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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.

mq7 circuit diagram Gallery


mq7 circuit diagram

mq7 circuit diagram

mq7 circuit diagram

mq7 circuit diagram

internet of things march 2014

internet of things march 2014

circuit board diagram diagram auto wiring diagram

circuit board diagram diagram auto wiring diagram

gas sensor module circuit diagram

gas sensor module circuit diagram

keypad controlled and industrial gas monitoring wireless

keypad controlled and industrial gas monitoring wireless

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