Issue : Arduino pro micro wiring prevent it to power up

Other Hardware General Electronics
1

Hi everyone,
I’m working on a midi controller project, and I discovered that the way I wire my Arduino stops it to power up, but I can’t figure out why… (this happened on 2 separated attempts over 4, without anything I changed)

I use an Arduino pro micro, a custom pcb board, and some potentiometers, nothing fancy. The only pins I use are the ADC ones, VCC and GND. Once I have soldered the Arduino to the pcb, it works fine in the first place, but after a few hours, it refuses to power up. I removed it form the pcb to see what was wrong, and it was just fine again… this happened two times, on two separated Arduino pro micro… Does anyone has a clue on what could possibly go wrong ?

A few more precisions : I have soldered the Arduino using pin headers, so every pin is “soldered” (it was easier than checking which pin I was actually using) but obviously most of them with nothing at the end except the plastic board.

The Arduino isn’t damaged since it worked after being removed, and whatever prevents it to power up, it doesn’t trigger immediately, but remains as long as I know…

Thank you a lot if you have any clue !!

2

Welcome to the forum

I have no idea what you mean by this. Please explain in more detail or post a 'photo showing what you mean

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image
image3024×4032 2.46 MB

Sorry if it wasn’t clear. I just wanted to say that I did not leave empty the pins I don’t use. They are connected to nothing but perhaps this has an effect I don’t understand…

4

I still don't understand what you have done, but one thing that I will say is that the soldering that I can see is atrocious

What is actually soldered to the PCB and why is one end of the Arduino flush with what I assume is the PCB and the other end raised above it ?

5

FIrst, thank you for your quick answer. And sorry for my bad explanations (and soldering skills...). I'll try to improve.

I have soldered an arduino pro mirco to a pcb, with some other potentiometers on it. On the following picture, you can see it. It's placed beneath the pcb, with the "up" of it facing the pcb (the resistors and all components are not visible)

here is a picture from the backside of the arduino :

IMG_5767
IMG_57671920×2560 230 KB

here is a picture from the side

IMG_5763
IMG_57631715×3541 291 KB

This (maybe) wierd arduino orientation serves other purposes in the project.

My issue is that once the arduino is soldered to the pcb, it stops powering up after a few hours (I first thought there was someting broken), but works fine as soon as it's removed from the pcb.

6

I can offer no explanation as to what is causing the problem but your method of mounting the Arduino is unusual to say the least. Why did you mount it with the components against the PCB ?

7

Because I had to plug another wierdly orientated thing in the arduino's flush, and this was the only way to make it work... Thanks for trying to help !

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