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A "pull-up" resistor is a resistor used to to perform a specific electronic function - it is not a different type of resistor. A very small current flows through a pull-up resistor so it does not need to be high wattage (1/8 watt is generally fine). The value of a pull-up resistor depends on the resistance of the sensor. If it is simply on or off (no resistance) then a typical pull-up resistor might be 10k ohms.

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Q: What is different between the resistor and pullup resistor?
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Diff between weak and strong pull up resistor?

A weak pull-up resistor has a higher resistance value, typically in the range of 10kΩ to 100kΩ, and is used to ensure a default logic level when the circuit is open. A strong pull-up resistor has a lower resistance value, typically in the range of 1kΩ to 5kΩ, and is used to assert a logic level more forcefully, overcoming stronger pull-downs or noise.


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A pullup can be considered a kind of diaper The main difference between a pullup and a normal diaper is that a pullup can be easily pulled on and off in the manner of normal underwear. Additionally, many pullups don't hold as much urine as a normal diaper.


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There are many reasons that one might prefer to use negative logic in some or all of a design, a few of these are:discrete switch closure inputs - closing the switch grounds the line (true), opening a pullup resistor pulls the line high (false)multisource signals can be "wire ored" using open collector/drain outputs and a single pullup resistor, instead of needing many actual or gate devicesetc.


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There is no relation between the resistor's ohms value and its size. The power of the resistor can be seen by its size. If the power is too small, the resistor can be destroyed.


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