| Electronics > Beginners |
| Pulling my hair out. Circuit boards stop working once shipped to client and more |
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| DimitriP:
--- Quote ---I'm puzzled. --- End quote --- The lack of an oscilloscope is also a bit puzzling. |
| Jackster:
--- Quote from: ebastler on June 07, 2019, 05:58:13 pm --- --- Quote from: Jackster on June 07, 2019, 05:30:03 pm ---The device takes a PWM input from a sensor and displays the result on 7 segment displays. It can transmit this info over the WiFi interface to another that will take the data from the WiFi and display it on its seven segment display. --- End quote --- Is that the unit conversion device for sonar measurements which you had posted about earlier, by any chance? These are used on boats, I would assume. Are you sure they handle the vibrations and humidity well? (Is this maybe also the "three boards connected via FFC connectors" design you have also asked questions about in earlier threads? If so, are you sure the connectors are robust enough, and are you sure the signals make it across the connections in good shape?) May I add a personal comment: It would not hurt if you had the courtesy to let us know what your product is and does, and give us a link to the website you presumably have. You are selling these for profit, it seems, and are asking for free advice here. At least satisfy our curiosity in return; and the information may help with the troubleshooting as well. --- End quote --- Yea a few years back. Same project but a lot further on. Not used on boats, and the boards are conformally coated. I am not using the FFC connectors. That design was stupid and over complex. Moved all the processing to a single board and now use 4 pin cables with JST connectors to transmit power and data. Note that this is for a different board. This topic is about the other board I make. I very much don't want to link the product. This is obviously not a good look to have. Yes I do sell for profit, I hope I made that clear in the OP. This topic was more for knowing what to do next rather than actual debugging which I think is above my skill level. As mentioned previously, quite happy to pay for someone to take a look and re-make the boards. --- Quote from: DimitriP on June 07, 2019, 06:27:17 pm --- --- Quote ---I'm puzzled. --- End quote --- The lack of an oscilloscope is also a bit puzzling. --- End quote --- I would not know what to do with it.. |
| GreggD:
You might want to inject a external oscillator into the atmel crystal input pin. Then try to program and set crystal drive level fuses. Works for me. |
| soldar:
--- Quote from: mikeselectricstuff on June 06, 2019, 08:25:47 am ---... my guess would be oscillator startup issues - assuming you use a crystal or ceramic resonator. This would be consistent with inability to program and some units working and some not. ... If you have a dead board in front of you, poke the oscillator pins and see if it starts. --- End quote --- good thinking! |
| langwadt:
--- Quote from: Jackster on June 07, 2019, 11:16:08 am ---I am not saying the FTDI chip is the cause btw. Just that when removed and replaced with a known working one, there is no boot loader issues. I am pretty much on board with the issue being the board design. Probably just coincidence that the old FTDI is working and the new ones are not? Only tested a handful. --- Quote from: Ian.M on June 07, 2019, 10:34:44 am ---Possible fake FTDI chips? Hack a bad board to loop the FDTI's RX and TX pins, open the USB serial port with a terminal program and see if it responds --- Code: ---NON GENUINE DEVICE FOUND! --- End code --- character by character as you type instead of the loopback echoing what you type. (see: https://www.eevblog.com/forum/microcontrollers/ftdi-gate-2-0/ ) --- End quote --- I don't think so. They all have different serial numbers. They were cheap though at $2.78 per chip. Doing as you said, it just echos back what I type. --- End quote --- the FTDI "NON GENUINE DEVICE FOUND!" is a driver thing so it might work just fine with an old driver and fail if using a newer driver |
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