[SOLVED] Upload works only once

Hi all,

I have created a PCB with an Atmega328p using the same information as a nano, my schematic is attached.

When I burn ATmegaBOOT_168_atmega328.hex then I can upload the blink sketch it works. But if I want to upload something again, nothing works. I am force to burn bootloader again !

Do you see the reason why ?

Best regards
Denis

You don't have the auto-reset circuitry.

You are absolutely right, I added a 100nF capacitor between reset pin from 328p and DTR and now it works as expected.

thank you