not work - Page 1
Forum section: electronics / projects

author: Aigars
author_rank: Regular Contributor
timestamp: May 26, 2014, 07:49:55 pm
content: hi guys, maby u undertend, whats can be wrong.

author: tom66
author_rank: Super Contributor
timestamp: May 26, 2014, 07:52:24 pm
content: You have several solder bridges on the board, I am not sure if they are intentional.

author: Thor-Arne
author_rank: Unknown
timestamp: May 26, 2014, 08:23:02 pm
content: Perhaps a contrast trimmer for the LCD ?

author: 128er
author_rank: Regular Contributor
timestamp: May 26, 2014, 08:34:38 pm
content: Quote from: Thor-Arne on May 26, 2014, 08:23:02 pmAt first glance i would guess the same. Make the contrast voltage adjustable. Seems like you have fixed the contrast voltage with a divider? What voltage is on (i guess) pin 3?Schematic would also be good and code from the atmel controller.

author: Balaur
author_rank: Unknown
timestamp: May 26, 2014, 08:41:27 pm
content: Quote from: 128er on May 26, 2014, 08:34:38 pmIt looks to be a version of theAVR Component Tester. Maybethis one.

author: Neganur
author_rank: Unknown
timestamp: May 26, 2014, 09:13:28 pm
content: bit hard to tell but I think most of what looks like solder bridges is actually glare from the left-over flux. I'd look into a contrast trimmer too, caught myself forgetting it a couple of times

author: Mr Simpleton
author_rank: Unknown
timestamp: May 26, 2014, 09:21:04 pm
content: What about ground... I fail to see how the groundplane in lower left is connected to the other ground??

author: Balaur
author_rank: Unknown
timestamp: May 26, 2014, 09:31:03 pm
content: Quote from: Mr Simpleton on May 26, 2014, 09:21:04 pmIt looks to be connected on the left switch side (and through the switch itself)

author: TerraHertz
author_rank: Super Contributor
timestamp: May 27, 2014, 01:10:45 am
content: Quote from: Mr Simpleton on May 26, 2014, 09:21:04 pmThis. No, they're not bridged by the pushbutton.Also, the two small diodes - what happened to them? Using thin leads as scope probe clip points is not a good idea.Anyway they both have mangled leads, perhaps they are fractured?Edit: Oh wait. Are those actually surface mount resistors with wires soldered to them?

author: TVman
author_rank: Frequent Contributor
timestamp: May 27, 2014, 01:17:07 am
content: Quote from: TerraHertz on May 27, 2014, 01:10:45 amYes,Yes they are...

author: ajb
author_rank: Super Contributor
timestamp: May 27, 2014, 02:50:47 am
content: I'm not seeing any breaks in the ground plane. The area on the lower left that appears at first glance to be isolated looks to be connected by a single thermal track on one of the TO-92 pads.There are a number of HD44780 libraries for the AVR that don't have proper initialization sequences, and may or may not properly reset any given LCD controller.

author: Aigars
author_rank: Regular Contributor
timestamp: May 28, 2014, 10:38:26 am
content: there its sam mor

author: Neganur
author_rank: Unknown
timestamp: May 28, 2014, 11:10:17 am
content: You need to look into using a contrast potentiometer.That static voltage divider is doing you no good unless you know exactly what value you need for your specific display.Þú þarft að líta inn með andstæða potentiometer.Truflanir spennu Divider er að gera þér ekki gott nema þú vitir nákvæmlega hvaða gildi þú þarft fyrir display.

author: Unknown
author_rank: Unknown
timestamp: May 28, 2014, 11:14:56 am
content: Quote from: 128er on May 26, 2014, 08:34:38 pmQuote from: Neganur on May 28, 2014, 11:10:17 am4th'ing this. I've got a bunch ofverysimilar looking displays from DX that areverypicky about the contrast voltage, and the up/down viewing angle is terrible at best. Unless the contrast is adjusted spot on, they're unreadable.

author: Aigars
author_rank: Regular Contributor
timestamp: May 28, 2014, 11:44:58 am
content: hmm, and how i can fix this?

author: Aigars
author_rank: Regular Contributor
timestamp: May 28, 2014, 11:47:23 am
content: Quote from: Aigars on May 28, 2014, 11:44:58 amits a 0,42voltsin 3rd

author: Neganur
author_rank: Unknown
timestamp: May 28, 2014, 12:13:10 pm
content: I would first check if that corrects your problem by replacing R8 and R9 by a 50k potentiometer:Remove R8 and R9 from the board you already assembled and solder a pot in like in the attached picture.

author: madires
author_rank: Super Contributor
timestamp: May 28, 2014, 12:27:08 pm
content: Please replace the 7805 with a 5V MCP1702 or add an external 2.5V voltage reference (download Karl-Heinz' documentation athttp://www.mikrocontroller.net/svnbrowser/transistortester/Doku/tags/english/for the details).

