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MQ3 sensor shell has blue or orange, randomly to send.

Description
1 used for the family and the plant's gas leakage monitoring device, suitable for alcohol detection
2 adjustable sensitivity (blue digital chart potentiometer adjustment)
3 working voltage 5V, before use, power supply warm up for at least 2 minutes or more, sensor slightly hot is a normal phenomenon
4 output forms: analog voltage output; digital output (0 and 1)
5 provided with fixing bolt holes, easy to install
6 PCB size: 4.5cm * 1.8cm

Interface description (4 wire)
1 VCC 5V working voltage
2 GND external GND
3 DO small digital switch output interface (0 and 1)
4 AO analog output interface board

Instructions for use
1 MQ-2 sensors are most sensitive to the environment of alcohol gas.
2 module or alcohol gas concentration does not exceed a set threshold in the absence of alcohol gas, digital interface DO port output high level, simulation interface A0 voltage is about 0V, when the effects of alcohol gas exceeds the preset threshold, module interface D0 digital output low voltage analog interface, A0 output will slowly increase with the effects of the gas
3 small board digital output D0 can be directly connected with the MCU, the MCU to detect high level, thereby to detect alcohol gas
4 small board digital output DO can directly drive the relay module, which can be composed of an alcohol gas switch
5 small board digital output DO can directly drive the active buzzer module, which can form a gas alarm alcohol
6 small board analog output can be connected to AO and the AD module, through the AD conversion, can obtain numerical environment alcohol gas concentration accurately