1.MCU:AT89S52 chip or AT89C52 2: 12MHz crystal This procedure with temperature compensation, temperature measurement using DS18B20 1.LCD1602 LCD display, ultrasonic module to access. 2 note the polarity ultrasonic module power supply. Not clear please reference the good Taobao circuit diagram 3 does not use frequency of 12MHz crystal, with other frequency oscillator, timer value and measurement The frequency of 40KHz pulses emitted by the wrong. 4 user often mistakenly sent 20KHZ pulse when the 40KHZ pulse. (40KHz pulse frequency, cycle 25us, The duty cycle is 50 = 12.5us) 5 if it is adjustable ultrasonic module development board, please check whether the circuit development board and the ultrasonic module Control pin multiplexing, if reuse, please by jumper circuit development board. 6 if you are using a universal board, please make sure to reset circuit and oscillator circuit of MCU is normal, and at the same time MCU 31 feet (EA) remember with the high level.

超声波测距配备资料
..................\MSP430超声波测距.pdf
..................\电路和使用说明.pdf
..................\超声波测距仪.doc
..................\超声波测距论文.doc
..................\配套程序
..................\........\LCD1602显示不带温度补偿的测距程序
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..................\........\.................................\chengxu.c
..................\........\.................................\chengxu.LST
..................\........\.................................\chengxu.OBJ
..................\........\.................................\csb1.hex
..................\........\.................................\csb1.M51
..................\........\.................................\csb1.opt.bak
..................\........\.................................\csb1.plg
..................\........\.................................\csb1.Uv2.bak
..................\........\.................................\csb1.uvopt
..................\........\.................................\csb1.uvproj
..................\........\.................................\csb1_Opt.Bak
..................\........\.................................\csb1_Uv2.Bak
..................\........\.................................\csb1_uvopt.bak
..................\........\.................................\STARTUP.A51
..................\........\.................................\STARTUP.lst
..................\........\LCD1602显示带温度补偿
..................\........\.....................\chengxu2.bak
..................\........\.....................\chengxu2.c
..................\........\.....................\chengxu2.LST
..................\........\.....................\chengxu2.OBJ
..................\........\.....................\chengxu2.__i
..................\........\.....................\csb_temp
..................\........\.....................\csb_temp.hex
..................\........\.....................\csb_temp.M51
..................\........\.....................\csb_temp.Opt
..................\........\.....................\csb_temp.plg
..................\........\.....................\csb_temp.Uv2
..................\........\.....................\csb_temp_Opt.Bak
..................\........\.....................\csb_temp_Uv2.Bak
..................\........\.....................\STARTUP.A51
..................\........\.....................\STARTUP.lst
..................\........\.....................\STARTUP.obj

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