void setup() { // initialize both serial ports: Serial.begin(9600); Serial1.begin(9600); } void loop() { // read from port 1, send to port 0: if (Serial1.available()) { int inByte = Serial1.read(); Serial.write(inByte); } // read from port 0, send to port 1: if (Serial1.available()) { int inByte = Serial1.read(); int inByte1 = digitalRead(40); Serial.write(inByte); Serial.write(inByte1); }