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Pull up resistor

mik3

mik3

Joined Feb 4, 2008
4,843
Some PIC microcontrollers have internal pull up resistors which can be activated by the software. Just for information. ;)
 
K

kuttihan

Joined Mar 1, 2009
1
Alberto said:
Pullup or pulldown resitor is needed all the time you make a pin an input, since leaving the input floating will generate unpredictable results, you pull it up so that the value is 1 when switch or sensor connected to that pin is open, will become zero when sensor or switch will ground the pin. Normally a pullup resistor is any value from 10K to 20K.

Alberto
Click to expand...
Hi,
You said pull-up resistors are required while using a pin as an input. Are they required while connecting an LCD with microcontroller? (i.e. when we connect output device to the mcu) If yes, why would we require that??
 
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