: Regular Contributor
timestamp: December 31, 2013, 09:13:48 pm
content: The key is that the input voltage of log shaper must be lower 100mv (or 500mV something like that) reference to virtual ground. So we can put bjts in exponential region.http://www.ti.com/lit/an/snoa665c/snoa665c.pdfLook at figure 14.LM311, LF356 and all those clamping diodes are just a triangle gen.Wave-Shape Trim-pot and 200 ohm resistor network form up an attenuator
OSHW pic18f4550 based arduino - Page 1
Forum section: electronics / general

author: SixD
author_rank: Contributor
timestamp: December 15, 2013, 06:19:14 pm
content: I was planning to do pic18f4550 based arduino. i have tested pinguino but i don't get it to work.

author: westfw
author_rank: Super Contributor
timestamp: December 15, 2013, 11:58:59 pm
content: See "USB Bit Whacker"But it might be easier to figure out what went wrong with your pinguino...

author: SixD
author_rank: Contributor
timestamp: December 16, 2013, 06:44:01 pm
content: I checked it out but it was for pic18f2550. The pic18f4550 has more I/O.

author: adam1213
author_rank: Regular Contributor
timestamp: December 16, 2013, 10:15:28 pm
content: Quote from: SixD on December 15, 2013, 06:19:14 pmWhat doesn't work? e.g.You can't install the softwareThe software does not compileAfter programming the bootloader on to the device you can't program the deviceYou can compile programs and program the device through the bootloader however the programs do not run as expectedQuote from: SixD on December 16, 2013, 06:44:01 pmThe pic18f2550 and pic18f4550 share the same datasheet and are BOTH supported by pinguino. e.g.http://wiki.pinguino.cc/index.php/PIC18F4550_Pinguino

author: SixD
author_rank: Contributor
timestamp: December 16, 2013, 11:15:19 pm
content: The problem with pinguino is that I can't upload software to the board via pinguino ide.

author: adam1213
author_rank: Regular Contributor
timestamp: December 16, 2013, 11:21:11 pm
content: Have you programmed the pic18f4550 with the pinguino bootloader?

author: SixD
author_rank: Contributor
timestamp: December 16, 2013, 11:36:53 pm
content: Yes, I did program the bootloader.

author: westfw
author_rank: Super Contributor
timestamp: December 17, 2013, 06:33:23 am
content: QuoteIt apparently also works for the 4550, although the DIP board didn't get to production:http://www.schmalzhaus.com/UBW/Images/UBW40DIPv1.jpg

author: poorchava
author_rank: Super Contributor
timestamp: December 17, 2013, 07:20:37 am
content: Don't create another -duino. There's enough of them.

author: filip_cro
author_rank: Regular Contributor
timestamp: December 17, 2013, 03:36:06 pm
content: Just put empty PIC and another uC to act as SPI programer. Much easier to do and you wont use more memory than is needed.

author: u271D
author_rank: Contributor
timestamp: December 23, 2013, 04:01:06 pm
content: I built a Chipino, it doesn't have USB though.http://www.chipino.com/
Circuit / Schematic Collection? - Page 1
Forum section: electronics / general

author: sbehnke
author_rank: Contributor
timestamp: April 07, 2013, 04:09:08 am
content: Is there a good place to go to see a collection of circuits and schematics of open source hardware? I've seen them scattered here and there but it would be nice to have a collection of them that I could look though and learn from.Thanks,Steven

author: mrflibble
author_rank: Super Contributor
timestamp: April 07, 2013, 05:28:38 pm
content: Quote from: sbehnke on April 07, 2013, 04:09:08 amGiven your interest in the matter you could always use this thread as a placeholder, and paste links you find as you go along. Someone has to start.

author: FJV
author_rank: Regular Contributor
timestamp: April 19, 2013, 04:21:31 pm
content: http://www.talkingelectronics.com/projects/200TrCcts/200TrCcts.html

author: roach969
author_rank: Newbie
timestamp: October 21, 2013, 11:05:03 pm
content: There are some great and simple projects in this eBook, beginner friendly! Thanks for posting, I'll post whatever I put together.

author: johnnyfp
author_rank: Frequent Contributor
timestamp: October 24, 2013, 03:57:18 am
content: There's always my site to upload schematics and circuit stuff?sharedcircuits.com. You can start projects, upload them and share them with the world. It even parses Gerber files into layers so that you can view PCB's online.

