Hi all I have made 5 PCB with a standalone 328P with internal clock. I uploaded a simple "Hello World" sketch and use a USB adapter connected to RX/TX pin to see the result on terminal. 4 of them work ok, one aleays shows garbish on screen. Code is: void setup() { // put your setup code here, t…

Standalone 328p and UART

6v6gt April 18, 2019, 5:26pm 2

Maybe google for "atmega328p internal oscillator calibration"

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