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Dependencies:   mbed

include/SR04.h

Committer:
overkiller
Date:
2015-08-15
Revision:
6:9eb153e1d472
Parent:
5:1afe17a20a5b

File content as of revision 6:9eb153e1d472:

#ifndef SR04_H
#define SR04_H
DigitalOut pinTrigg(PC_10);
DigitalIn pinEcho(PC_12);
const char* distMsg = "Actual distance: %g \n\r";
float actualDistance = 0;
float pulseIn(DigitalIn pin)
{
  Timer durationTimer;
  float tempDuration = 0;
  while(!pin); //wait for high
  durationTimer.start();
  while(pin); //wait for low 
  tempDuration = durationTimer.read_us();
  return tempDuration;
}
float getDistance(int sensorID)
{
    if(sensorID == 0)
    {
        float duration = 0;
        pinTrigg = 0;
        wait_us(2);
        pinTrigg = 1;
        wait_us(10);
        pinTrigg = 0;
        duration = pulseIn(pinEcho);
        duration /= 58; //datasheet!
        return duration;
    }
    return 0;
}
#endif //SR04_H