int ledPin = 9; void setup(){ pinMode(ledPin, OUTPUT); Serial.begin(9600); } void loop(){ if(Serial.available()){ char comando = Serial.read(); if(comando == 'a'){ digitalWrite(ledPin, HIGH); Serial.println("LED acceso"); }else if(comando == 's'){ digitalWrite(ledPin, LOW); Serial.println("LED spento"); }else{ Serial.println("Comando non riconosciuto"); } } delay(10); }