author: Aigars
author_rank: Regular Contributor
timestamp: May 28, 2014, 02:23:13 pm
content: its samthing moor, its dont coming leters on the screen

author: Aigars
author_rank: Regular Contributor
timestamp: May 28, 2014, 02:26:12 pm
content: Quote from: Aigars on May 28, 2014, 02:23:13 pmand alsou dont make a testmaby samone can give me sett of this tipe tester. schematic ans hardware. schematic please in eagle file.tx

author: Neganur
author_rank: Unknown
timestamp: May 28, 2014, 02:58:51 pm
content: Are you sure that you connected the potentiometer between +5V and GND, with the wiper going to the VO pin?

author: Aigars
author_rank: Regular Contributor
timestamp: May 28, 2014, 03:03:15 pm
content: Quote from: Neganur on May 28, 2014, 02:58:51 pmyes

author: Monkeh
author_rank: Super Contributor
timestamp: May 28, 2014, 03:08:16 pm
content: Quote from: Aigars on May 28, 2014, 03:03:15 pmThen perhaps you can explain why your picture showing it not working, also clearly shows that you did not connect it correctly.

author: Aigars
author_rank: Regular Contributor
timestamp: May 28, 2014, 03:16:41 pm
content: Quote from: Monkeh on May 28, 2014, 03:08:16 pm

author: Monkeh
author_rank: Super Contributor
timestamp: May 28, 2014, 03:17:27 pm
content: Quote from: Aigars on May 28, 2014, 03:16:41 pmI guess you're not interested in learning anything, then.

author: Aigars
author_rank: Regular Contributor
timestamp: May 28, 2014, 03:21:36 pm
content: Quote from: Monkeh on May 28, 2014, 03:17:27 pmcomoon, why not. i mace corect, but samthing not corect.i tray many difirent thinks. mor easy for me make a new board and program new soft.

author: Neganur
author_rank: Unknown
timestamp: May 28, 2014, 03:43:27 pm
content: OK, it seems at least the contrast is working then (compared to the first pictures you posted) and I assume you have tried to adjust the pot to get the best contrast setting.If the display is not showing anything, it could be your microcontroller that is not running the code as it should.I have to ask though to be able to guide you a little better, what is is your experience in electronics? Hobbyist? Got a multimeter around? I assume you etched the board yourself?Can you post a couple of photos of the bottom (solder side) of the board with as little reflections from the flux as possible (different angles)? It might be something as simple as a short circuit somewhere. It looks like your transistors and everything else are soldered in correctly, although I'm not sure if I like the floating /RESET pin.

author: Aigars
author_rank: Regular Contributor
timestamp: May 28, 2014, 04:11:41 pm
content: Quote from: Neganur on May 28, 2014, 03:43:27 pmok i clean flux and make sam piktures mor.

author: lapm
author_rank: Frequent Contributor
timestamp: May 28, 2014, 04:12:07 pm
content: This thread reminds me of old advice i got once: Forget the things that works from power up, you learn much more from those that didint...

author: Aigars
author_rank: Regular Contributor
timestamp: May 28, 2014, 04:24:19 pm
content: there its sam mor pic

author: Aigars
author_rank: Regular Contributor
timestamp: May 28, 2014, 04:26:13 pm
content: Quote from: Aigars on May 28, 2014, 04:11:41 pmya i building may self. i working wif pc. i fixing mb and many moor stufs.

author: Monkeh
author_rank: Super Contributor
timestamp: May 28, 2014, 04:39:21 pm
content: Why is the reset pin floating?

author: Hydrawerk
author_rank: Super Contributor
timestamp: May 28, 2014, 04:56:08 pm
content: What is wrong with that?EDIT: Sorry, i made a mistake.

author: Monkeh
author_rank: Super Contributor
timestamp: May 28, 2014, 04:57:25 pm
content: Quote from: Hydrawerk on May 28, 2014, 04:56:08 pmWell if it's being used as a reset pin, you'll get spurious resets. Or just end up with it being held in reset.

author: PA0PBZ
author_rank: Super Contributor
timestamp: May 28, 2014, 05:00:47 pm
content: Also there is no external clock. I can't look into the software from here but most of these atmega component testers use an external clock.

author: Hydrawerk
author_rank: Super Contributor
timestamp: May 28, 2014, 05:05:11 pm
content: Quote from: PA0PBZ on May 28, 2014, 05:00:47 pmIt depends on the MCU settings. It can run with or without an external crystal. You must set the MCU's fuses correctly.

author: PA0PBZ
author_rank: Super Contributor
timestamp: May 28, 2014, 05:09:11 pm
content: Quote from: Hydrawerk on May 28, 2014, 05:05:11 pmThat is what I mean, you have to load the correct firmware. The design linked to earlier has 3 different designs with of coursedifferent firmware files!I just hope he picked the correct one...

author: Aigars
author_rank: Regular Contributor
timestamp: May 28, 2014, 05:25:06 pm
content: MABY, I DONT KNOW. CAN U HELP GET CORECT? OR MABY FILES FOR NEW PLATE AND SOFT?

