文档介绍：便携式超声波测距仪
摘要
本设计以 Philips 的低功耗单片机 LPC922 为核心控制器件,使用 LM567 和
低功耗集成运放 LM358 制作了放大鉴频电路,并以 CD4051 实现放大倍数的切换;
采用 CD4069 反相器提高信号发射功率;结合 ISD4002 语音芯片所具有的语音处
理功能实现语音播报距离;使用温度传感器 DS18B20,设计的一种带有温度补偿
的便携式超声波测距仪,设计中充分使用单片机的数学运算和控制功能,使系统
实现了下限报警,并具有较高的测量精度和较短的反应时间。实现了最大测距
6m、测量盲区、测量误差± 、系统平均工作电流成功的控制在
以内、数据更新速度小于 1s 。成功完成了题目的全部基本要求和发挥部分,并
有自己的特色发挥,整体上保证了设计任务的超额完成。
关键词:超声波测距低功耗 P89LPC922 单片机语音播报低压差稳压器

Abstract
The design of low-power Philips LPC9222 microcontroller as the core
control devices, the use of LM567 and low power consumption integrated
operational amplifier LM358 produced Larger frequency circuits, and to
achieve gain CD4051 switch used to improve the signal-RP-CD4069
Transmitting power in conjunction with the ISD4002 voice chip with the
voice processing voice broadcast from the use of temperature sensors
DS18B20, designed with a pensation portable ultrasonic
range finder, the design of the full use of SCM math and control Function,
allowing the system to achieve a minimum level alarm, and have a high
accuracy and a shorter reaction time. To achieve the greatest range 6 m,
blind spot measuring m, measurement error m, an average of system
control in the current ess of less than mA, data update rate of
less than 1 s. The pletion of the topics of all basic
requirements and play a part and have their own ch