author: Rory
author_rank: Frequent Contributor
timestamp: October 24, 2013, 04:49:52 am
content: I wonder if archive.org would be a good place to put this kind of stuff. You're pretty much assured that it won't go away like a site run by an individual could.

author: mrflibble
author_rank: Super Contributor
timestamp: October 24, 2013, 05:15:20 am
content: Hosting is fairly trivial. Putting together a good collection + useful descriptions is where the work is at.

author: apelly
author_rank: Unknown
timestamp: October 24, 2013, 06:03:21 am
content: A lot of stuff gets posted to github, but it's not the best tool for this sort of thing.

author: backflipper
author_rank: Contributor
timestamp: November 07, 2013, 08:15:04 pm
content: Quote from: FJV on April 19, 2013, 04:21:31 pmTalking electronics!I used to buy FM bugs from Colin back in 92!Top bloke!

author: backflipper
author_rank: Contributor
timestamp: November 07, 2013, 08:19:40 pm
content: I use to buy the elektor books back in the 90s:http://www.elektor.com/products/books/electronics/en-311-circuits.1969327.lynkxI have 2 or 3 of them in paperback but they offer them as ebooks now.
need to identify wire type - Page 1
Forum section: electronics / general

author: jtronix
author_rank: Regular Contributor
timestamp: June 16, 2013, 06:47:05 am
content: please help me to identify type of wire???this type of wire is use for connecting two pcb's.please help ...

author: branadic
author_rank: Super Contributor
timestamp: June 16, 2013, 07:50:59 am
content: What part of your post is open source hardware?

author: Legit-Design
author_rank: Frequent Contributor
timestamp: June 16, 2013, 08:12:20 am
content: Looks like some sort ofRibbon cable. I counted 25 individual strands. Also the pin pitch is important, that means distance between the pins of the cable. I would use just any old flat cable with same pin pitch.If I'd have to guess I would take old IDE hard drive cable and fabricate one. If the pitch needs to be higher wires can be separated to achieve correctness.

author: jtronix
author_rank: Regular Contributor
timestamp: June 16, 2013, 08:26:14 am
content: thank you for reply.i just want name of this wire cable. this is not ribbon cable.you can see this type of cable in automotive grade pcb where this is used for connect two PCB.please give type of this wire pitch and size does not matter.

author: Jon Chandler
author_rank: Frequent Contributor
timestamp: June 16, 2013, 09:01:05 am
content: It's a flat flex cable. There are a variety of terminations available.

author: jtronix
author_rank: Regular Contributor
timestamp: June 16, 2013, 09:05:05 am
content: this is pcb solder cable. this cable doesn't have any solder pad like FFC have.

author: baljemmett
author_rank: Unknown
timestamp: June 16, 2013, 10:42:16 pm
content: Looks like something akin to a Tyco Flexstrip jumper -- a sore point with me at the moment, because I typoed a part number last week and ordered one with the wrong pin pitch!Seehttp://www.te.com/catalog/minf/en/161?BML=10576,17787for the Tyco version, but no doubt other manufacturers have similar. I seem to be struggling to get their product selector to find the part I'm looking for as an example, but there's a reference guide at that URL which describes the options.The important variables are the length, pin pitch and conductor count, so try a part number like FSN-12A-25 (FS=Flexstrip, N=Nomex insulation, 1=1.27mm pitch, 2=2 inches long, A=straight pins, 25=25 conductors) as a starting point and adjust from there if required.

author: zapta
author_rank: Super Contributor
timestamp: September 30, 2013, 04:57:43 pm
content: Quote from: branadic on June 16, 2013, 07:50:59 amThe question marks.

author: Stonent
author_rank: Super Contributor
timestamp: October 22, 2013, 07:40:48 am
content: Electric blanket.
Open Source 4K Cinema Camera - Page 1
Forum section: electronics / general

author: Mike Warren
author_rank: Unknown
timestamp: October 08, 2013, 12:08:24 pm
content: http://www.redsharknews.com/technology/item/1123-this-could-be-the-biggest-advance-in-camera-design-for-a-decadeI'd love to see this come to fruition, but it seems to me to be too big a project for the potential user base.Also, half decent lenses tend to cost more than the camera bodies, and I can't see that being able to be done under the OSH model.

author: mikeselectricstuff
author_rank: Super Contributor
timestamp: October 08, 2013, 02:31:28 pm
content: Seems thay are more interested in openness for flexibility rather than cost etc.If they can buy the sensors I see no reason this isn't entirely doable - everything else can be done with off-the-shelf parts and some mechanical bits.

