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int incomingByte = 0;        // for incoming serial data

 

void setup() {

 Serial.begin(9600);        // opens serial port, sets data rate to 9600 bps

}

 

void loop() {

 

 // send data only when you receive data:

 if (Serial.available() > 0) {

         // read the incoming byte:

         incomingByte = Serial.read();

 

         // say what you got:

         Serial.print("I received: ");

         Serial.println(incomingByte, DEC);

 }

}