Overview
The MQ-135 Air Quality Sensor is a versatile device used to detect a range of gases in the environment. It is particularly sensitive to harmful gases, making it a valuable tool for air quality monitoring. Whether you are a student working on a science project or a professional developing an IoT application, this sensor provides reliable data for assessing air quality.
What's in the box
- MQ-135 Air Quality Sensor
- Connecting wires
- User manual
Key features
- Detects a variety of gases including ammonia, benzene, and smoke
- Analog output for easy integration with microcontrollers
- Fast response time for real-time monitoring
- Compact size for easy installation
- Wide voltage range for compatibility with various power sources
- Durable construction for long-term use
How it works
The MQ-135 sensor works by measuring the concentration of gases in the air. It uses a sensitive material that changes resistance based on the gas concentration. This change in resistance is converted to an analog voltage output, which can be read by a microcontroller for further processing. The sensor is calibrated to provide accurate readings for different gases, ensuring reliable performance in various environments.
Getting started
- Connect the MQ-135 sensor to your microcontroller using the provided wires.
- Power the sensor with a suitable voltage (5V recommended).
- Read the analog output from the sensor using an analog input pin on your microcontroller.
- Process the output data to determine the concentration of gases in the air.
- Implement any additional features or logging as needed for your project.
Wiring / connections
Connect the MQ-135 sensor as follows:
- VCC to the positive voltage supply (5V)
- GND to ground
- AOUT to an analog input pin on your microcontroller
Tips & troubleshooting
- Ensure proper calibration for accurate gas concentration readings.
- Allow the sensor to warm up for a few minutes before taking measurements.
- Check connections if the sensor does not respond or provides erratic readings.
Safety notes
While the MQ-135 sensor is designed to detect gases, it is important to handle it with care and ensure it is used in a safe environment. Avoid exposure to extreme temperatures and humidity, which may affect sensor performance.
