int ledPin=13; char receivedByte; void setup() { Serial.begin(9600); Serial1.begin(19200); pinMode(ledPin,OUTPUT); Serial.println("\r\nStarten\r"); Serial1.print("AT+CPIN=xxxx\r"); delay(4000); Serial1.print("AT+CMGF=1\r"); delay(4000); Serial1.print("AT+CMGR=1\r"); delay(4000); Serial.println(Serial1.read()); } void loop() { if(Serial1.available()>0) { //Serial.println(Serial1.read()); char antw = Serial1.read(); Serial.print(antw); digitalWrite(ledPin,HIGH); } }