DIY Arduino Smoke Detector Shield using MQ2 Gas Sensor
We built a Smoke Detector Circuit using Arduino and MQ2 gas sensor, which not only sense the smoke in the air but also reads and displays the level of Smoke in the Air in PPM and start the buzzer if it goes beyond the threshold.Cheap CO2 meter using the MQ135 sensor with AVR ATmega
The description below, is what i derive from the poor datasheet of this sensor, it may be uncorrect, so if you have suggestions please leave me a feedback.
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