author: madshaman
author_rank: Frequent Contributor
timestamp: October 08, 2013, 03:10:40 pm
content: Maybe there's some enormous community of DIY lens grinding enthusiasts lurking about?

author: krenzo
author_rank: Regular Contributor
timestamp: October 08, 2013, 05:12:03 pm
content: Here's the web site for the project:https://www.apertus.org/This is very exciting!

author: madshaman
author_rank: Frequent Contributor
timestamp: October 08, 2013, 07:00:03 pm
content: That's so totally sick.

author: cloudscapes
author_rank: Regular Contributor
timestamp: October 08, 2013, 09:17:31 pm
content: Very cool! Wonder how big the sensor is.Looks APS-ish. I think it might be this one:http://www.cmosis.com/news/press_releases/towerjazz_and_cmosis_announce_ramp_to_volume_production_for_cmosis_12_megan
Makerbot Firmware - Page 1
Forum section: electronics / general

author: PeterM
author_rank: Newbie
timestamp: August 04, 2013, 12:59:18 am
content: HelloFunny, watching EEVblog #500 where Dave is complaining about not been ableto re-program the Atmel micro!. Since I am a Atmel user, I admit Avr Studio is bloated butnevertheless reading a HEX file should not be a problem.My opinion is, the only reason this issue is occuring with the HEX fileis because the file is:1) File is corrupt2) Is not standard HEX file, it's in a different format.I don't know which model Makerbot you have, I was going to find the firmware andtry it myself to see if I get the same error (I don't own a Makerbot).Peter

author: c4757p
author_rank: Super Contributor
timestamp: August 04, 2013, 01:07:54 am
content: There's a thread on this already, Dave failed at Github and downloaded an HTML file thinking it was HEX

author: Stonent
author_rank: Super Contributor
timestamp: August 04, 2013, 05:50:03 am
content: Ya know, it's basic for me but I do IT work for a living. I might laugh at this situation but Dave could run 1000 circles around me when it comes to anything electronics.

author: c4757p
author_rank: Super Contributor
timestamp: August 04, 2013, 06:14:20 am
content: I know, I was just kidding! He was kind of pissed about it...

author: EEVblog
author_rank: Unknown
timestamp: August 04, 2013, 10:13:33 am
content: Quote from: c4757p on August 04, 2013, 01:07:54 amApparently a very common mistake it seems.Also, the Atmel software did NOT help by saying it was corrupted or invalid file, instead it said it was an incompatible hex format.

author: PeterM
author_rank: Newbie
timestamp: August 04, 2013, 11:27:15 am
content: Ohh, sorry if I posted in the wrong place, I did do a search but I did not find any other links, obviouslyI used the wrong wording during my search (I used Makerbot in the search).QuoteUnfutunately it can only look and check for the correct formating in the Hex file to give the end user a pass or fail message.(they are not going to analyse the the file in detail to give the user an exact error message).Oh well it's good it got sorted :-)Peter
Arduino Uno R3 with MSO-19 Scope - Page 1
Forum section: electronics / general

author: oldy99
author_rank: Newbie
timestamp: September 26, 2013, 04:33:05 am
content: I have the Arduino plugged into a USB socket on my Acer Aspire netbook and the MSO-19 into an adjacent USB socket. Before connecting the probe ground to the Arduino Gnd, I measured the voltage from probe ground and Arduino Gnd and noted that the MSO-19 ground was about 0.3 volts more positive than Arduino Gnd. I suspect it has something to do with how gnd and ugnd are treated in USB circuits. In the Arduino there is device between ugnd and gnd whose symbol looks like 2 half moons back to back. Don't know what that is. I also don't know what the USB circuit that Link Instruments use in their MSO-19 looks like that would account for this difference. Can someone out there help me understand what is going on? I feel quesy about connecting 2 points of different voltage together.
Consistent panel placement techniques wanted. - Page 1
Forum section: electronics / general

