MQ135 Sensor

The MQ135 sensor is a highly sensitive gas sensor designed for detecting a range of gases in the environment, including ammonia, carbon dioxide, benzene, alcohol, and smoke. Its robust design and high sensitivity make it an excellent choice for air quality monitoring applications.

Overview

The MQ135 sensor utilizes a metal oxide semiconductor (MOS) as its sensing element, which reacts to the presence of various gases by altering its resistance. This change in resistance is then measured to determine the concentration of gases. The sensor features a wide detection range and is capable of detecting low to high levels of gases, making it versatile for various applications.

Key Features

• Wide Detection Range: Capable of detecting multiple gases such as ammonia (NH3), carbon dioxide (CO2), benzene (C6H6), alcohol (C2H5OH), and smoke.
• High Sensitivity: Offers high sensitivity and accuracy, making it suitable for precise air quality monitoring.
• Analog Output: Provides an analog voltage output proportional to the gas concentration, which can be read by an analog-to-digital converter (ADC) on a microcontroller.
• Heating Element: Includes a built-in heating element that helps in the sensor’s activation and ensures stable readings over time.
• Compact Design: Features a compact size, allowing easy integration into various devices and systems.

Applications

1. Air Quality Monitoring: Used in systems for monitoring indoor and outdoor air quality by detecting harmful gases and pollutants.
2. Environmental Testing: Useful in environmental testing for assessing air quality in different settings, including industrial and residential areas.
3. Home Automation: Can be integrated into home automation systems to monitor and control air quality, triggering alarms or ventilation systems when gas levels exceed thresholds.

Usage

To use the MQ135 sensor, connect it to a microcontroller or a sensor interface board. The sensor requires a warm-up period to stabilize, typically around 24 to 48 hours. During operation, the sensor’s output can be calibrated and adjusted based on the specific application and gas types being detected.

Calibration

For accurate readings, the MQ135 sensor needs to be calibrated regularly. This involves comparing the sensor output against known concentrations of gases and adjusting the readings accordingly.

In summary, the MQ135 sensor is a versatile and sensitive tool for detecting a variety of gases, making it an essential component for air quality monitoring systems and environmental testing applications.

Air Pump