--超声波测距模块--测距--最简单的c代码（- Ultrasonic Ranging Module - ranging - the simplest c code）.docVIP

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--超声波测距模块--测距--最简单的c代码（- Ultrasonic Ranging Module - ranging - the simplest c code）.doc

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--超声波测距模块--测距--最简单的c代码（- Ultrasonic Ranging Module - ranging - the simplest c code）

--超声波测距模块--测距--最简单的c代码（- Ultrasonic Ranging Module - ranging - the simplest c code） I am * freshman electronic professional, because the school this semester is not the creation of relevant professional courses, all is now self SCM Technology Co.,, without temperature compensation, digital tube display with no latch chip, with a C language master write the most easy to read and can run effectively the microcontroller program is written to their most simple code, please dont laugh at me. O (a _ U) O*/ * because always want to try a few days ago to buy ultrasonic ranging, so the ultrasonic module HC-R4, the Internet to find a principle (the principle is very simple), then try to write their own code, the following code basically is to come out of their own, have no reference to others, not to say that I dont want to refer to someone else, but because a lot of online master but they write the code I basically have a lot cannot read ah, so the following program should have a lot of room for improvement. * / The basic working principle of ultrasonic module / * (data from online to share): (1) IO TRIG is used to trigger ranging, and at least 10us high level signal is given; (2) the module automatically sends 8 40KHz Fang Bo, automatically detects whether there is a signal to return; (3) there is a signal to return, through the IO port ECHO output a high level, the duration of the ultrasonic wave from the launch to the return time. Test distance = (high level time * speed of sound (340M/S)) /2; It is very simple to use, a control port with a 10us above high level, you can wait for the high level output on the receiving port. An output can open the timer, when this port is low we can read the timer value, then the ranging time, can calculate the distance this constant cycle. That is, can achieve the measurement of the value of mobile. * / /****************************************************************************************************************************************