ESP32 duds re-animated!
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- Опубликовано: 4 янв 2024
- Each video I will grab a random electronic component from the vault and build a circuit - this week I look at some ESP32 and Arduino Pro Mini modules that needed surgery, or more...
More info at onecircuit.blogspot.com/2024/...
www.tindie.com/stores/bovineck 
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Tempting me to dig though my scavenge bag. Got a couple of DOA ESP32 boards. Never imagined it might be something as simple as the regulator, figured I'd have to replace the modules.
I was surprised it was so simple - I was just going to check them and turf them if it was anything too complex...but...voltage regulator! ¯\_(ツ)_/¯
If someone tries to run em at 5v, or puts too much power in via the pins... The regulator goes pop.
Guess how I know...🙄
General fault finding tip 1. Check the power is what it is supposed to be. Amazing how many times that turns out to be the problem.
I keep a few regulators and USB sockets to hand. Recovered more than one Arduino that way. And a few ESPs.
Good luck. 👍😀
I think the third, central pad on the SMD crystal is just shield grounding so it probably wouldn't have mattered much for testing.
Yes I should have dived a bit deeper but I saw it and realised that I might be a little out of my depth, PLUS the return for effort ratio was dropping rapidly! 👍😀
The 3rd pad usually indicates that it is a crystal resonator, which basically is a crystal oscillator with built-in caps to GND (hence why you need the 3rd pad). If you want to replace it with a crystal oscillator you would need to add those caps to GND externally.
You may not have much luck finding a ProMini 3.3v running at 16MHz. The official specs for the ATmega328P requires 4.5-5.5v for 0-20MHz operation. It can do 0-10MHz at 2.7-5.5v.
Also; the tab on the AMS1117 is Vout, not GND :)
Ahh thank you for that. I normally look up the pinout but to be honest I had zero expectation at that stage it was going to be such a simple fix! 👍😀
Some EPROM programmers can set Atmel fuses. My GQ-4X has salvaged some ATtiny85s.
Doesn't do GALs though grr..
It should prove a cautionary tale for next time…maybe. 😬