GSM Based Home Automation

Just Do Electronics January 01, 2022

Circuit Diagram :-

Code :-

 
//Prateek
//wwww.prateeks.in
//https://www.youtube.com/c/JustDoElectronics/videos

#include <SoftwareSerial.h>
#include "Adafruit_FONA.h"

#define FONA_RX    2
#define FONA_TX    3
#define FONA_RST   4


const String PHONE = "+91xxxxxxxxxx"; //sender phone number here with country code

String smsStatus, senderNumber, receivedDate, msg, buff;
boolean isReply = false;
String dtmf_cmd;
boolean is_call = false;


#define FONA_RI_INTERRUPT  0
SoftwareSerial fonaSS = SoftwareSerial(FONA_TX, FONA_RX);

Adafruit_FONA fona = Adafruit_FONA(FONA_RST);



#define button1_pin 4
#define button2_pin 5
#define button3_pin 6
#define button4_pin 7

#define relay1_pin 8
#define relay2_pin 9
#define relay3_pin 10
#define relay4_pin 11

boolean relay1_state = 1;
boolean relay2_state = 1;
boolean relay3_state = 1;
boolean relay4_state = 1;

void setup()
{
  pinMode(button1_pin, INPUT);
  pinMode(button2_pin, INPUT);
  pinMode(button3_pin, INPUT);
  pinMode(button4_pin, INPUT);

  pinMode(relay1_pin, OUTPUT);
  pinMode(relay2_pin, OUTPUT);
  pinMode(relay3_pin, OUTPUT);
  pinMode(relay4_pin, OUTPUT);


  digitalWrite(relay1_pin, relay1_state);
  digitalWrite(relay2_pin, relay2_state);
  digitalWrite(relay3_pin, relay3_state);
  digitalWrite(relay4_pin, relay4_state);
  Serial.begin(115200);


  fonaSS.begin(9600);
  if (! fona.begin(fonaSS)) {
    Serial.println(F("Couldn't find FONA"));
    while (1);
  }
  Serial.println(F("FONA is OK"));

  fona.println("AT");
  delay(500);
  fona.print ("AT+CSMP=17,167,0,0\r");
  fona.println("AT+DDET=1");
  delay(500);

  smsStatus = "";
  senderNumber = "";
  receivedDate = "";
  msg = "";

}

void loop()
{
  while (fona.available()) {
    buff = fona.readString();
    handle_sim800_response();
  }
  while (Serial.available())  {
    fona.println(Serial.readString());
  }

  // listen_iir();

  listen_push_buttons();

}

void handle_sim800_response()
{
  Serial.println(buff);
  if (is_call == true) {
    if (int index = buff.indexOf("+DTMF:") > -1 ) {
      index = buff.indexOf(":");
      dtmf_cmd = buff.substring(index + 1, buff.length());
      dtmf_cmd.trim();
      Serial.println("dtmf_cmd: " + dtmf_cmd);

      if (dtmf_cmd == "1")      control_relay(1);
      else if (dtmf_cmd == "2") control_relay(2);
      else if (dtmf_cmd == "3") control_relay(3);
      else if (dtmf_cmd == "4") control_relay(4);
    }
    if (buff.indexOf("NO CARRIER") > -1) {
      fona.println("ATH");
      is_call = false;
    }
  }
  else if (buff.indexOf("RING") > -1)
  {
    delay(2000);
    fona.println("ATA");
    is_call = true;
  }
  else if (buff.indexOf("+CMTI") > -1)
  {
    unsigned int index = buff.indexOf(",");
    String temp = buff.substring(index + 1, buff.length());
    temp = "AT+CMGR=" + temp + "\r";
    fona.println(temp);
  }
  else if (buff.indexOf("+CMGR") > -1) {
    extractSms();

    if (msg == "1")      control_relay(1);
    else if (msg == "2") control_relay(2);
    else if (msg == "3") control_relay(3);
    else if (msg == "4") control_relay(4);
    else if (msg.indexOf(".status") > -1) send_relay_status(msg.substring(0, 1));
    else if (msg.indexOf("del all") > -1) delete_all_sms();
  }
}

void extractSms() {
  unsigned int len, index;
  index = buff.indexOf("\r");
  buff.remove(0, index + 2);
  buff.trim();
  index = buff.indexOf(":");
  buff.substring(0, index);
  buff.remove(0, index + 2);
  index = buff.indexOf(",");
  smsStatus = buff.substring(1, index - 1);
  buff.remove(0, index + 2);

  senderNumber = buff.substring(0, 13);
  buff.remove(0, 19);

  receivedDate = buff.substring(0, 20);
  buff.remove(0, buff.indexOf("\r"));
  buff.trim();

  index = buff.indexOf("\n\r");
  buff = buff.substring(0, index);
  buff.trim();
  msg = buff;
  buff = "";
  msg.toLowerCase();
}

void listen_push_buttons() {
  if (digitalRead(button1_pin) == LOW) {
    delay(200);
    control_relay(1);
  }
  else if (digitalRead(button2_pin) == LOW) {
    delay(200);
    control_relay(2);
  }
  else if (digitalRead(button3_pin) == LOW) {
    delay(200);
    control_relay(3);
  }
  else if (digitalRead(button4_pin) == LOW) {
    delay(200);
    control_relay(4);
  }
}
void control_relay(int relay) {
  if (relay == 1) {
    relay1_state = !relay1_state;
    digitalWrite(relay1_pin, relay1_state);
    Serial.print("RelayState = ");
    Serial.println(relay1_state);
    delay(50);
  }
  else if (relay == 2) {
    relay2_state = !relay2_state;
    digitalWrite(relay2_pin, relay2_state);
    delay(50);
  }
  else if (relay == 3) {
    relay3_state = !relay3_state;
    digitalWrite(relay3_pin, relay3_state);
    delay(50);
  }
  else if (relay == 4) {
    relay4_state = !relay4_state;
    digitalWrite(relay4_pin, relay4_state);
    delay(50);
  }
}

void send_relay_status(String relay)
{
  Serial.println("Relay Number: " + relay);
  //(relay1_state):"ON"?"OFF"
  String sms_text = "";
  if (relay == "1") {
    sms_text = (relay1_state) ? "OFF" : "ON";
    sms_text = "Relay 1 is " + sms_text;
  }
  else if (relay == "2") {
    sms_text = (relay2_state) ? "OFF" : "ON";
    sms_text = "Relay 2 is " + sms_text;
  }
  else if (relay == "3") {
    sms_text = (relay3_state) ? "OFF" : "ON";
    sms_text = "Relay 3 is " + sms_text;
  }
  else if (relay == "4") {
    sms_text = (relay4_state) ? "OFF" : "ON";
    sms_text = "Relay 4 is " + sms_text;
  }
  Reply(sms_text);
}

void delete_all_sms()
{
  fona.println("AT+CMGD=1,4");
  delay(5000);
  while (fona.available()) {
    String response = fona.readString();
    if (response.indexOf("OK") > -1 ) {
      Reply("All sms are deleted");
    } else {
      Reply(response);
    }
  }
}


void Reply(String text)
{
  Serial.println(text);
  fona.print("AT+CMGF=1\r");
  delay(1000);
  fona.print ("AT+CSMP=17,167,0,0\r");
  fona.print("AT+CMGS=\"" + PHONE + "\"\r");
  delay(1000);
  fona.print(text);
  delay(100);
  fona.write(0x1A);
  //sim800.println((char)26);
  delay(1000);
  Serial.println("SMS Sent Successfully.");

  msg = "";
}

Video :-

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