String command; int led = 11 ; int led2 = 2 ; void setup() { Serial.begin(9600); Serial.setTimeout(50); pinMode(led, OUTPUT); pinMode(led2, OUTPUT); } void loop() { while (Serial.available()){ command = Serial.readString(); command.trim(); if (command == "blue on"){ digitalWrite(led2, HIGH); Serial.println("Blue is on"); } if(command == "blue off"){ digitalWrite(led2,LOW); Serial.println("Blue is off"); } if (command == "red on"){ digitalWrite(led, HIGH); Serial.println("Red is on"); } if(command == "red off"){ digitalWrite(led,LOW); Serial.println("Red is off"); } if(command == "all on"){ digitalWrite(led,HIGH); digitalWrite(led2,HIGH); Serial.println("All are on"); } if(command == "all off"){ digitalWrite(led,LOW); digitalWrite(led2,LOW); Serial.println("All off"); } } delay(50); }