MQ-series-dat

• You can use arduino default "analogread" example to read the analog value from the sensor

• Wiring Example

• Arduino Breathalyzer

• Another Breathalyzer Design

• MQ-2-dat - STH1042-dat

• MQ-3-dat - STH1043-dat

• MQ-5-dat - STH1044-dat

Gas type and models

Selection Guide

Model	Detect Type
MQ-2	LPG, i-butane, propane, methane, alcohol, Hydrogen, smoke
MQ-3	Alcohol
MQ-5	High sensitivity to LPG, natural gas, town gas Small sensitivity to alcohol, smoke. Combustible gases: Butane, propane, methane, hydrogen

Note of use

Initiation check

• The sensor first warm-up for about 20 seconds.
• Put the sensor on a place without detecting gas,
• clockwise adjustment potentiometer until the light is on,
• then one-half turn counterclockwise until indicator does not light
• then close to the measured gas light is on, leave the measured gas, the light is off, this proof the sensor is working well

ref

obseleted

• Arduino Tutorial in Portuguese