ESP8266 Board random exceptions & not allowing upload

Using Arduino Microcontrollers
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Hi All,

I am looking for some general advice on what you think could be the problem with my Arduino ESP8266 boards.

Been running some simple WiFi AP code on numerous ESP8266 boards and recently: two of them have been getting random exceptions (with working code/serial outputs in between) which then turn into normal running after a while. This has only started happening after I plugged them into a PSU for testing the boards with some external kit but unsure how this could've affected them.

Decoding of the exceptions tells me that there are illegal instructions in one of the libraries I am using. But this doesn't make sense as these libraries are used in the working boards, and they have no exceptions or issues. I then proceed to try and upload to the boards to put some easy blinking code, but it keeps on saying that the serial port _ does not exist. Serial monitor works fine, as I can see what is being outputted. Any ideas on what could be the issue? Doing the same upload process as before.

Many thanks in advance.

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Example Serial monitor:

image
image1007×969 18.7 KB

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All in the same upload sequence:

image
image1684×580 51.7 KB

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Next attempt:

image
image1679×533 42.3 KB

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erase attempt:

image
image1226×155 6.14 KB

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Just do a copy for forum on that instead of a screenshot.

The PSU type etc. ?

And is there anything connected to any of the pins anywhere ?

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Did the OP put the debug info into the ESP Exception decoder? If the OP did, could the OP post the Exception Decoder Results?

How are we expected to fix an error in coding without being able to look at the code, in code tags?

And whiles I am at it, post an image of the OP's project.

Oh, and post a schematic.

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Hello @kriscollier

Your topic has been moved to a more suitable location on the forum. Installation and Troubleshooting is not for problems with (nor for advice on) your project :wink: See About the Installation & Troubleshooting category.

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Please see linked for a better post. Apologies.

Unable to upload code using same settings as before - Using Arduino / Installation & Troubleshooting - Arduino Forum

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Please see
Unable to upload code using same settings as before - Using Arduino / Installation & Troubleshooting - Arduino Forum

Apologies.

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