MQ135 Gas sensor

The MQ135 module is a versatile air quality sensor designed to detect a wide range of gases, including ammonia, nitrogen oxide, alcohol, benzene, smoke, and carbon dioxide. This module is widely used in air quality control systems, environmental monitoring, and various gas detection applications. It is easy to integrate with microcontrollers and development boards for real-time air quality monitoring. 
Key Features:

• Wide Range Gas Detection: Detects ammonia, nitrogen oxide, alcohol, benzene, smoke, and carbon dioxide
• High Sensitivity: Provides accurate and reliable gas concentration readings
• Analog Output: Easy integration with microcontrollers and development boards
• Durable Design: Long-lasting performance for continuous air quality monitoring
• Compact Size: Suitable for various applications and environments

Technical Specifications:

• Sensor Type: Semiconductor
• Operating Voltage: 5V
• Detection Range: 10-1000 ppm (varies by gas type)
• Preheat Time: 20 seconds
• Analog Output: 0-5V
• Digital Output: TTL level
• Operating Temperature: -20°C to +50°C

Applications:

• Air quality monitoring systems
• Environmental monitoring
• Industrial safety systems
• Gas detection devices
• Smart home applications

Usage:

1. Connect the MQ135 module to a 5V power supply.
2. Interface the analog output to an analog input pin of a microcontroller.
3. Read the analog voltage value corresponding to the gas concentration.
4. Use the sensor's digital output for threshold-based detection if needed.
5. Implement the necessary code to process and display air quality data.

Caution:

• Ensure the module is used within its specified voltage and temperature limits.
• Handle with care to avoid damage to the sensor and module components.
• Avoid exposure to extreme conditions that may affect sensor performance.

Datasheet: For more detailed technical information, refer to the MQ135 Module Datasheet.