Avoid the noise of LPG, natural gas, coal gas. The sensitivity can be adjusted by the potentiometer.MQ-135 gas sensor applies SnO2 which has lower conductivity in the clear air as a gas-sensing material. In an atmosphere where there may be polluting gas, the conductivity of the gas sensor raises along with the concentration of the polluting gas increases
The sensitive materials of the MQ-135 gas sensor are benzene, alcohol, and smoke. When the target combustible gas exists, The sensor’s conductivity is higher along with the gas concentration rising. Please use a simple electro circuit, Convert the change of conductivity to the corresponding output signal of gas concentration.
Connections
VCC ↔ 2.5V ~ 5.0V
GND ↔ power supply ground
AOUT ↔ MCU.IO (analog output)
DOUT ↔ MCU.IO (digital output)
Applications
Air quality monitor
Features
Sensitive for benzene, alcohol, smoke
Output voltage boosts along with the concentration of the measured gases increases
Fast response and recovery
Adjustable sensitivity
Signal output indicator
Specification
| IC Chip | MQ-135 |
| Operating Voltage (VDC) | 2.5~5 |
| Detecting Range | Alcohol:10~300ppm Benzene:10~1000ppm NH3:10~300ppm |
| Length (mm) | 40 |
| Width (mm) | 20 |
| Height (mm) | 16 |
| Weight (gm) | 7 |
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