char mystr[40] = "-180.00 -180.00 -180.00 -180.00"; //String data int x = 0; void setup() { // Begin the Serial at 9600 Baud Serial3.begin(9600); } void loop() { //char buf[5]; //String(x).toCharArray(buf,5); Serial3.write(mystr,40); //Write the serial data delay(100); }