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Forked from speters/uid.ino
Last active March 11, 2023 10:10
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Arduino atmega328p unique id/serial number
//found this code here
//Purpose is to simply run a memory check on ATMEGA238P to test for counterfeit parts
#include <avr/boot.h>
#define SIGRD 5
void setup() {
// put your setup code here, to run once:
Serial.println("boot sig dump");
int newLineIndex = 0;
for (uint8_t i = 0; i <= 0x1F; i += 1) {
Serial.print(boot_signature_byte_get(i), HEX);
if (newLineIndex == 8) {
newLineIndex = 0;
void loop() {
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Ziggy2013 commented Aug 18, 2021

The fake atmega328p-AU chips will not enter High Voltage Parallel Programming mode. The chip just gets very hot.

I have also noticed chips marked as made in Korea (on reverse side) are often (maybe always) fake.

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