Hi

I want to design a simple circuit to detect when a push button is pressed but this push button is pulled up to 5v or 12v and the circuit can work with both voltages. Also a debouncing circuit is a need.

Thanks

 

Do you have a specific question? Try and work out the design for yourself & if you are unsure, post back here. You can find reference design on google if you need it. Search for debouncing circuits for a start.

 

Look for a debounce ckt. with an open collector output to facilitate the 5 or 12V you mentioned.

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"Everything that is done in the world is done by hope." -Martin Luther
"There are two ways to live your life. One is as though nothing is a miracle. The other is as though everything is a miracle."-Albert Einstein

 

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read this http://www.ganssle.com/debouncing.pdf
about the best treatment of this seemingly simple process.