AVR-Chat

Again, I say, look at the Tiny26, which does come in a DIP.
I am using it for very similar type control, using solenoid
coils and linear-stepper-motor coils.
Ken


> I've looked at the higher pin count parts some but there are a couple of
> problems with them. This will be just a hand wired on perf board circuit
> to
> test and those higher pin count chips tend to be in the newer high density
> packaging. I have found a few sockets that seem to be for doing that which
> will likly end up using at some point anyway. The other is, Im not sure
> the
> ADCs will be fast enough to do what I want even with one chip per coil.
> It's
> not that the cpu won't be fast enough, but I'm not sure I'd get the
> sampling
> rate I need. The goal is to try and monitor when the coil becomes
> saterated
> by monitoring the voltage drop across it and then cutting the power and
> allowing a FWBR capture the back EMF. The turn the coil on again repeatin
> until the rotor has passed a certain point at which time the coil would be
> left off until time to fire again. each coil cpu would get 2 rotor
> signals,
> one for polarity passing magenets and when they are in line and the other
> a
> pulse train to provide postion between pole shifts. the cpu would provide
> 2
> signals used for controling the coil. The master control cpu would then
> decide how many coils need to be used at the time.
>
> The first test motor will only have 6 magnets and 5 coil pairs. But latter
> versions will have more rings of coils and magnets with each ring
> increasing
> number of magents and coil pairs by 4. It would get to be a lot of cpus,
> so
> moer centralized would be prefered. I may be able to do compairs against
> set
> voltages insted, since I'm mainly looking for the voltage to reach a
> certain
> high or low. I haven't seen any min compair speed yet lookin over the
> pdfs,
> but havn't had time to look much for that.
>
>
> ----- Original Message -----
> From: "Zack Widup" <w9sz@prairienet.org>
> To: <AVR-Chat@yahoogroups.com>
> Sent: Monday, March 13, 2006 8:37 AM
> Subject: Re: [AVR-Chat] selection for coil control
>
>
>> If you're going to do that, why not just go with one chip with more
>> pins?
>> Or do the individual controllers have to be in different locations?
>>
>> Zack
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