"基于单片机的酒精浓度测试仪设计及应用研究"

The summary of the given content is as follows: The increasing number of private cars due to the rapid development of the Chinese economy has led to a growing concern for road safety. Drunk driving is a severe problem that can be avoided. To curb this behavior, alcohol concentration testing for drivers is an effective method. The alcohol tester should be able to accurately measure alcohol concentration and display the readings for the user. Additionally, it should have an alarm system to alert individuals when the concentration exceeds the permissible limit. This study aims to design an alcohol concentration tester that can detect and display different levels of alcohol concentration. The design utilizes the STC89C52 microcontroller and the MQ-3 gas sensor. The measured data can be easily displayed using diodes. When the concentration exceeds the allowable value, the tester emits a beep alarm. Keywords: alcohol concentration testing, STC89C52 microcontroller, MQ-3 gas sensor, A/D conversion.