MQ-7 Gas Sensor Module For Carbon Monoxide Detector Module
MQ-7 Gas Sensor Module For Carbon Monoxide Detector Module
The MQ-7 Gas Sensor Module is a highly sensitive and reliable detection module designed to detect Carbon Monoxide (CO) gas concentrations in the air. This module is specifically designed for use in CO detector systems, HVAC systems, and industrial control applications. The MQ-7 sensor is a metal oxide semiconductor (MOS) type gas sensor, which provides accurate and fast response to CO gas concentrations.
The MQ-7 Gas Sensor Module is designed to detect Carbon Monoxide gas concentrations in the air and provide an analog output signal proportional to the CO concentration. The module operates on the principle of catalytic combustion, where the CO gas reacts with the sensing material to produce a change in resistance. This change in resistance is then converted into an analog output signal, which can be used to trigger alarms, display CO concentrations, or control ventilation systems.
Metal Oxide Semiconductor (MOS)
10-1000 ppm CO
0.1-10 ppm/100mV
5V DC
<20mA
Analog voltage (0-5V)
<10 seconds
-10C to 50C
-20C to 70C
5-95% RH (non-condensing)
| The MQ-7 Gas Sensor Module is suitable for use in a wide range of applications, including |
Carbon Monoxide detectors
HVAC systems
Industrial control applications
Air quality monitoring systems
Security systems
Automotive applications
Medical devices
The MQ-7 Gas Sensor Module should be used in conjunction with a suitable CO detection circuit and a microcontroller or other electronic device to provide accurate CO concentration measurements and alarm functionality.
MQ-7 Gas Sensor Module for Carbon Monoxide Detector ModuleOverviewThe MQ-7 Gas Sensor Module is a highly sensitive and accurate sensor for detecting carbon monoxide (CO) concentrations in the air. This module is often used in gas detection systems, air quality monitoring, and safety alarm systems. The sensor module outputs an analog signal proportional to the CO concentration, making it easy to integrate with microcontrollers and other electronic devices.Pinouts and ConnectionsThe MQ-7 Gas Sensor Module typically has the following pinouts:VCC: Power supply pin (5V recommended)
GND: Ground pin
OUT: Analog output pinCharacteristics and SpecificationsOperating voltage: 5V
Operating temperature: -10C to 50C
Sensitivity: 1 ppm to 1000 ppm CO concentration
Output signal: Analog voltage (0-5V)
Response time: 10-30 secondsCode Examples### Example 1: Basic Analog Read with ArduinoThis example demonstrates how to read the analog output of the MQ-7 Gas Sensor Module using an Arduino board.```c++
const int sensorPin = A0; // Analog input pin for MQ-7 sensor
const int ledPin = 13; // Digital output pin for LED indicatorvoid setup() {
Serial.begin(9600);
pinMode(ledPin, OUTPUT);
}void loop() {
int sensorValue = analogRead(sensorPin);
float coConcentration = sensorValue (5.0 / 1023.0); // Convert to CO concentration (ppm)
Serial.print("CO Concentration: ");
Serial.print(coConcentration);
Serial.println(" ppm");if (coConcentration > 50) {
digitalWrite(ledPin, HIGH); // Turn on LED if CO concentration is above 50 ppm
} else {
digitalWrite(ledPin, LOW); // Turn off LED if CO concentration is below 50 ppm
}
delay(1000);
}
```### Example 2: Detecting CO Concentration Threshold with Raspberry Pi (Python)This example demonstrates how to use the MQ-7 Gas Sensor Module with a Raspberry Pi to detect when the CO concentration exceeds a certain threshold.```python
import RPi.GPIO as GPIO
import time# Set up GPIO pins
GPIO.setmode(GPIO.BCM)
sensorPin = 17 # Analog input pin for MQ-7 sensor
ledPin = 23 # Digital output pin for LED indicator# Set up the LED pin as an output
GPIO.setup(ledPin, GPIO.OUT)while True:
# Read the analog output of the MQ-7 sensor
sensorValue = GPIO.input(sensorPin)
coConcentration = sensorValue (5.0 / 1023.0) # Convert to CO concentration (ppm)if coConcentration > 100: # Set the threshold to 100 ppm
GPIO.output(ledPin, GPIO.HIGH) # Turn on the LED if CO concentration is above threshold
else:
GPIO.output(ledPin, GPIO.LOW) # Turn off the LED if CO concentration is below thresholdprint("CO Concentration: {:.2f} ppm".format(coConcentration))
time.sleep(1)
```Note: These code examples are for illustration purposes only and may require modifications to suit specific use cases and hardware configurations. Always ensure proper safety precautions when working with gas sensors and electronic components.