Hello, I have a prototype PCB which is essentially exactly the same as the schematic for an Arduino Mini Pro (I am using two 22pF decoupling capacitors and a 16MHz external crystal, there is no LED on pin 13 or swtich on reset, but all the 0.1uF decoupling capacitors are in place on VCC and AREF). …

Atmega328p won't program on custom PCB

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