基于STC15W402AS单片机的汽车电笛设计

Design of Car Flute System Based on STC15W402AS Single Chip Microcomputer

采用性价比很高的STC15W402AS单片机设计汽车电子电笛系统,其音量和音调能够根据车辆的行驶速度和路况自动调节。该系统由热释电红外传感器检测车辆附近行人情况;由车速传感器检测车辆行驶速度;由STC15W402AS单片机根据上述情况自动调节PWM的占空比;由开关功率放大器放大单片机输出PWM脉冲,推动高音扬声器发出适合的电笛信号。结果表明,该系统降低了噪声污染,节省了电能。

The high cost of STC15W402AS microcontroller design car electronic electric flute system, the volume and pitch can be based on the vehicle＇s speed and road conditions automatically adjust. The system by pyroelectric infrared sensor detects the vehicle near the pedestrian situation; by the vehicle speed sensor detects the vehicle speed; by the STC15W402AS microcontroller automatically adjust the duty cycle of PWM according to the above; by the switching power amplifier microcontroller output PWM pulse, push the tweeter issue Suitable siren sound signal. The results show that the system reduces noise pollution and saves energy.