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The code first checks if the concentration of harmful gases is not safe, if so, it gives a fast buzzer warning (250 ms between sound warnings) . If not, it checks if the level is close to being ...

Abstract: This paper presents the development of a cost-effective, solar-powered, real-time air quality monitoring and hazard alert system utilizing an Arduino microcontroller integrated with gas and ...

The project illustrates how an Arduino board was interfaced with MQ-3 Alcohol Gas Sensor to create the Breathalyzer. One ADC input of Arduino is required to obtain the simple connection of the sensor.