I've been having the same ideas...
Although, I haven't gotten around to it yet as I still need to build
something I can control :-)

It wouldn't be too hard if you have a spare channel to route to the PIC.
Then you simply route all signals through the pic and it could relay then
when PIC-control is off and override them when control is on.  (This is what
I'll be doing.)
With a simple setup it could be as simple as reading port A, then writing to
B in the OFF state, and doing it's own work in the ON state.  A simple 4 MHz
oscillator would give you 500000 transfers a second, more than enough to
keep your control perfectly smooth.

You will need some code to handle the on/off transitions... Especially if
your receiver module donesn't have a on/off signal for one of the channels.
This shouldn't ba any problem though.

Sounds like a plan?

Oh, and if anyone has a cheap but good glider I'd be very glad as building
one seems like a lot of work to justify me playing with a PIC :-)

    KreAture


----- Original Message -----
From: "stanton54" <stanton54@EARTHLINK.NET>
To: <PICLIST@MITVMA.MIT.EDU>
Sent: Tuesday, April 29, 2003 4:40 PM
Subject: Re: [PIC]: PIC/RC RECEIVER


> (tag fixed, missing colon)
>
> Controlling the servos is fairly easy. A single timer can control up
> to 10 servos. Each servo gets 2 ms for a 1-2 ms pulse (1 ms = all the
> way one direction, 1.5 ms = center, 2 ms = the other endpoint); the
> whole thing repeats at 50 Hz = every 20 ms.
>
> As others have suggested relays will be the easiest way to switch
> between PIC and manual control. You could use a servo to push a small
> switch or button to trigger all of them.
>
> The alternative requires decoding the data from the receiver, which
> could take a lot of work if you need to look at too many channels.
> If you're brave enough to dig around inside your receiver you can
> get the data from all of the channels through a single pin, which
> simplifies things. You will still however have a problem if the PIC
> crashes/gets confused/etc.
>
> Joe Smith wrote:
> >
> > I am looking to interface a PIC to some servos in a RC model. What I am
> > looking to do is be able to have the PIC control some of the servos but
I
> > also want to be able to use the transmitter in case my code does not
work
> > exactly as I had intended. Are there any resources where someone has
done
> > this before or where I can get some ideas?
> >
> > Thanks
> >
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