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LED seven segment counter

Discussion in 'Electronic Basics' started by Darlapphood, Oct 27, 2005.

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  1. Darlapphood

    Darlapphood Guest

    I have a counter i want to increment with a normally open output wire fro
    a pnp sensor. When i activate the sensor the counter counts at a
    incredible rate. Could anyone help me with this?
  2. Chris

    Chris Guest

    A "PNP sensor" traditionally means a three wire sensor (V+, OUT, and
    GND) whose output is the collector of a PNP transistor whose emitter is
    tied to V+. This means you need a load (typically a resistor) to GND
    in order for the circuit to complete, like this (View in fixed font or
    M$ Notepad):

    | | |
    | '----. |
    | | |
    | |< |
    | -| |
    | |\ |
    | | |
    | | |
    | | | Out Vr
    | '-------o-----o
    | | |
    | PNP Sensor| .-.
    | | | | 1K
    '----o------' | |
    | '-'
    | GND |
    created by Andy´s ASCII-Circuit v1.24.140803 Beta

    A couple of questions, if you would:

    * What's your power supply voltage? Is it regulated?

    * Is your counter a mechanical counter, an electronic counter, a CMOS
    or TTL counter IC, or what?

    * Is this an electrically noisy environment?

    * Specifically what is your PNP sensor (as in make and model), and what
    load is it driving? A resistor or what?

    This would give you a start on a discussion about your problem, instead
    of just waiting for us to guess what you mean. You'd be amazed at how
    many people on s.e.b. will be willing to help, if you provide a good
    problem description.

  3. Impmon

    Impmon Guest

    Sounds like you need a debouncing circuit. Can be as simple as a
    couple NAND gates in series. Also if the sensor doesn't offer both
    high and low (ie low and open) then you will need a pullup resistor
    either to VCC or ground to compenstate for open connection.
  4. Darlapphood

    Darlapphood Guest

    the output directly into the input of the 4029 is this wrong? I'm a supe
    beginner =(
  5. Please learn how to write replies. Don't write within other people's
    quotes, it's almost impossible to find the text you write.
  6. Darlapphood

    Darlapphood Guest

    Inductive proximity switch DC 10-30v model AE1-AP-1A

    I just put the output directly into the input of the 4029 (CLK)is thi
    wrong? I'm a super
    Do i need to setup some sort of relay or i've heard people talk about
    pull up. I want to understand but I dont.I need specific part numbers an
    names of components because im wicked new at this.

    Could i trigger some sort of event with the sensor that increments th
    counter once?

    Please any help is very much appreciated. Thanks.
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