I have seen some tutorials on ultrasonic range detector sensor.
In that, what is the meaning of the word pulseIn?
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The timing of this function has been determined empirically and will probably show errors in shorter pulses. Works on pulses from 10 microseconds to 3 minutes in length. Please also note that if the pin is already high when the function is called, it will wait for the pin to go LOW and then HIGH before it starts counting. This routine can be used only if interrupts are activated. Furthermore the highest resolution is obtained with short intervals. Syntax Parameters pin: the number of the pin on which you want to read the pulse. (int) value: type of pulse to read: either HIGH or LOW. (int) timeout (optional): the number of microseconds to wait for the pulse to be completed: the function returns 0 if no complete pulse was received within the timeout. Default is one second (unsigned long). Returns The length of the pulse (in microseconds) or 0 if no pulse is completed before the timeout (unsigned long). For additional information and example code, visit: https://www.arduino.cc/en/Reference/PulseIn, hope this help you to understand the meaning of |
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