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You are here: Home / Replies / Hi,A pull-up or pull-down

Hi,A pull-up or pull-down

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Projects › Projects › Distance measurement using InfraRed sensor › Hi,A pull-up or pull-down

October 23, 2012 at 6:45 am #8683
AJISH ALFRED
Participant

Hi,

A pull-up or pull-down resistor is basically used to preset a value (logic high or logic low) at any pin.

Find the discussion about pull-up and pull-down concept in this forum itself.

 

A pull-up is done by connecting a pin to VCC through a resistor (normally 1K) and a pull down is done by connnecting a pin to ground through a resistor (normally 1K). Pull-up make the preset voltage at the pin as logic high and pull-down make the preset voltage at the pin as logic low. We can change those voltages by writing a low or high respectievely.

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