I'm trying to build fire alarm system using GSM 800l

oluwasefunmi · May 7, 2022, 3:50pm

Hello
Please I'm trying to build fire alarm system with GSM 800l module but it's not working. I connected properly and uploaded the code on the Arduino and all the components indicate light when I connected it to power source but it's not detecting fire but the buzzer keep beeping.

Below was the code I used.


 #include <SoftwareSerial.h> 
  
 //Alarm reciever's phone number with country code 
 const String PHONE_1 = "+2348149774052"; 
 const String PHONE_2 = ""; //optional 
 const String PHONE_3 = ""; //optional 
 
  
 #define rxPin 2 
 #define txPin 3 
 SoftwareSerial sim800L(rxPin,txPin); 
  
 #define flame_sensor_pin 5 
 //fire_flag = 0 means no fire detected 
 boolean fire_flag = 0; 
  
  
  
 #define buzzer_pin 4 
  
  
 void setup() 
 { 
   
   //Begin serial communication: Arduino IDE (Serial Monitor) 
   Serial.begin(115200); 
    
   
   //Begin serial communication: SIM800L 
   sim800L.begin(9600); 
    
   
   pinMode(flame_sensor_pin, INPUT); 
    
   
   pinMode(buzzer_pin, OUTPUT); 
   digitalWrite(buzzer_pin,LOW); 
    
   
   Serial.println("Initializing..."); 
   //Once the handshake test is successful, it will back to OK 

   sim800L.println("AT"); 
   delay(1000); 
   sim800L.println("AT+CMGF=1"); 
   delay(1000); 
   
 } 
  
 void loop() 
 { 
   while(sim800L.available()){ 
   Serial.println(sim800L.readString()); 
   } 
    
   int flame_value = digitalRead(flame_sensor_pin); 
    
   
   //The fire is detected, trigger Alarm and send sms 
   if(flame_value == LOW) 
   { 
     digitalWrite(buzzer_pin,HIGH); 
     
     if(fire_flag == 0) 
     { 
       Serial.println("Fire Detected."); 
       fire_flag == 1; 
       send_multi_sms(); 
       make_multi_call(); 
     } 
     
   } 
   
   //No fire is detected, turn OFF Alarm 
   else 
   { 
     digitalWrite(buzzer_pin,LOW); 
     fire_flag = 0; 
   } 
   
 void send_multi_sms() 
 { 
   if(PHONE_1 != ""){ 
     Serial.print("Phone 1: "); 
     send_sms("Fire is Detected", PHONE_1); 
   } 
   if(PHONE_2 != ""){ 
     Serial.print("Phone 2: "); 
     send_sms("Fire is Detected", PHONE_2); 
   } 
   if(PHONE_3 != ""){ 
     Serial.print("Phone 3: "); 
     send_sms("Fire is Detected", PHONE_3); 
   } 
 } 
 
 void make_multi_call() 
 { 
   if(PHONE_1 != ""){ 
     Serial.print("Phone 1: "); 
     make_call(PHONE_1); 
   } 
   if(PHONE_2 != ""){ 
     Serial.print("Phone 2: "); 
     make_call(PHONE_2); 
   } 
   if(PHONE_3 != ""){ 
     Serial.print("Phone 3: "); 
     make_call(PHONE_3); 
   } 
 } 
 
 void send_sms(String text, String phone) 
 { 
     Serial.println("sending sms...."); 
     delay(50); 
     sim800L.print("AT+CMGF=1\r"); 
     delay(1000); 
     sim800L.print("AT+CMGS=\""+phone+"\"\r"); 
     delay(1000); 
     sim800L.print(text); 
     delay(100); 
     sim800L.write(0x1A); //ascii code for ctrl-26 //Serial2.println((char)26); //ascii code for ctrl-26 
     delay(5000); 
 } 
 
 void make_call(String phone) 
 { 
     Serial.println("calling...."); 
     sim800L.println("ATD"+phone+";"); 
     delay(20000); //20 sec delay 
     sim800L.println("ATH"); 
     delay(1000); //1 sec delay 
 }

Below was my wiring diagram.

Please help me

Paul_KD7HB · May 7, 2022, 4:29pm

Did you test EACH device, separately, before you combined the whole into a single program? If not, go back and test each device with it's own test code, so you know IT works. As it is now, you do not know which piece is causing problems.

oluwasefunmi · May 7, 2022, 4:32pm

I only tested all the components by using power supply and ensuring that the LED indicator is ON. I'm new to Arduino so I don't know how to test with test code

The buzzer continue beeping anytime I power the whole system meanwhile it's supposed to beep only when flame is detected

wildbill · May 7, 2022, 5:43pm

Your code doesn't compile.

oluwasefunmi · May 7, 2022, 6:06pm

Please help me on this...

How can I make it compile?
It shows 'compiling...' and 'done uploading' when I uploaded the code on Arduino..

wildbill · May 7, 2022, 6:12pm

Somehow when you copied it to the forum, it acquired some extra characters that mean I get errors like:

stray '\342' in program

which usually means it was copied or pasted from a web page. Just copy it from the IDE and paste it here in code tags.

oluwasefunmi · May 7, 2022, 6:23pm

#include <SoftwareSerial.h>

//MMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMM
//Alarm reciever's phone number with country code
const String PHONE_1 = "+2348149774052";
const String PHONE_2 = ""; //optional
const String PHONE_3 = ""; //optional
//MMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMM

//MMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMM
#define rxPin 2
#define txPin 3
SoftwareSerial sim800L(rxPin,txPin);
//MMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMM

//MMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMM
#define flame_sensor_pin 5
//fire_flag = 0 means no fire detected
boolean fire_flag = 0;
//MMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMM

//MMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMM
#define buzzer_pin 4
//MMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMM

void setup()
{
  //-----------------------------------------------------------------------------------
  //Begin serial communication: Arduino IDE (Serial Monitor)
  Serial.begin(115200);
  
  //-----------------------------------------------------------------------------------
  //Begin serial communication: SIM800L
  sim800L.begin(9600);
  
  //-----------------------------------------------------------------------------------
  pinMode(flame_sensor_pin, INPUT);
  
  //-----------------------------------------------------------------------------------
  pinMode(buzzer_pin, OUTPUT);
  digitalWrite(buzzer_pin,LOW);
  
  //----------------------------------------------------------------------------------
  Serial.println("Initializing...");
  //Once the handshake test is successful, it will back to OK
  sim800L.println("AT");
  delay(1000);
  sim800L.println("AT+CMGF=1");
  delay(1000);
  //-----------------------------------------------------------------------------------
}

void loop()
{
  while(sim800L.available()){
  Serial.println(sim800L.readString());
  }
  
  int flame_value = digitalRead(flame_sensor_pin);
  
  //MMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMM
  //The fire is detected, trigger Alarm and send sms
  if(flame_value == LOW)
  {
    digitalWrite(buzzer_pin,HIGH);
    //----------------------------------------------------------------
    if(fire_flag == 0)
    {
      Serial.println("Fire Detected.");
      fire_flag == 1;
      send_multi_sms();
      make_multi_call();
    }
    //----------------------------------------------------------------
  }
  //MMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMM
  //No fire is detected, turn OFF Alarm
  else
  {
    digitalWrite(buzzer_pin,LOW);
    fire_flag = 0;
  }
  //MMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMMM
}

//NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN
void send_multi_sms()
{
  if(PHONE_1 != ""){
    Serial.print("Phone 1: ");
    send_sms("Fire is Detected", PHONE_1);
  }
  if(PHONE_2 != ""){
    Serial.print("Phone 2: ");
    send_sms("Fire is Detected", PHONE_2);
  }
  if(PHONE_3 != ""){
    Serial.print("Phone 3: ");
    send_sms("Fire is Detected", PHONE_3);
  }
}
//NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN

//NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN
void make_multi_call()
{
  if(PHONE_1 != ""){
    Serial.print("Phone 1: ");
    make_call(PHONE_1);
  }
  if(PHONE_2 != ""){
    Serial.print("Phone 2: ");
    make_call(PHONE_2);
  }
  if(PHONE_3 != ""){
    Serial.print("Phone 3: ");
    make_call(PHONE_3);
  }
}
//NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN

//NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN
void send_sms(String text, String phone)
{
    Serial.println("sending sms....");
    delay(50);
    sim800L.print("AT+CMGF=1\r");
    delay(1000);
    sim800L.print("AT+CMGS=\""+phone+"\"\r");
    delay(1000);
    sim800L.print(text);
    delay(100);
    sim800L.write(0x1A); //ascii code for ctrl-26 //Serial2.println((char)26); //ascii code for ctrl-26
    delay(5000);
}
//NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN

//NNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNNN
void make_call(String phone)
{
    Serial.println("calling....");
    sim800L.println("ATD"+phone+";");
    delay(20000); //20 sec delay
    sim800L.println("ATH");
    delay(1000); //1 sec delay
}

cattledog · May 7, 2022, 7:05pm

Simple code like this to confirm that the flame sensor responds as you think it should.

#define flame_sensor_pin 5
void setup()
{  
  Serial.begin(115200);
  pinMode(flame_sensor_pin, INPUT);  
}
void loop()
{
  int flame_value = digitalRead(flame_sensor_pin);
  Serial.println(flame_value);
  delay(1000);   
}

Then add buzzer code

#define flame_sensor_pin 5
#define buzzer_pin 4
void setup()
{
  Serial.begin(115200);
  pinMode(flame_sensor_pin, INPUT);
  pinMode(buzzer_pin, OUTPUT);
}
void loop()
{
  int flame_value = digitalRead(flame_sensor_pin);
  Serial.println(flame_value);
  if (flame_value == LOW)
  {
    digitalWrite(buzzer_pin, HIGH);
  }
  else
  {
    digitalWrite(buzzer_pin, LOW);
  }
  delay(1000);
}

If the flame sensor and buzzer work as expected, then add the sms code or go and try the code you found and copied. The delay(1000) is only for simple test purposes , and will not be in your final code.

hallowed31 · May 7, 2022, 7:11pm

Don't make a fire alarm system with Arduino that is for actual life safety application. For a science project, sure. That's it.

oluwasefunmi · May 7, 2022, 7:16pm

Okay, I will do that
Thank you

oluwasefunmi · May 7, 2022, 7:18pm

No, it's just for final year project..
Thank you

hallowed31 · May 7, 2022, 7:24pm

Awesome. Good luck!

oluwasefunmi · May 14, 2022, 12:13am

Thank you so much for this... The flame sensor and the buzzer is now working properly but the sim800l is not sending any message. I'm always getting question mark

The below is the image of the message I always get

Sorry for the poor background and quality

cattledog · May 14, 2022, 12:25am

The best tutorial I know for the sim800l is
https://lastminuteengineers.com/sim800l-gsm-module-arduino-tutorial/

Pay attention to the power requirements.

Just like with the buzzer and flame sensor you can write simple test code to develop and verify the AT communications with the module.

Good luck.

oluwasefunmi · May 14, 2022, 12:28am

Thank you so much...
I used test code for it too, but it's still giving me question mark. I changed the sim800l to another one but same thing keep happening...
I will check the tutorial you sent to me, thank you so much

system · November 10, 2022, 12:29am

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I'm trying to build fire alarm system using GSM 800l

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