-20C to 50C
-20C to 50C
20% to 80% RH
4V to 6V
15mA typical
Analog voltage (0-5V)
60 seconds typical
350ppm to 10,000ppm
5% of full scale
Pinout and Dimensions
| The MG811 Carbon Dioxide Sensor module typically has a 5-pin interface, with the following pinout |
Power supply (4V to 6V)
Ground
Analog output signal
Not connected
The module dimensions are typically 25mm x 20mm x 10mm.
Safety Precautions
Handle the sensor with care to avoid damaging the gas-permeable membrane.
Avoid exposing the sensor to extreme temperatures, humidity, or contamination.
Follow proper soldering and assembly procedures to avoid damaging the sensor.
Ensure proper ventilation when using the sensor in enclosed environments.
MG811 Carbon Dioxide Sensor For Carbon Dioxide Detector Module DocumentationOverviewThe MG811 Carbon Dioxide Sensor is a low-power, high-accuracy gas sensor designed to detect carbon dioxide (CO2) concentrations in air. This sensor module is widely used in various applications, including industrial control, air quality monitoring, and indoor climate control. The MG811 sensor operates on the principle of Non-Dispersive InfraRed (NDIR) technology, providing accurate and reliable CO2 measurements.Pinout and WiringThe MG811 Carbon Dioxide Sensor module typically has the following pinout:VCC: Power supply (typically 5V)
GND: Ground
OUT: Analog output signal (voltage proportional to CO2 concentration)Code Examples### Example 1: Basic CO2 Measurement with ArduinoIn this example, we'll use an Arduino Uno board to read the CO2 concentration from the MG811 sensor and display it on the serial monitor.
```c
const int sensorPin = A0; // Analog input pin for MG811 sensorvoid setup() {
Serial.begin(9600);
}void loop() {
int sensorValue = analogRead(sensorPin);
float voltage = sensorValue 5.0 / 1023.0;
float co2ppm = voltage 500.0 / 5.0; // Conversion factor: 1V = 500ppm CO2
Serial.print("CO2 Concentration: ");
Serial.print(co2ppm);
Serial.println(" ppm");
delay(1000);
}
```
### Example 2: CO2 Monitoring with Raspberry Pi and PythonIn this example, we'll use a Raspberry Pi board to read the CO2 concentration from the MG811 sensor and display it on a web interface using Flask.
```python
import RPi.GPIO as GPIO
import time
from flask import Flask, render_templateapp = Flask(__name__)# Set up GPIO pins for MG811 sensor
GPIO.setmode(GPIO.BCM)
sensor_pin = 17
GPIO.setup(sensor_pin, GPIO.IN)@app.route("/")
def index():
sensor_value = GPIO.input(sensor_pin)
voltage = sensor_value 5.0 / 1023.0
co2ppm = voltage 500.0 / 5.0 # Conversion factor: 1V = 500ppm CO2
return render_template("index.html", co2ppm=co2ppm)if __name__ == "__main__":
app.run(debug=True)
```
`index.html` file:
```html
<!DOCTYPE html>
<html>
<head>
<title>CO2 Monitor</title>
</head>
<body>
<h1>CO2 Concentration: {{ co2ppm }} ppm</h1>
</body>
</html>
```
### Example 3: CO2 Alarm System with ESP32 and MicroPythonIn this example, we'll use an ESP32 board to read the CO2 concentration from the MG811 sensor and trigger an alarm when the CO2 level exceeds a set threshold.
```python
import machine
import utime# Set up pins for MG811 sensor
sensor_pin = machine.Pin(32, machine.Pin.IN)# Set CO2 threshold (ppm)
co2_threshold = 1000def read_co2():
sensor_value = sensor_pin.value()
voltage = sensor_value 5.0 / 1023.0
co2ppm = voltage 500.0 / 5.0 # Conversion factor: 1V = 500ppm CO2
return co2ppmwhile True:
co2ppm = read_co2()
if co2ppm > co2_threshold:
print("CO2 level too high! ({:.0f} ppm)".format(co2ppm))
# Trigger alarm (e.g., buzzer, LED, etc.)
utime.sleep(1)
```
Note: In all examples, ensure that the MG811 sensor is properly calibrated and the conversion factor is adjusted according to the manufacturer's specifications. Additionally, the CO2 threshold values and alarm triggers can be customized to suit specific application requirements.