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An alcohol concentration detector based on STC89C52 is presented. The detector, adopting a single chip microcomputer, STC89C52, as its controlling unit, collects samples of alcohol concentration via a gas sensor MQ3 and ambient temperature via a temperature sensor DS18B20, displays the results on an LCD, and judges whether drivers are drunk or not according to preset values. Since the detector can test not only the alcohol concentration of drivers, but also the alcohol in the air, and has the function of LCD display and sound light alarm, it is promising to be popularized in daily alcohol test due to its easy-use and reasonable-price.

Design on Alcohol Concentration Detector Based on STC89C52