ultrasonic distance project

Discussion in 'Embedded Systems and Microcontrollers' started by Sundhir52, Oct 7, 2009.

  1. Sundhir52

    Thread Starter New Member

    Oct 7, 2009
    1
    0
    hey guys,

    i'm new to the forum, and new to pic. i have a design project due soon and i am having a few problems.
    basically it as an ultrasonic distance measure, using 40 Khz transducers. display is 4 seven-segs, pic16f913, and measurement is done on the press of a push button switch

    I am using PWM to generate my pulses, timer0 to multiplex my displays, and i want to use timer1 to time the wave.

    Firstly how do i send a limited number of pulses?
    How do i stop the timer when the return wave occurs?
    and how do i read the return wave, as when i check on a scope it returns at 0.8 V, what do i do?

    any help and feedback you guys could provide my will be greatly appreciated.

    many thanks
    Sun
     
  2. BMorse

    Senior Member

    Sep 26, 2009
    2,675
    234
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