#include <SoftwareSerial.h>
SoftwareSerial SIM900(7, 8);
void setup() {
Serial.begin(115200);
SIM900.begin(19200);
Serial.println("AppStart");
delay(20000);
sendSMS();
}
void loop() {
}
void sendSMS() {
SIM900.print("AT+CMGF=1\r");
delay(100);
SIM900.println("AT + CMGS = \"+xxxxxxxxx\"");
delay(100);
SIM900.println("Hello, how doin'?!!");
delay(100);
SIM900.println((char)26);
delay(100);
SIM900.println();
delay(5000);
}