Re: [avr-gcc-list] measuring uC supply voltage

[Andy Warner]

JAMIE MORKEN wrote:
> [...]
> I have some potentiometer joysticks that are run by the 5V supply, so I may 
> have to correct these if the supply droops below 5V, but under normal 
> operating conditions the supply should be 5V and if it is not there will be 
> more problems than just innacurate sensor readings.  Thanks,

I'd second the recommendation make by someone else, you can feed the
joysticks from Vref, then V+ variations won't matter.

Alternatively, if these are the only things you are
reading with the ADC, and they are fed from the same
V+, the readings should stay the same, regardless of V+
variations. Since the potentometer's output is a
proportion of V+, and when V+ is used as a reference
for the ADC, the ADC will also simply measure the input as
a proportion of V+ - it should all just work out.
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Andy Warner             Voice: (612) 801-8549   Fax: (208) 575-5634