摘要
系统以单片机AT89S52为控制核心,采用语音芯片ISD2590构成语音电路,实现了测量结果语音化。超声波传播的速度随温度的变化而变化。为了准确计算出超声波的实时传播速度,系统采用DS18B20温度传感器测量环境温度。为了提高远距离测量的精度,系统设计了AGC电路。为了减小偶然因素对测量结果的影响,系统每次测距都连续测量10次,取平均值作为测量的结果。实践证明:该测距仪具有较高的测量精度和很高的推广价值。
Single chip microcomputer AT89S52 is control core in the system,and the voice circuit of the system is composed of voice chip ISD2590,which realizes that the measuring results are calculated in real-time.There is the propagation velocity of the ultrasonic varying with the environmental temperature.In order to accurately calculate the real-time propagation velocity of the ultrasonic,the system measures the environmental temperature by the DS18B20 temperature sensor.To increase the accuracy in measuring farther distance,automatic gain control circuits have been designed.To reduce the accidental factors influencing the measuring results,the average value of every ten measurements is taken as the accurate result.The practice result shows that the range finder has high measuring precision and very high generalizing value.
出处
《现代电子技术》
2008年第11期127-129,132,共4页
Modern Electronics Technique
