• High quality double panel design, with power indicator and TTL output signal.
• Have DO switch signal(TTL) output and AO analog signal output.
• TTL output signal for low level effectively. (when the low output electric signal lights at ordinary times, can be directly connect single chip microcomputer or relay module)
• Analog output voltage with concentration, the higher concentration, the higher voltage.
• Has better sensitivity with the liquefied petroleum gas, natural gas, city gas, smoke.
• Has long service life and reliable stability
• Rapid response recovery features

• Input voltage : DC5V
• Power consumption (current) : 150 mA
• DO output : TTL digital 1 and 0 (0.1 and 5 V)
• AO output : 0.1-0.3 V (pollution-free)
• Highest concentration of voltage : Approx 4 V
• Detection range of alcohol : detection range of 10 ~ 1000 PPM

Connection mode:

• VCC : Positive (5 v)
• GND : Connect power negative
• DO : TTL switch signal output
• AO : Analog signal output

1. Datasheet - MQ3 GAS SENSOR