Prototype of a Human Breath Alcohol Detection Device Using Three MQ Sensors Based on a Microcontroller
DOI:
https://doi.org/10.59890/ijatss.v3i11.121Keywords:
Breath Alcohol Detection, ESP32, MQ3/MQ2/MQ7 Sensors, IOT, Real-Time Monitoring, Google Sheets, Telegram NotificationsAbstract
Alcohol consumption is a major contributor to road traffic accidents, a portable, affordable, real-time breath screening device is needed. This study designs and evaluates a microcontroller-based detector using MQ3, MQ2, and MQ7 sensors with IoT logging and alerts. An ESP32 reads sensor outputs, converts them to ppm via linear calibration, compares them with a Digital Breath Alcohol Tester (20 trials per sensor), and triggers a buzzer/Telegram notifications while sending data to Google Sheets. The system operated reliably with low error against the reference device (0.5–4.4%), MQ3 was the most accurate and stable. The prototype is feasible and effective. MQ3 is recommended, future work includes larger datasets and temperature-humidity compensation
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