# Gas Sensor MQ-4 Methane Natural Gas

> MQ-4 gas sensor module for detecting methane and natural gas, based on an SnO2 sensor. Power supply 5VDC, 150mA. Detects concentrations between 300-10000ppm. Provides an analog output 0-5V proportional to concentration and a digital TTL output with adjustable threshold. Easy to integrate into Arduino projects via A0 pin reading, suitable for gas leak monitoring systems.

- Page: https://sigmanortec.ro/en/gas-sensor-mq-4-methane-natural-gas
- Price: 9.98 RON
- Availability: In stock; 1-2 zile
- Reference: 22133 · EAN: 5945116496291
- Category: Mechatronics and IoT > Sensors and Modules > Gas and Air Quality Sensors
- Package (shipping data): 0.008 kg
- Updated: 2026-09-14
- Shop: [Sigmanortec.ro](https://sigmanortec.ro/en/llms.txt)
- Prices: RON, VAT included; prices and stock as of 2026-10-22 03:26 (Europe/Bucharest)

## Description

Methane and natural gas detection module, ideal for Arduino projects and leak monitoring systems. Operates at 5V, SnO2 sensor with good sensitivity in the range of 300-10000ppm, offers 0-5V analog output proportional to concentration and TTL digital output for settable thresholds, easy to integrate by reading on A0.
MQ4 sensor used to detect natural gas and methane.
Specifications:
The gas sensor is Tin Dioxide (SnO2) with low conductivity in clean air.
Supply voltage: 5VDC, 150mA
Detected concentration: 300 - 10000ppm
Output: Digital pin or Analog pin
Analog output: 0 - 5V; the voltage increases or decreases depending on the detected concentration
TTL Digital Output
Analogue reading code example:
void setup() {
// initialize serial communication at 9600 bits per second:
Serial.begin(9600);
}
// the loop routine runs over and over again forever:
void loop() {
// read the input on analog pin 0:
int sensorValue = analogRead(A0);
// print out the value you read:
Serial.println(sensorValue);
delay(1); // delay in between readings for stability
}