74192 Help

Discussion in 'The Projects Forum' started by noramczyk, Oct 11, 2011.

  1. noramczyk

    Thread Starter New Member

    Aug 22, 2011
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    I was having trouble with the inputs of the up/down pins of the 74192 I am either trying to use a switch to toggle between the up and down. Or I am trying to use two hall effect magnetic sensors that are being inverted with a 7404 to increment or decrement the count on a 7 segment display. If any knows a solution I would appreciate it.
     
  2. KJ6EAD

    Senior Member

    Apr 30, 2011
    1,425
    363
    You need a pull up or pull down resistor on the input.
     
  3. noramczyk

    Thread Starter New Member

    Aug 22, 2011
    4
    0
    I am using 1k resistors as a pull ups and the count works fine for the down count but the up count is incrementing by two each time the sensor is triggered. Thanks for the response.
     
  4. elec_mech

    Senior Member

    Nov 12, 2008
    1,513
    193
    Does the down count work properly when you use a switch instead of a sensor?

    Could you post a schematic? You may have noise coming in somewhere or something else going on.
     
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