HiLetgo MQ135 MQ-135 Air Quality Sensor Hazardous Gas Detection Sensor Module For Arduino Environmental Measurement

HiLetgo MQ135 MQ-135 Air Quality Sensor Hazardous Gas Detection Sensor Module For Arduino Environmental Measurement

<b>MQ-135 MQ135 Air Quality Sensor Hazardous Gas Detection Module For Arduino AVR</b> <br> <b>Module Applications: </b> <br> Probe for home, environmental harmful gas detection device, suitable to ammonia , aromatic compounds , sulfur compounds , benzene vapor , smoke and other gases harmful gases , the gas sensitive element concentration range : 10 to 1000ppm <br> <b>Module Features: </b> <br> 1. Using high-quality dual-panel design, with power indicator and TTL signal output instructions; <br> 2. The switching signal having a DO (TTL) output and analog output AO; <br> 3. TTL output valid signal is low. ( Low-level signal when the output light can be directly connected to the microcontroller or relay module ) <br> 4. The higher the voltage , the concentration of the analog output voltage is higher. <br> 5. Air quality, hazardous gas detection with good sensitivity. <br> 6. There are four screw holes for easy positioning; <br> 7 Product dimensions: 32 (L) * 20 (W) * 22 (H) <br> 8. Has a long life and reliable stability <br> 9. Rapid response and recovery characteristics. <br> <b>Electrical properties: </b> <br> Input voltage: DC5V Power consumption ( current ): 150mA <br> DO output: TTL digital 0 and 1 ( 0.1 and 5V) <br> AO output :0.1-0 .3 V ( relative to pollution ) , the maximum concentration of a voltage of about 4V <br> Special note: After the sensor is powered , needs to warm up around 20S, measured data was stable, heat sensor is a normal phenomenon , because the internal heating wire , if hot is not normal. <br> Wiring: <br> 1. VCC: positive power supply (5V) <br> 2. GND: power supply is negative <br> 3. DO: TTL switching signal output <br> 4. AO: analog signal output <br>