超声波模块使用说明书

超声波模块使用说明书尊敬的客户：您好！感谢您选用本店的超声波测距模块，为了更快更好的使用本产品，请您仔细的阅读本使用说明书。

一、超声波测距模块简介检测距离：5CM-5M分辨率：5MM数字电平信号，可直接接单片机，无需任何辅助电路，也无需单片机产生任何信号辅助，距离和模块输出信号脉冲长度成正比。

尺寸：43.5*20.5毫米高度：13.8毫米二、超声波测距模块的引脚功能如上图所示：从左到右依次为VCC、控制发射、接收信号（距离信号由此输出）、空脚、GND。

（以上是正确顺序,模块上所标的不对,特此更正）三、测距方式:通过单片机i/o口向模块控制信号接口发送一个>=10US的高电平信号（启动测距功能），等待然后是检测输出信号，输出信号的高电平时间与距离成正比。

然后根据高电平的时间便可计算出距离。

示例程序：///////////////////////////////////////////////////////////////////// ///////////////PIC16F877+DYP-ME007+LCD03example//Written October2005by Gerald Coe,using HITECH PIC16compiler////Note-assumes a20MHz crystal,which is5MHz timer clock//A1:4prescaler is used to give a 1.25MHz timer count(0.8uS per tick)////This code is Freeware-Use it for any purpose you like./////////////////////////////////////////////////////////////////////// //////////#include<pic.h>#include<stdio.h>__CONFIG(0x3b32);#define trig RB0#define echo RB1void clrscn(void);//prototypesvoid cursor(char pos);void print(char*p);void setup(void);unsigned int get_srf04(void);char s[21];//buffer used to hold text to printvoid main(void){unsigned int range;setup();//sets up thePIC16F877I2C portclrscn();//clears the LCD03disply cursor(2);//sets cursor to1st row of LCD03sprintf(s,"SRF04Ranger Test");//text,printed into our bufferprint(s);//send it to the LCD03while(1){//loop foreverrange=get_srf04();//get range from srf04 (round trip flight time in0.8uS units)cursor(24);//sets cursor to2nd row of LCD03sprintf(s,"Range=%dcm",range/72);//convert to cmprint(s);//send it to the LCD03cursor(44);//sets cursor to3rd row of LCD03sprintf(s,"Range=%dinch",range/185);//convert to inchesprint(s);//send it to the LCD03TMR1H=0;//52mS delay-this is so that the SRF04ranging is not too rapidTMR1L=0;//and the previous pulse has faded away before we start the next oneT1CON=0x21;//1:4prescale and runningTMR1IF=0;while(!TMR1IF);//wait for delay timeTMR1ON=0;//stop timer }}unsigned int get_srf04(void){TMR1H=0xff;//prepare timer for10uS pulse TMR1L=-14;T1CON=0x21;//1:4prescale and runningTMR1IF=0;trig=1;//start trigger pulsewhile(!TMR1IF);//wait10uStrig=0;//end trigger pulseTMR1ON=0;//stop timerTMR1H=0;//prepare timer to measure echo pulseTMR1L=0;T1CON=0x20;//1:4prescale but not running yetTMR1IF=0;while(!echo&&!TMR1IF);//wait for echo pulse to start(go high)TMR1ON=1;//start timer to measure pulsewhile(echo&&!TMR1IF);//wait for echo pulse to stop(go low)TMR1ON=0;//stop timerreturn(TMR1H<<8)+TMR1L;//TMR1H:TMR1L contains flight timeof the pulse in0.8uS units}void clrscn(void){SEN=1;//send start bitwhile(SEN);//and wait for it to clearSSPIF=0;SSPBUF=0xc6;//LCD02I2C addresswhile(!SSPIF);//wait for interruptSSPIF=0;//then clear it.SSPBUF=0;//address of register towrite towhile(!SSPIF);//SSPIF=0;//SSPBUF=12;//clear screenwhile(!SSPIF);//SSPIF=0;//SSPBUF=4;//cursor offwhile(!SSPIF);//SSPIF=0;//PEN=1;//send stop bitwhile(PEN);//}void cursor(char pos){SEN=1;//send start bitwhile(SEN);//and wait for it to clearSSPIF=0;SSPBUF=0xc6;//LCD02I2C addresswhile(!SSPIF);//wait for interruptSSPIF=0;//then clear it.SSPBUF=0;//address of register to write towhile(!SSPIF);//SSPIF=0;//SSPBUF=2;//set cursorwhile(!SSPIF);//SSPIF=0;//SSPBUF=pos;//while(!SSPIF);//SSPIF=0;//PEN=1;//send stop bitwhile(PEN);//}void print(char*p){SEN=1;//send start bitwhile(SEN);//and wait for it to clearSSPIF=0;SSPBUF=0xc6;//LCD02I2C addresswhile(!SSPIF);//wait for interruptSSPIF=0;//then clear it.SSPBUF=0;//address of register to write to while(!SSPIF);//SSPIF=0;//while(*p){SSPBUF=*p++;//write the datawhile(!SSPIF);//SSPIF=0;//}PEN=1;//send stop bitwhile(PEN);//}void setup(void){unsigned long x;TRISB=0xfe;//RB0(trig)is outputPORTB=0xfe;//and starts lowTRISC=0xff;PORTC=0xff;SSPSTAT=0x80;SSPCON=0x38;SSPCON2=0x00;SSPADD=50;//SCL=91khz with20Mhz Oscfor(x=0;x<300000L;x++);//wait for LCD03to initialise}注：只是提供一个编程思路，可能还需要自己动手编程，没有其他程序了。

C语言是通用语言，相信大家都是精鹰，看这点程序肯定没问题。

再次感谢使用本店的模块。