Gas Detector

A gas detector using a Nodemcu module typically involves connecting a gas sensor to the Nodemcu board, which is programmed to monitor gas levels. The Nodemcu collects data from the sensor and can send alerts or notifications if gas levels exceed safe limits. This setup can be used for various applications such as detecting carbon monoxide, methane, or other hazardous gases in homes, industrial settings, or laboratories. The Nodemcu Wi-Fi capabilities may also enable remote monitoring and control of the gas detection system.

A gas detector using a Nodemcu module has a wide range of uses, including:

Home Safety: Detecting carbon monoxide (CO) or natural gas leaks to ensure the safety of residents.

Industrial Safety: Monitoring gas levels in factories, warehouses, or industrial facilities to prevent accidents and ensure worker safety.

Environmental Monitoring: Detecting pollutants or harmful gases in the environment to assess air quality.

Laboratory Applications: Monitoring gas levels in laboratories to ensure a safe working environment for researchers.

HVAC Systems: Integrating gas detection into heating, ventilation, and air conditioning systems to ensure proper ventilation and prevent gas buildup.

Smart Buildings: Incorporating gas detection into smart building systems for automated alerts and responses to gas leaks or unsafe conditions.

Fire Prevention: Early detection of flammable gases to prevent fires or explosions in both residential and commercial settings.

 Circuit Diagram :-

Project Code :-

//Change Blynk Authenticaation Details
#define BLYNK_DEVICE_NAME "Gas Detection Alert"
#define BLYNK_AUTH_TOKEN "fRiTEoa3v1QV9UDShh4gtfgbs34oM81i"

#define BLYNK_PRINT Serial
#include <ESP8266WiFi.h>
#include <BlynkSimpleEsp8266.h>

char auth[] = BLYNK_AUTH_TOKEN;

char ssid[] = "Wifi Name";  // Enter your wifi name
char pass[] = "Wifi Password";  // Enter your wifi password
int smokeA0 = A0;
int data = 0;
int sensorThres = 100;

BlynkTimer timer;

void sendSensor(){
 int data = analogRead(smokeA0);
 Blynk.virtualWrite(V0, data);
  Serial.print("Pin A0: ");

  if(data > 999)     // Change the Trashold value
  {"", "Alert", "Gas Leakage Detected!");
    Blynk.logEvent("gas_alert","Gas Leakage Detected");

void setup(){
  pinMode(smokeA0, INPUT);
  Blynk.begin(auth, ssid, pass);
  timer.setInterval(2500L, sendSensor);

void loop(){;;

Components :-

a person holding a small device in front of a laptop


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MQ - 2 Gas Sensor

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Jumper Wires

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Note :-

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Plant Monitoring System