product description MQ-135 MQ135 Air Quality Sensor Arduino AVR Module Dangerous Gas Detection Module Applications: Probe for home, harmful gas detection device for ammonia, aromatic compounds, sulfur compounds, benzene vapor, flue gas and other harmful gases, gas sensitive components Concentration range: 10 ~ 1000ppm Module Features: 1. Using high-quality double-panel design, with power indicator and TTL signal output instructions; 2. Switch signal with DO (TTL) output and analog output AO; 3. TTL output valid signal is low. (Low level signal, the output light can be directly connected to the microcontroller or relay module) 4. The higher the voltage, the higher the analog output voltage. 5. Good air quality, harmful gases detection sensitivity. 6. There are four screw holes for easy positioning. 7 Product Size: 32 (L) * 20 (W) * 22 (H) 8 long life, stable and reliable 9. Fast response, fast recovery. Electrical properties: Input voltage: DC5V Power consumption (current): 150mA DO output: TTL number 0,1 (0.1 and 5V) AO output: 0.1-0.3V (relative to pollution), the maximum voltage 4V Special Note: After the sensor is powered on, you need to preheat about 20S, the measured data is stable, the thermal sensor is normal, because the internal heating wire, if the heat is not normal. wiring: 1. VCC: Positive supply (5V) 2. GND: negative power supply 3. DO: TTL switch signal output AO: Analog signal output Main chip: LM393, MQ-135 gas sensor High sensitivity, good selectivity, harmful to the air quality testing. Use DO switch signal (TTL) output and AO analog signal output Using high-quality double-panel design, with power instructions and TTL signal output instructions TTL output valid signal is low. (When the output low signal light, it can be directly connected to the microcontroller or relay module)
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