MG811 CO2 Carbon Dioxide Sensor - (AD14214)

Description:

This sensor is designed to capture CO2 in the environment. "Carbon dioxide is a colorless, odorless gas that is vital to life on Earth. This naturally occurring chemical compound is composed of a carbon atom bonded by double covalent bonds to two oxygen atoms. CO2 exists in the Earth's atmosphere as a trace gas at a concentration of about 0.04% (400 ppm) by volume. Natural sources include volcanoes, hot springs, geysers, and it is released by carbonate rocks when diluted with water and acids. Since CO2 is soluble in water, it occurs naturally in groundwater, rivers, lakes, ice fields, glaciers, and seas.

And this tutorial focuses on this sensor, as it's the most frequently mentioned commercial sensor. Even though there are few Arduino applications, and even fewer tutorials in Spanish.

This sensor (the gray one) along with the module (all the others) contains a circuit to amplify or adjust the sensitivity depending on the environment where it will be used. It has a transducer with an adjustable threshold and an analog output, which the microcontroller will read. This sensor can read concentrations from 350 to 100,000 parts per million.

Sensor Features:

- Voltage 5v or more.

- Digital output DO (comparator)

- Analog output AO (amplifier)

- Temperature comparator output

- Potentiometer to adjust amplification

- Potentiometer for comparator adjustment

- Weight 10 g

- The sensor becomes warm and can be felt by touch. The voltage increases until it levels off. Once the sensor is warm, it's ready to detect CO2.

- The analog output has a range of 0 to 2v, the higher the output voltage, the lower the gas concentration, for more information check the data sheet.

- When the ambient temperature changes the output voltage also varies, and the CO2 sensor at a higher temperature detection more effective.

Reference link: