A serial program that listens for input on teh serial and flips gpio/relays automatically.

serial program for promicro

// Globals
int ONE = 19;
int TWO = 20;
int THREE = 21;
int FOUR = 18;

void setup() {
  // Put your setup code here, to run once:
  pinMode(ONE, OUTPUT);
  pinMode(TWO, OUTPUT);
  pinMode(THREE, OUTPUT);
  pinMode(FOUR, OUTPUT);

  // Setup serial connection so we cna talk to board over USB
  Serial.begin(9600); // baud rate
  Serial.flush();
}

// MAIN LOOP
void loop() {
     // Take input from serial and 
     String input = "";
     // Read any serial input
     while (Serial.available() > 0){
         input += (char) Serial.read(); // Read in one char at a time
         delay(5); // Delay for 5 ms so the next char has time to be received
     }

     // Decode what message wants program to do.
     if (input == "one:off"){
            digitalWrite(ONE, LOW);
            
     }else if(input =="one:on"){
            digitalWrite(ONE, HIGH); // on
            
     }else if (input == "two:off"){     
            digitalWrite(TWO, LOW);
            
     }else if(input == "two:on"){
             digitalWrite(TWO, HIGH); // on
             
     }else if (input == "three:off"){    
            digitalWrite(THREE, LOW);
            
     }else if(input == "three:on"){ //
            digitalWrite(THREE, HIGH); 
             
     }else if (input == "four:off"){ //off
            digitalWrite(FOUR, LOW);
            
     }else if(input == "four:on"){ //on
            digitalWrite(FOUR, HIGH);
             
     }
}
//END