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MQ135 Gas Sensor Pin Diagram:
Dual output: Analog and Digital signals
output 5V for many digital devices
it closes the circuit and the digital pin of the module that is connected to the LM393 IC goes high
4 AA Battery Holder IR Sensor MQ135 Gas Sensor Pin Diagram:4 AA Battery Holder This 4 x 1. 5V AA Battery Holder can hold 4 1. 5VAA battery which can make 9 V rechargeable battery pack from NiMH NiCd cells or 9V battery pack from alkaline cells. The battery holder puts the batteries in series so that you have 4x the voltage of an AA battery. Package Include: 1 x 4 AA Battery Holder
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