This is a continuation of this thread: https://www.avrfreaks.net/forum/u...
So today I bought a MAX3232 connected to my AT and it seems to be working well. I can see the 'c' coming at the PC side.
However I realized that right after when I connect the battery to the circuit, the AT sends a few '0's rather than 99 (aka 'c').
Is that because the MCU has not yet 'booted' / initialised yet ? Or why this happens ?
Here is the output:
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