Tachomter PIC18F2550 Help !

Discussion in 'The Projects Forum' started by splendid-electron, Jan 26, 2014.

  1. splendid-electron

    Thread Starter New Member

    Jan 26, 2014
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    I need your help to understand more how does this circuit work theory !
    [​IMG]
     
  2. ericgibbs

    Senior Member

    Jan 29, 2010
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    It could be either 'reflective' or 'interrupted' ,, Emitter to Detector.

    Do you have a link or other information on where it is used.?
    E
     
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  3. splendid-electron

    Thread Starter New Member

    Jan 26, 2014
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  4. ericgibbs

    Senior Member

    Jan 29, 2010
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    hi,
    Its as the link states, the Emitter IR LED is ON for 1second and the IR Detector receives an increase in reflected IR every time the White piece of paper passes under the faces if the Emitter and Detector.
    The transistor at the detector is used to amplify the weak reflected IR pulse voltage to level suitable for the MCU to 'see' as a pulse.

    Is this what you are asking.?
    E
     
    Last edited: Jan 26, 2014
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  5. splendid-electron

    Thread Starter New Member

    Jan 26, 2014
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    yes.. but i didn't how can i find the value of the resistors ??
     
  6. ericgibbs

    Senior Member

    Jan 29, 2010
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    hi,
    The values of the resistors are already shown on the circuit you posted.
    example:
    4.7K ohms and 68 Ohms

    1.8K, 1K and 10K Ohms

    The unmarked Diode 'D' is a general purpose signal diode.
     
  7. splendid-electron

    Thread Starter New Member

    Jan 26, 2014
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    hi eric please can u give a tutoriel how to programm with mikroc whats is the instructions i should follow

    im beginner
     
  8. ericgibbs

    Senior Member

    Jan 29, 2010
    2,499
    380
    splendid-electron likes this.
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