Simple blink d'un LED en local sans interaction autre que la serial.
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#GPIOX <- !!! et pas D0
#define PIN_LED 16
void setup() {
delay(3000);
Serial.begin(115200);
pinMode(PIN_LED, OUTPUT);
}
void loop() {
Serial.print("loop\n");
digitalWrite(PIN_LED, HIGH);
delay(500);
digitalWrite(PIN_LED, LOW);
delay(500);
}