gnupic: Re: [gnupic] 16f628
Subject:
Re: [gnupic] 16f628
From:
Maxime Larocque ####@####.####
Date:
3 Jul 2005 04:39:35 +0100
Message-Id: <42C76110.602@yahoo.ca>
MvH wrote:
> Hello,
>
> I'm learning pics the hard way: by faillure it seems :)
>
> I got some pics 16f628 in a hardware programming class, but after
> trying to use them in a small project that involves a sharp IR sensor
> ( outputting a voltage range of 0.2 to 2.4 V) I found that the ANx
> pin's aren't analog ADC but comparators; I'm looking for the right
> kind of circuitry to create one ( sigma delta thing?) is anyone on
> this list experienced in this? or would trying to get my hands on
> 16f88 ( with adc) be a better solution.
> I currently have no experience in assembler - I use jal for now - are
> there better suggestions? is pyastra the way to go?
I am mainly using the 16f628 (and the a) in my project. It's cheaper to
buy them in 25-packs from digikey...
I think you can use the internal voltage reference to feed one input of
the comparator, thus enabling you to build a simple ADC. The only
problem is that the voltage reference is somewhat limited, since if I
remember well it has only a 16 or 32 steps resolution. Check out the
Microchip reference manual of the pic16f628 for more info, it is pretty
clear. Check out the speed and precision of the voltage reference, to be
sure it meets your needs.
I have no experience with the 16f88, and I did not really had a need for
a good ADC yet.
Good luck!
Maxime