author: PA0PBZ
author_rank: Super Contributor
timestamp: May 28, 2014, 05:28:54 pm
content: Quote from: Aigars on May 28, 2014, 05:25:06 pmStart by doing what you should have done in your first post:- Post a link to the design you built- Post a link to the firmware you usedWe can go from there.

author: Aigars
author_rank: Regular Contributor
timestamp: May 28, 2014, 06:06:43 pm
content: Quote from: PA0PBZ on May 28, 2014, 05:28:54 pmi dont know mor. i ben downloaded and ........ .

author: PA0PBZ
author_rank: Super Contributor
timestamp: May 28, 2014, 06:15:41 pm
content: Quote from: Aigars on May 28, 2014, 06:06:43 pmI don't think I can help you without that basic information.

author: Aigars
author_rank: Regular Contributor
timestamp: May 28, 2014, 06:18:35 pm
content: Quote from: PA0PBZ on May 28, 2014, 06:15:41 pmok. maby u can give me board schematic and soft?that what u know its work

author: Monkeh
author_rank: Super Contributor
timestamp: May 28, 2014, 06:22:05 pm
content: Quote from: Aigars on May 28, 2014, 06:06:43 pmIf you managed to download it, surely you can tell us where?

author: PA0PBZ
author_rank: Super Contributor
timestamp: May 28, 2014, 06:23:52 pm
content: Quote from: Aigars on May 28, 2014, 06:18:35 pmSorry, I never built one.

author: Aigars
author_rank: Regular Contributor
timestamp: May 29, 2014, 12:01:23 pm
content: hi. can samone give me transistor tester eagle files and hardware?

author: Aigars
author_rank: Regular Contributor
timestamp: May 29, 2014, 01:00:58 pm
content: Quote from: Monkeh on May 29, 2014, 12:07:53 pmi think, from there coming may testerhttp://mdiy.pl/uniwersalny-tester-elementow-na-avr/

author: madires
author_rank: Super Contributor
timestamp: May 29, 2014, 02:00:02 pm
content: The official project site ishttp://www.mikrocontroller.net/articles/AVR_Transistortesterand you'll find the links to the downloads at the bottom.

author: PA0PBZ
author_rank: Super Contributor
timestamp: May 29, 2014, 02:12:26 pm
content: Quote from: Aigars on May 29, 2014, 01:00:58 pmThat looks like it yes.Now where did you get the software?(you did program the chip did you?)

author: Aigars
author_rank: Regular Contributor
timestamp: May 29, 2014, 04:05:59 pm
content: Quote from: madires on May 29, 2014, 02:00:02 pmi can not finde

author: madires
author_rank: Super Contributor
timestamp: May 29, 2014, 04:23:41 pm
content: Quote from: Aigars on May 29, 2014, 04:05:59 pmhttp://www.mikrocontroller.net/svnbrowser/transistortester/as linked in the download section of the project's web page.

author: PA0PBZ
author_rank: Super Contributor
timestamp: May 29, 2014, 05:25:19 pm
content: Ithinkthis is what you need, but you can only be sure by trying.

author: Aigars
author_rank: Regular Contributor
timestamp: May 29, 2014, 09:05:03 pm
content: tx. i tray make this.

author: M4trix
author_rank: Frequent Contributor
timestamp: May 29, 2014, 09:14:18 pm
content: Quote from: PA0PBZ on May 29, 2014, 05:25:19 pmThat won't make any difference if he doesn't have the right programming equipment for the microcontroller.

author: Aigars
author_rank: Regular Contributor
timestamp: May 29, 2014, 09:15:13 pm
content: Quote from: madires on May 29, 2014, 04:23:41 pmbut this its tester wif screen dimmer.

author: Aigars
author_rank: Regular Contributor
timestamp: May 29, 2014, 09:25:13 pm
content: Quote from: PA0PBZ on May 29, 2014, 05:25:19 pmnop. dont work

author: PA0PBZ
author_rank: Super Contributor
timestamp: May 29, 2014, 09:27:40 pm
content: I give up!

author: dannyf
author_rank: Super Contributor
timestamp: May 29, 2014, 09:30:57 pm
content: You guys are super nice people.

author: madires
author_rank: Super Contributor
timestamp: May 29, 2014, 09:59:08 pm
content: Quote from: Aigars on May 29, 2014, 09:15:13 pmIf you don't like the PWM dimmer just leave it out. Anyway, you're using the old circuit which is obsoleted by Karl-Heinz' improved circuit (see the link for the documentation some posts earlier).

author: Aigars
author_rank: Regular Contributor
timestamp: May 29, 2014, 10:38:12 pm
content: Quote from: madires on May 29, 2014, 09:59:08 pmNO NO, ITS OK. I CAN MAKE A PLATE AND BUILD THIS. I ONE TIME BUILD THIS, BUT EFTIR TAKE A PART. I HAVE SAMWHERE PLANE.TX A LOT