ATmega16的语音型超声波测距仪的设计

Voice Type Ultrasonic Range Finder Based on ATmega16

介绍一种以单片机ATmega16为核心的超声波测距仪。该测距仪利用单片机ATmega16的输入捕获功能,测量超声波从发射探头发射至接收探头接收所经过的时间;采用DS18B20测量环境温度,补偿温度的变化对超声波传播速度的影响,提高测量精度;利用语音芯片ISD4004播报测量结果等语音信息。给出了测距仪的关键硬件电路、测量时间的输入捕获中断子程序和录音/放音子程序。测试结果表明,该测距仪测量精度高,语音播报清晰、流畅。

An ultrasonic range finder using MCU ATmega16 as the core is introduced. The system uses the input capture function of MCU ATmega16 to measure the time which ultrasound travels from sending probe to receiving probe, utilizes DS18B20 to measure am blent temperature so as to compensate for the temperature influence of ultrasound velocity and improve the range measurement accuracy, and voice chip ISD4004 is used to broadcast voice information such as measurement results. Key hardware circuits, the input capture in- terrupt subroutine for time measurement and subroutine for voice playing/recording are given. Test results show that the range finder has high accuracy and the voice broadcast is clear and smooth.