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in Arduino by
Q:

If the PPM concentration of a gas that is being detected by the MQ2 Gas Sensor increases what will happen to its Digital Output pin?

(a) Voltage Increases

(b) Voltage Decreases

(c) Voltage becomes 0

(d) Voltage doesn’t change

1 Answer

0 votes
by

Right answer is (d) Voltage doesn’t change

Explanation: The MQ2 Gas Sensor has two output pins, one is digital and one is analog. The digital pin can only vary between two voltage levels which corresponds to 2 Logic Levels, 1 and 0 or 5V and 0V respectively. So if a gas is present then the digital output becomes 5V but cannot detect any kind of change in concentration of the gas.

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