Description: 1. Overview: MQ-135 is a gas sensor module capable of detecting various gases, including ammonia (NH3), alcohol, benzene, smoke, and CO2. It's an ideal component for IoT projects involving gas sensing applications. 2. Design: The module features a circular PCB design with four sensing electrodes and a heater element encapsulated in a protective ceramic material. This design ensures durability and resistance to harsh environmental conditions. 3. Functionality: The MQ-135 sensor utilizes the principle of conductive gas sensing. When a specific gas is detected, it reacts chemically with the sensing element, changing its electrical conductivity. 4. Gas Sensitivity: This module exhibits high sensitivity towards different gases, enabling rapid detection and response times. For instance, it can detect ammonia at concentrations as low as 1 ppm. 5. Operating Conditions: The MQ-135 sensor operates between the temperature range of 20°C to 80°C (68°F to 176°F) and has an optimal operating hum
| Specification | Details |
|---|---|
| Sensor Type | MQ-135 Air Quality Sensor |
| Detection Gas | NH3 (Ammonia) Alcohol Benzene CO2 |
| Operating Voltage | 5V DC |
| Power Consumption | 30mA @ 5V |
| Sensitivity | Adjustable (POT) |
| Temperature Range | -20°C to 50°C |
| Humidity Range | 0-80% relative humidity |
| Response Time | 10 seconds |
| Accuracy | ±3% |
| Output Type | Analog (0-5V) |
