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Re: [avr-gcc-list] measuring uC supply voltage
From: |
Christian Vogel |
Subject: |
Re: [avr-gcc-list] measuring uC supply voltage |
Date: |
Sun, 24 Oct 2004 09:24:51 +0200 |
User-agent: |
Mutt/1.2.5.1i |
Hi,
depending on the precision requirements you have, you could
also just measure some external refecence Vext < Vcc while
using Vcc as the ADC reference voltage. That external reference
might be as simple as the voltage drop over (say) a power LED +
resistor. (have I mentioned that it is depending on your
precision requirements? :-) )
Then you just calculate Vcc = (Vext * 1024 / ADC)
Chris
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