// csvMega2560Serial1Sender.ino void setup() { Serial.begin(9600); for (int i = 10; i > 0; i--) { Serial.print(' '); Serial.print(i); delay(500); } Serial.println(); Serial1.begin(9600); Serial.println(F("Started ")); } float longitudeOut = 55.928; float latitudeOut = 23.789; void loop() { delay(1000); // don't use delays in your code !! Serial.println(F("sending CSV")); Serial1.print(longitudeOut, 6); Serial1.print(','); Serial1.print(latitudeOut); Serial1.print('\n'); //use to only send \n //Serial1.println(); // actually sends \r\n }