基于STM32单片机的车载酒精检测系统设计

Design of Vehicle Alcohol Detection System Based on STM32

摘要: 本系统设计一种实时检测与上传酒驾信息的车载酒精检测系统。传感器采集车内的酒精浓度、车内温湿度，并通过数字滤波得到检测的数据。采用超声波测距模块测量驾驶员与测试系统的距离，然后根据数学模型换算出驾驶员口腔附近的酒精浓度。采用MATLAB将血液中的酒精浓度与车内温湿度、空气中的酒精浓度进行拟合，将处理后的数据与设置的阈值比较。在与阈值比较前，汽车启动系统处于锁死状态，汽车无法启动。如若此时没有超过上限阈值，继电器常闭触点不动作，正常指示灯亮起，允许驾驶员启动汽车，如若超过上限阈值，则断开点火电路，同时LCD显示屏提醒驾驶员处于酒驾状态，请勿驾驶，此时可以通过按下按键跳转至通信界面，此界面可以选择发送短信或者拨打电话。该系统可以实现实时检测和上传车内酒精浓度，可以很好的减少酒驾引起的交通事故，具有很好的实际应用价值。

Abstract: The system designs a vehicle-based alcohol detection system that detects and uploads drunk driving information in real time. The sensor collects the alcohol concentration in the vehicle, the temperature and humidity in the vehicle, and obtains the detected data through digital filtering. An ultrasonic distance measuring module is used to measure the distance between the driver and the test system, and then the alcohol concentration near the mouth of the driver is converted according to a mathematical model. MATLAB was used to fit the blood alcohol concentration with the temperature and humidity in the car and the alcohol concentration in the air, and the processed data was compared with the set threshold. Before comparing with the threshold, the car startup system is locked and the car cannot start. If the upper limit threshold is not exceeded at this time, the normally closed contact of the relay does not actuate, and the normal indicator lights, allowing the driver to start the car. If the upper limit threshold is exceeded, the ignition circuit is discon-nected and the LCD screen reminds the driver that he is in a drunken driving state, do not drive. At this time, you can press the button to jump to the communication interface. This interface can choose to send an SMS or make a call. The system can realize real-time detection and uploading of alcohol concentration in the vehicle, which can well reduce traffic accidents caused by drinking driving, and has good practical application value.