The power comes from the trickle charge to a 12 v alarm battery. I have a pretty well filtered supply because of the supply wires running parallel to 120v AC wires.
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Re: Chip Selection
The power comes from the trickle charge to a 12 v alarm battery. I have a pretty well filtered supply because of the supply wires running parallel to 120v AC wires.
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Re: Chip Selection
I've never, and will never trust any Pull-up thing. As per their definition they are weak. nuff said. In a shielded enclosure with no external inputs, running off battery maybe they're fine... but not something I would use again on a final product since I already got issue with some handheld car instruments I've made years ago. Ununsed i/o are set to input and tied to GND directly, or with low value pull-down.
Some will say set them as output and left them floating... ok .. could be fine as long as you always have supply on your board.
GOOD ground plane will also help.
Steve
It's not a bug, it's a random feature.
There's no problem, only learning opportunities.
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Re: Chip Selection
The input pins will not handle 12 volts. It is a wonder it works at all.Originally Posted by AMay
Or.
You misunderstood the question....
Dave
Always wear safety glasses while programming.
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Re: Chip Selection
Or maybe you missed the original post where he states:
"I have a 100uf cap at the input, and a 78L05 regulator, a .1 cap on the 5v side."
Last edited by Charlie; - 26th August 2011 at 12:31.
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Re: Chip Selection
Moved from FAQ.
PIC selection guide:
http://www.microchip.com/stellent/id...GE&nodeId=2551
How robust is a PIC?
http://www.picbasic.co.uk/forum/showthread.php?t=15993
Robert
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