author: asgard
author_rank: Regular Contributor
timestamp: April 03, 2013, 10:26:36 pm
content: [I have moved this discussion here, as it seems more appropriate]I have been playing panellize dominoes with the four components of the current project. Each component is a board with different dimensions. With a bit of fiddling around I can get 5 complete kits of boards on a single 7.8 x 10 panel. That is by only using Eagle and Gerbmerge. All well and good, but Gerbmerge doesn't automagicallty do anything with breakoff tabs, so I probably have to do it with v-scoring, followed by hand-edits of the score Gerber file. I do not have the capability to graphically edit Gerber files, so that process of eliminating unnecessary score liknes is probably going to be funky and slow. In addition, there is a nifty ULP for Eagle that prepares a centroid placement file in .csv form. One problem is that there needs to be some way of expanding the centroids to accommodate multiple placements on a panel, in varying rotations. I have developed a manual process using the placement list from Gerbmerge, combined with the centroid ULP output, within a spreadsheet, to do that, but it takes multiple days just to do the 20-board panel of the current project. Just imagine the brain pain that would result from doing a 273-board panel for just the .5x.5 Powah's That sounds like a job for a computer, eh? That results in just a list of component ID's, X and Y offsets, and rotation angles for the pick-and-place machine. I have started to look around at various assembly house web sites for technical requirements, but they do not seem to be consistent whether they can take individual board centroids and BOM's and do the placement themselves, or if I have to do the placement myself, with an expanded BOM to take in the entire panel.On another note, I have adapted a project from last year's Elektor project issue into a much better packaging and layout, while keeping the previous circuit. I wanted to build a few of these to give away as Christmas and birthday gifts this year, but it seems like a pretty nifty thing that other people can use. My boggle is that would it be legal for me to commercialize the design, because I got the original circuit schematic from a magazine article, but everything else (board, BOM, packaging) was designed by me? Probably can't get a definitive answer except from the publisher (which is dicey), but I was curious if anybody else (Dave, DP, Seeed, Sparkfun) have previously been through that particular mill. FYI the project is a gimmick you can put on the table near at hand in your living room, which can toggle the mute or power for the TV by simply rapping on the table.
Powah-1 and Powah-2 - Page 1
Forum section: electronics / general

author: asgard
author_rank: Regular Contributor
timestamp: March 19, 2013, 10:23:30 pm
content: Here is a pretty simple pair of circuits. The first one I call Powah-1. As can be seen in the photos it is only about 0.5"x0.5". This is a soft-switch on-off toggle. Powah-1 can directly switch up to CMOS logic levels. The difference in Powah-2 is that because of the protection barrier diode the logic is powered at 5.1V even though the PFET can switch 18V quite adequately. The current draw on both devices at quiescent is at the measurability limit of my cheap B&K multimeter. The other difference between Powah-1 and Powah-2 is the on-press of the button can be quite brief, while the off-press requires a full 3-second press to turn off the circuit.The Powah-2 fits on a 0.8"x0.5" board.If the pins are not connected the little boards can be mounted in various places and used as limit sensors for motion control, etc.I did the materials costing and calculate (with the typical 4x materials cost value) the Powah-1 at $5.95, and the Powah-2 at $13.95.Obviously for a power toggle a mechanical switch can be used, but a debounce circuit adjunct would require nearly the same amount of additional logic and cost.Just thought I should throw it out here for your edification.J.R.
Loochi - the open source connected lamp - Page 1
Forum section: electronics / general

author: sarfata
author_rank: Contributor
timestamp: December 04, 2012, 08:01:19 pm
content: Hi everyone,I have been working for a while on an open-source connected lamp. It is available today onwww.getloochi.com(crowdfunding).Loochi is based on a 10W RGB led from Ledengin. The current control is done through an AtTiny861 micro-controller with the very fast PWM (64Mhz resolution / 250kHz). The lamp is controlled from an iPhone or iPad through a Bluetooth Low Energy module which has the huge advantage of requiring absolutely no configuration.The Bluetooth module simply transmits the commands it receives over an SPI bus to the ATTiny who controls the LED. The most basic command is three bytes to control Red, Green and Blue.The electronic is open-source, and so is the software and the plastic design. Loochi is a great way to experiment with connected objects, Bluetooth Low Energy and high-power RGB leds.You can find the source on github.com/tbideas and some instructions on our blog (tbideas.com/blog). All the basic elements are there but we still need to write more doc. In the meantime, if you are have any questions, or if you would like to know more on any subject, please let me know!If you do not want to build your own, we are launching a crowdfunding campaign to build ~750 of those. It is on indiegogo:www.getloochi.com. You will get the shade, the base (injection-molded), the PCB and a heatsink, all fitted together and ready for you to hack away! You could for example easily replace the electronic to use another communication protocol - or design a different shade and 3d-print it.I would like to give a big thank you to Dave, Chris Gammell and the entire eevblog community. This project would have never been possible without the help and motivation we found in this forum, the youtube channel and the amp hour every week!Please - do give feedback!cheers!thomas

author: Unknown
author_rank: Unknown
timestamp: December 04, 2012, 08:27:28 pm
content: Looks really nice. Would make an excellent present.

