Opposite Relay

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AtomSoft

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Hey guys, this may sounds like a dumb question but i have a button when the button is pressed it sends out 12v ... what would be the best way to drop that 12v to 3.3v for usage on a uC?

Should i use a few diodes or some type of resistor divider?

Basically whats the best way to take a HIGH voltage in and spit out a smaller one? Its just a signal, not for powering any devices.
 
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Resistor divider or a zener diode would give fast turn on times. I've used regulator cheap 32 cents and one piece.
 
I hacked a old laptop that couldn't be fixed do to cost. It had one of them crystal eye web cam's there 3.3 volt. I figured it would be 5 volt glad i did some reading up on them.
They can't take 5 volts from a pc USB. Used some 3.3 regulators on the PC side of things and she works like a dream.
 

Just a single resistor will do, the PIC's protection diodes will clip the signal to 3.3V for you, that's why they are there.

However, using two resistors as a potential divider will happily do it as well, there's certainly nothing more complicated needed.
 
Awesome! I wanted to make sure i didnt do too little to drop it. I guess my thoughts were spot on

Thanks everyone.
 
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