MQ-2 smoke sensor module
This is the MQ-2 smoke sensor module. It is sensitive to flammable gases such as LPG, propane, and methane.
It has four pins:
AO: Analog Output
DO: Digital Output
GND: In electronics, we define a point in a circuit to be a kind of zero volts or 0V reference point, on which to base all other voltage measurements. This point is called  ground or GND.
3.3V Â : While 'VCC' stands for Voltage Common Collector, we'll connect the VCC pin to 3.3V on the micro:bit
Voltage is the difference in potential between two points. As it is difficult to talk about voltage without a reference point, we need another point to compare it to.
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Description
This is the MQ-2 smoke sensor module. It is sensitive to flammable gases such as LPG, propane, and methane.
It has four pins:
AO: Analog Output
DO: Digital Output
GND: In electronics, we define a point in a circuit to be a kind of zero volts or 0V reference point, on which to base all other voltage measurements. This point is called  ground or GND.
3.3V Â : While 'VCC' stands for Voltage Common Collector, we'll connect the VCC pin to 3.3V on the micro:bit
Voltage is the difference in potential between two points. As it is difficult to talk about voltage without a reference point, we need another point to compare it to.
