MQ135 Air Quality Control Gas Sensor Module (NH3, NOx, Alcohol, Benzene, Smoke and CO2)

• High sensitivity to butane, propane, methane
• The reference concentration can be adjusted by the blue potentiometer, clockwise to reduce the reference concentration, counter-clockwise rotation, the reference concentration
• The Heating Voltage: 5 ± 0.2V (AC · DC)
• The Working Current: 150ma
• The Loop Voltage: < DC15V (Maximum DC15V)
• The Load Resistance: 1K (Adjustable)
• The Detection Concentration Range: 100-20000ppm (Different Concentrations of Different Gas Ranges)
• Clean the Air Voltage: < 1.5V
• The Sensitivity: < 3%
• The Response Time: < 1S (Warm-Up 3-5 Minutes)
• Response Time: < 30S
• Component Power Consumption: < 0.9W
• The Working Temperature: -10 ~ 50 ° (Nominal Temperature 20 °)
• The Working Humidity: 95% RH (Nominal Humidity 65% RH)

Pin Definition

• VCC: Connect 5V power supply positive pole
• DOUT: digital signal output, you can directly access the MCU IO port
• AOUT: analogue signal output, AD converter can be connected to the input port in order to calculate the specific concentration of gas value
• GND: 5V power supply negative