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The 8x8 Dot Matrix Display module consists of the 8x8 LED matrix display and the MAX7219 driver IC connected to it
The base current of this transistor is about 1
to provide power supply during power down
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MQ-7 Gas Sensor Module for Carbon Monoxide M20 The 8x8 Dot Matrix DisplayMQ7 Gas sensor is another one of Metal Oxide Semiconductor (MOS) type Gas Sensor of MQ Gas Sensors family involving MQ 2, MQ 4, MQ 3, MQ 8, MQ 135, etc. It is mainly used to detect Carbon Monoxide. This sensor contains a sensing element, mainly aluminum oxide based ceramic, coated with Tin dioxide (SnO2), enclosed in a stainless steel mesh. Whenever CO gas comes into contact with the sensing element, the resistivity of the element changes. The change
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