How to Control an LED by Phone Call

This project is about how to control an LED through Phone Call from a Mobile.

https://www.youtube.com/watch?v=Nf0XfYV6gFc

Components Required

1. Arduino Uno

2. GSM SIM 800 C Module

3. SIM Card

4. 12 V Adapter

5. LED

Here we are using GSM SIM 800 C Shield. Since it is shield, we can place this shield directly on the Arduino Uno Board like below.

Insert the SIM Card in the holder provided in the GSM Module and then lock the SIM Card holder like below.

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Then give the power supply to the GSM Module.

In the program we need to give the phone number where we need to send the message. For this module, no need to give the country code in front of the phone number. In case if you are facing problem to send SMS from your board, you can add the country code.

Circuit Connection

1. Connect the positive pin of LED to PIN 13 in the GSM Module

2. Connect the negative pin of LED to GND pin in the GSM Module

Source Code

//Tech Trends Shameer
//Control LED by Phone Call

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

#define FONA_RX            2
#define FONA_TX            3
#define FONA_RST           4
 
#define FONA_RI_INTERRUPT  0
int led = 13; 
String techtrends;
SoftwareSerial fonaSS = SoftwareSerial(FONA_TX, FONA_RX);
 
Adafruit_FONA fona = Adafruit_FONA(FONA_RST);
 
void setup() {
  pinMode(led, OUTPUT);     
  Serial.begin(115200);
  Serial.println(F("FONA incoming call example"));
  Serial.println(F("Initializing....(May take 3 seconds)"));
  delay(3000);
  fonaSS.begin(4800); // if you're using software serial
  if (! fona.begin(fonaSS)) {           // can also try fona.begin(Serial1) 
    Serial.println(F("Couldn't find FONA"));
    while (1);
  }
  Serial.println(F("FONA is OK"));
 
  if(fona.callerIdNotification(true, FONA_RI_INTERRUPT)) {
    Serial.println(F("Caller id notification enabled."));
  }
  else {
    Serial.println(F("Caller id notification disabled"));
  }


// Code from Loop Start
if (! fona.begin(fonaSS)) {           // can also try fona.begin(Serial1) 
    Serial.print("GSM Kit Not Working");
     }
     else
  fona.callerIdNotification(true, FONA_RI_INTERRUPT);
  char phone[32] ={0};
   
  if(fona.incomingCallNumber(phone)){
   Serial.println(F("RING!"));
    Serial.print(F("Phone Number: "));
    techtrends=phone;
    
    Serial.print("Call From: ");
    Serial.println(techtrends);
    
    digitalWrite(led, HIGH);
    delay(30000);
    digitalWrite(led, LOW);
    if(fona.callerIdNotification(true, FONA_RI_INTERRUPT)) {
    Serial.println(F("Caller id notification enabled."));
    } 
    }
//Code From Loop End
  
}
 
void loop(){
     
  
  }

Video of the project