Arduino Smoke Alarm

Equipped with the mighty Arduino Uno and a suite of essential components like the MQ2 Smoke Sensor Module and Buzzer, we venture into the heart of the circuit diagram. Unlock the secrets of the MQ2 Alcohol Sensor, a gas sensor module designed to detect an array of flammable gases, including smoke, with remarkable sensitivity and response time. Embark on a journey of understanding as we illuminate the inner workings of this powerful sensor, unveiling its ability to safeguard against potential hazards.

1. Alarm Mechanism: When a smoke detector senses smoke particles in the air, it triggers an alarm to warn occupants. The alarm mechanism typically involves a loud audible sound, often in the form of a loud siren or beep, to quickly grab attention and prompt evacuation.

2. Sound Intensity and Patterns: Smoke detector alarms produce high-decibel sounds to ensure they are heard even in noisy environments or when individuals are asleep. The sound intensity typically ranges from 85 decibels (dB) to 120 dB, depending on the specific model and regulations.

3. Power Source: Smoke detector alarms can be powered by batteries or be hardwired into the building's electrical system. Battery-powered alarms offer flexibility and can operate even during power outages, while hardwired alarms are directly connected to the electrical supply and may include battery backup.

4. Additional Features: Modern smoke detector alarms may incorporate additional features such as voice alerts, LED indicators, and wireless interconnectivity. Voice alerts can provide specific information about the type and location of the potential hazard, while interconnectivity allows multiple alarms to communicate with each other, triggering all alarms simultaneously in case of smoke detection in any area of the building.

Components Required:

1. MQ2 Smoke sensore module
2. Arduino Uno
3. 16X2 LCD
4. Buzzer
5. 5V DC power supply

MQ2 Smoke sensor:

The MQ2 Smoke Sensor is a gas sensor module commonly used to detect a variety of flammable gases, including smoke and combustible gases. Here are some details about the MQ2 smoke sensor:

How it works: The MQ2 smoke sensor works on anti-sensory sensors. It is made of metal oxide semiconductor material. Chemical reactions in the presence of smoke or other gases make the material sensitive, causing its electrical properties to change. The sensors detect the presence and concentration of smoke or other fumes by measuring changes in electrical resistance.
sensitivity: The MQ2 smoke sensor has a high sensitivity to smoke and a wide detection range for various combustible gases.
Analog Output: The sensor provides an analog voltage output proportional to the detected gas concentration. This voltage can be read by a microcontroller or other monitoring device for further processing and decision making.
Fast Response Time: The MQ2 sensor has a fast response time that increases the time to monitor and detect smoke or oil. Warm-up time: Sensors usually need to warm up for several minutes to give an accurate reading.

Circuit diagram:

Code:

#define S 8// Alcohol Sensor 
#define B 9
#include 
LiquidCrystal lcd(2,3,4,5,6,7);
 void setup() 
{
  Serial.begin(9600);
  lcd.begin(16, 2);
 pinMode(S,INPUT);
 pinMode(B,OUTPUT);
 lcd.setCursor(0,0);
 lcd.print("ROBOTSHAPERS");
 delay(1500);
 lcd.setCursor(0,0);
 lcd.print("SMOKE SENSOR");
 delay(1500);
 lcd.clear();
}
 
void loop()
{
if (digitalRead(S)== HIGH)
{
  lcd.setCursor(0,0);
 lcd.print("SMOKE DETECTED");
 digitalWrite(B,HIGH);
 delay(500);
  digitalWrite(B,LOW);
 delay(500);
 
}
if (digitalRead(S)== LOW)
{
  lcd.setCursor(0,0);
 lcd.print("HOUSE SAFE    ");
 digitalWrite(B,LOW);
}
}

Applictions:

1. MQ2 smoke sensor is widely used in many areas including fire detection systems, gas leak detection systems, smoke alarms and environmental monitoring.
2. It is often used in homes, businesses and home businesses to provide early warning of fire hazards and increase safety. 
3. MQ2 smoke sensor is designed to detect smoke and flames, but does not provide specific information about the exact composition or nature of the smoke detected. 

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