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Air Quality Monitoring System using Arduino Uno, MQ2 Sensor & 16×2 LCD (I2C) In this video, I show how I built a real-time Air Quality Monitoring System that measures air pollution levels using the MQ2 sensor. The Arduino Uno reads the analog value from the sensor and displays the air quality status (GOOD / MODERATE / POOR / DANGER) on a 16×2 ...
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