author: sarfata
author_rank: Contributor
timestamp: April 30, 2013, 08:01:13 pm
content: Hi!I have posted a complete description of the project, how it works, how to assemble your own on the Elektor Labs website:http://www.elektor-projects.com/project/loochi-a-bluetooth-low-energy-connected-lamp.13128.htmlTopics covered:* Software (avr) buck converter for current regulation* 10W RGB LEDs soldering* Bluetooth Low Energy with the Bluegiga BLE112 module* And more!Let me know what you think! Ideas for improvement are most welcomed!cheers,thomas
Fluke 179 worth it? - Page 1
Forum section: electronics / general

author: doomster
author_rank: Newbie
timestamp: March 10, 2013, 07:13:34 pm
content: hello everyone,this is my first postI am dimitris. i work in IT Support Buisness . as an extra im running a home bench buisness repairing industrial equipment,gathering a small extra income. My kid recently destroyed an old mastech multimeter i had on my bench.I saw an Fluke 179 DMM for 200euros (about 250$) on a local store. I need a bit more accuracy than the mastech |(i checked mastech's accuracy recently using a hammeg olliscope to doublecheck the measurements, and i was a bit dissapointed ) , and i think i would like Hz and Temp measurements as well.Does it worth the money? is it a good investment for my bench ?Thank you in advanceEDIT: Lol 1st post and on a wrong categoryPlz mods move it to Test Equipmentsorry for the inconvinience

author: retiredcaps
author_rank: Super Contributor
timestamp: March 10, 2013, 10:13:43 pm
content: Quote from: doomster on March 10, 2013, 07:13:34 pmI don't know the local currency and all the VAT taxes, but an used 179 on ebay costs around $125 to $150 USD. A new one on Amazon.com is $258 USD.

author: rsjsouza
author_rank: Super Contributor
timestamp: March 11, 2013, 12:56:24 am
content: I have a 179 and I can say it is a war tank and it has a great responsiveness in its auto-range. Since you are interested in repairing industrial equipment, safety is also a concern and you can't go wrong with it.Checkheresome internal photos I took a while ago and, if you scroll down you can check the excellent reviews from Martin J Lorton.Last year when I was in the market for a replacement for my 25 year-old DMM (which I blew in a silly accident), at first I thought that Fluke was very expensive for its specs when compared to other brands (Extech, BK Precision, etc.). However, my reason to go for the Fluke brand (and the 179 in particular) was that, if it lasts for another 25 years, then it definitely paid itself off...

author: WBB
author_rank: Regular Contributor
timestamp: March 11, 2013, 01:34:22 am
content: Quote from: doomster on March 10, 2013, 07:13:34 pmChances are that your DMM is more accurate than the o'scope. Nothing wrong with upgrading to a better or a 2nd DMM for sure, but don't just assume the scope is correct and the DMM is wrong. Absolute accuracy of an o'scope, even a good one, isn't that great.

author: doomster
author_rank: Newbie
timestamp: March 11, 2013, 05:13:38 pm
content: wellim gonna go for it. thank you all, and i will come up with my review when i get it
Getting the word out - Where to announce OSH projects? - Page 1
Forum section: electronics / general

author: Pat Pending
author_rank: Regular Contributor
timestamp: September 20, 2012, 11:37:57 pm
content: On here for one, but where else to announce OSH projects?Is there one main OSH site that catalogs where stuff can be found, other than Google.

author: EEVblog
author_rank: Unknown
timestamp: September 20, 2012, 11:41:36 pm
content: There is no central site.The usual approach is to publish it on your own blog and then try and get some of the bigger blogs to pick it up.e.g. Adafruit, Hack-A-Day etcDave.

author: Pat Pending
author_rank: Regular Contributor
timestamp: September 20, 2012, 11:51:05 pm
content: http://freedomdefined.org/OSHWThis is the closest I've found - basically just a list of OSH license endorsements.Sometimes there's a project at the end of the link, sometimes not.

author: Pat Pending
author_rank: Regular Contributor
timestamp: September 21, 2012, 12:26:40 am
content: Eventually found ithttp://wiki.openhardware.org/Catalog

author: Teemo
author_rank: Regular Contributor
timestamp: January 10, 2013, 01:41:14 am
content: I'm wandering why the Pat Pending searches for open hardware projects? The name and the interest do not match up at all.