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[DPRG] Processor Communication via ADC
Subject: [DPRG] Processor Communication via ADC
From: Eric Sumner
kd5bjo at gmail.com
Date: Thu Feb 14 13:31:26 CST 2008
> Well you have to make sure the grounds stay the same.
> And how accurate are you shooting for? If you say 8 bits and use a 10
> bit ADC and DAC then you have a chance.
Yes. 8/10 is exactly the situation that I'm looking at.
> Why not use PWM? A lot of processors have built in PWM generators, and
> Capture units. You can look at the timing ratio between high and low or
> between high and the total cycle. I think your accuracy would be better.
PWM is certainly another option. To offset the accuracy gain, there
are two relatively minor disadvantages for my application:
* I don't need PWM or Input Capture for anything else in the
project, so it requires developing the code separately, instead of
simply integrating it with "existing" code.
* For bench testing, it is easier to come by a DC voltage source
than a pulse generator.
-- Eric
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