"酒精心率检测系统：交通事故防范的重要利器"

In the era of rapid economic development, the increasing number of vehicles has led to a rise in traffic accidents. Therefore, the design of a device that can detect both alcohol levels and heart rates has become crucial. This design consists of an STC89C52 microcontroller circuit, MQ-3 alcohol sensor, independent keypad circuit, liquid crystal circuit, ADC0832 analog-to-digital converter, infrared reflection sensor ST188, buzzer alarm circuit, amplification circuit, and power supply. The device detects the driver's alcohol concentration and heart rate through sensors, with the independent keypad setting predetermined values that are then transmitted to the microcontroller for data processing. If the detection value exceeds the predetermined value, the alarm circuit will sound an alert. When the buzzer goes off, it indicates that the driver is driving under the influence of alcohol. This system increases the efficiency of traffic police in detecting drunk driving, thereby reducing the number of traffic accidents and ensuring the safety of people's lives and property. Keywords: STC89C52 microcontroller, MQ-3 alcohol sensor, infrared reflection sensor, traffic accidents.