Smoke Level Detector with Alarm

The level of Smoke in our Surrounding because of combustion. So, We can sense the amount of smoke and generate an alert signal.

BeginnerFull instructions provided1 hour15,360

Things used in this project

Hardware components

Arduino UNO

Seeed Studio Grove - Gas Sensor(MQ2)

Buzzer

LED (generic)

Jumper wires (generic)

Resistor 330 ohm

Adafruit RGB Backlight LCD - 16x2

USB-A to B Cable

Breadboard (generic)

Software apps and online services

Arduino IDE

Story

Hardware Connections

A. Connecting LED

The -ve terminal of the LED is connected to the GND pin of Arduino UNO.
Take +ve terminal of the LED and warp it with the one terminal of 330 ohm resistor.
Connect the other terminal of the resistor with the GPIO pin 10 of Arduino UNO.

B. Connecting MQ sensor

The 4 pins of MQ sensor ie., VCC, GND, AOUT, DOUT. We have to connect GND and VCC pin of MQ sensor to GND and 5V pin of Arduino respectively.
the DOUT pin of MQ sensor is connected to the A0 pin of Arduino.

C. Connecting LED Display

There are 16 pins in the LED Display. Connect pin 1, 3, 5, 16 to the GND pin of the Arduino.
Connect pin 2 and 15 of LED Display to the 5V pin of the Arduino.
Connect pin 4 of Display to D7, pin 6 to D6, pin 11 to D5, pin 12 to D4, pin 13 to D3, pin 14 to D2 of the Arduino.

D. Connecting Buzzer

Connect the -ve terminal of the buzzer to the GND pin of the Arduino.
Connect the +ve terminal of the Buzzer to D8 pin of the Arduino.

NOTE: Connect all components on a Breadboard without connecting to power supply or performing any cross check. It may cause damage to the components.

Code

Arduino Code of Smoke Detector

#include <LiquidCrystal.h>
LiquidCrystal lcd(7, 6, 5, 4, 3, 2);

int redLed = 10;
int greenLed = 12;
int buzzer = 8;
int smokeA0 = A0;
// Your threshold value
int sensorThres = 100;

void setup() {
  pinMode(redLed, OUTPUT);
  pinMode(buzzer, OUTPUT);
  pinMode(smokeA0, INPUT);
  Serial.begin(9600);
  lcd.begin(16,2);
}

void loop() {
  int analogSensor = analogRead(smokeA0);

  Serial.print("Pin A0: ");
  Serial.println(analogSensor);
  lcd.print("Smoke Level:");
  lcd.print(analogSensor-50);
  // Checks if it has reached the threshold value
  if (analogSensor-50 > sensorThres)
  {
    digitalWrite(redLed, HIGH);
    lcd.setCursor(0, 2);
    lcd.print("Alert....!!!");
    digitalWrite(12, LOW);
    tone(buzzer, 1000, 200);
  }
  else
  {
    digitalWrite(redLed, LOW);
    digitalWrite(12, HIGH);
    lcd.setCursor(0, 2);
    lcd.print(".....Normal.....");
    noTone(buzzer);
  }
  delay(500);
  lcd.clear();
}

Credits

Mayank Mohan

2 projects • 2 followers

Smoke Level Detector with Alarm