2Pcs MQ3 Alcohol Gas Sensor Module, Ethanol Detector Breath Gas DoubleSided Circuit Detection Board with Power Indicator TTL Signal Output Indicator

Detailed Test Parameters: Model: MQ-3 Detecting gas: alcohol vapor Detection concentration: 0.04-4mg/L alcohol Standard circuit condition: Loop voltage VC ?24DC Heating voltage :VH 5.0±0.2V AC/DC Load resistance: RL adjustable Gas sensor characteristics under standard test condition: Heating resistor 31?±3? Heating power consumption: ?90mW Sensitive surface resistance: 2K?-20K? (in 0.4mg/L alcohol) Sensitivity: Rs (in air) / Rs (0.4mg / L alcohol) ? 5 Concentration slope: ?0.6 (R300ppm/R100ppm alcohol) Standard test conditions: 20?±2?; 65%±5% RH Standard test circuit: 5.0V ± 0.1V Warm-up time: ?48 hours Electrical Properties: Input voltage: DC5V Power consumption (current ): 150mA DO output: TTL digital 0 and 1 ( 0.1 and 3.3V) AO output: 0.1-0 .3V,  the highest concentration voltage is about 4V Wiring: 1. VCC: connected to the positive pole of the power supply 2. GND: connected to the negative power supply 3. DO: TTL switching signal output 4. AO: analog signal output Package list: 2 x Alcohol Gas Sensor