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Discussion in 'General Electronics Discussion' started by garlitos, Jun 7, 2013.

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  1. garlitos


    Jun 7, 2013
    i have this keypad design and it works fine. i need to know why there is the 1K resistors. any help?

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  2. davenn

    davenn Moderator

    Sep 5, 2009
    they are either pull up or pull down resistors ( depending on if they are going to the +V rail or the 0V rail)
    The chip that scans the keyboard keys will see wither +V or 0V till the key is press when the opposite polarity is read

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