Proyek crowdfunding "Noorik" - Modul GSM open source untuk gerbang otomatis

#include <SoftwareSerial.h>
SoftwareSerial mySerial(2, 3); // RX, TX
int ch = 0;
int led = 13;
String val = "";

void setup() {
  delay(2000);  //   
  pinMode(led, OUTPUT);
  digitalWrite(led, LOW);
  Serial.begin(9600);  // 
  Serial.println("GSM tester v1.0");
  mySerial.begin(9600);
  mySerial.println("AT+CLIP=1");  // 
  delay(100);
  mySerial.println("AT+CMGF=1");  //   -  ( .)
  delay(100);
  mySerial.println("AT+CSCS=\"GSM\"");  //  
  delay(100);
}

void loop() {
  if (mySerial.available()) {  // GSM  -  , 
    while (mySerial.available()) {  //     val
      ch = mySerial.read();
      val += char(ch);
      delay(10);
    }
    if (val.indexOf("RING") > -1) {  //  ,   
      if (val.indexOf("71234567890") > -1) {  //   .     "+"
        Serial.println("--- MASTER RING DETECTED ---");
        mySerial.println("ATH0");  // 
        digitalWrite(led, HIGH);  //   3 
        delay(3000);
        digitalWrite(led, LOW);  // 
      }
    } else
      Serial.println(val);  //     
    val = "";
  }
  if (Serial.available()) {  //     -
    while (Serial.available()) {  //    val
      ch = Serial.read();
      val += char(ch);
      delay(10);
    }
    //mySerial.println(val);  //  ,      GSM 
    if (val.indexOf("sendsms") > -1) {  //    
      sms(String("hello world"), String("+71234567890"));  //    +71234567890
    }
    val = "";  //
  }
}

void sms(String text, String phone)  //  
{
  Serial.println("SMS send started");
  mySerial.println("AT+CMGS=\"" + phone + "\"");
  delay(500);
  mySerial.print(text);
  delay(500);
  mySerial.print((char)26);
  delay(500);
  Serial.println("SMS send complete");
  delay(2000);
}