GSM Based Home Automation

 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 :-