How to control Raspberry Pi to measure distance using SRF05 ultrasonic sensor on MATLAB?

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Thanh Long Tran 2018-5-3

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/398894-how-to-control-raspberry-pi-to-measure-distance-using-srf05-ultrasonic-sensor-on-matlab

评论： Sinan Çolak 2020-5-6

I am trying to control my Raspberry Pi 3 Model B to use SRF05 ultrasonic sensor on MATLAB. This is my hardware connection as shown in the image - Vcc to 5V - Trig to GPIO 21 - Echo is connected to a voltage divider circuit to ensure the input is around 3.3V, the input is connected to GPIO 20 - GND to GND

Here is my code:

clear all
mypi=raspi;
pin=mypi.AvailableDigitalPins;
trig=pin(18);
echo=pin(17);
configureDigitalPin(mypi,trig,'output');
configureDigitalPin(mypi,echo,'input');
writeDigitalPin(mypi,trig,0);
while 1
    writeDigitalPin(mypi,trig,0);
    pause(2)
    writeDigitalPin(mypi,trig,1);
    pause(0.00001)
    writeDigitalPin(mypi,trig,0);
      while readDigitalPin(mypi,echo)==0
          continue
      end
      tic
      while readDigitalPin(mypi,echo)==1
          continue
      end
          duration= toc
      distance=duration*17150
  end