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基于酒精浓度测仪 关键词：酒精浓度测仪Alcohol Concentration Monitor Based on STC89C52 ABSTRACT Drinking driving is becoming a serious social problem with more social concerns, alcohol concentration is also important in industrial production, so an alcohol detector is designed to detect the alcohol concentration in the air. STC89C52 is a programmable control microprocessor, with small volume, low price, stable performance characteristics, and widely applied to industrial automation, intelligent instrument, etc. Alcohol sensor MQ3 is widely used for its high sensitivity, stability, price cheap, small volume. Alcohol detectors hardware consists of STC89C52, alcohol sensor MQ3, A/D converter TLC549, LED, keyboard and buzzer. C language is used to realize the software. Alcohol concentration signal is changed into voltage signal by MQ3, then the voltage signal is changed into digital signal through A/D converter. Digital signal is analyzed and processed by STC 89C52 and sent to display. Because different environments require different alcohol concentration, here you can set different values by the keyboard, then displayed on LED , comparing with the detecting value. When detecting value is more than setting value, STC89C52 will control buzzer alarms. The device realizes the monitor, display and alarm. Simulation results in the Proteus7.5 show that alcohol detector can monitor the range 10～1000ppm alcohol, precision to ± 4ppm and realizes real-time display ,sound-light alarm function. In addition, the alcohol detector has stable performance and promising market prospect . Key words: alcohol concentration monitor, STC89C52, TLC549, alcohol sensor MQ3, LED display 目　录 前　言 1 第1章 酒精浓度监测仪的整体结构 2 §1.1 酒精浓度监测仪的特点 2 §1.2 硬件设计及功能方案框图 2 第2章 酒精监测仪的硬件结构设计及原理 5 §2.1 硬件原理 5 §2.1.1 硬件原理说明 5 §2.1.2 实践方法步骤 7 §2.2 各元器件的选取与介绍 7 §2.2.1 酒精传感器MQ3的选择 7 §2.2.2 串行模数转换器TLC549 10 §2.2.3 关于AT89C52的选取 10 §2.3 各模块电路工作原理 12 §2.3.1 按键电路工作原理及按键作用 12 §2.3.2 检测电路及A/D转换电路 13 §2.3.3 显示电路和报警电路 14 §2.3.4 时钟电路和复位电路 15 第3章 酒精测