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Description
1 used for the family and the plant's gas leakage monitoring device, suitable for CO/ carbon monoxide gas 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 board digital switch output interface (0 and 1)
4 AO analog board output interface board

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