[SOLVED] Upload works only once

Other Hardware 3rd Party Boards
1

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

Arduino.jpg
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2

You don't have the auto-reset circuitry.

3

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

thank you