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PICList Thread
'Code for v-tail mixer?'
1997\05\14@162049 by Kevin Sutter

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-- [ From: Kevin Sutter * EMC.Ver #2.5.02 ] --

I'm building a new RC plane that requires mixing both elevator and rudder
channels for a V-tail configuration. I'd like to do away with the mechanical
version and instead use a 16c84. Does any one have any code (or info) that
will accept two channels of input from an RC receiver and output a signal
directly to two servos?

Thanks.

1997\05\14@170726 by Andy Kunz

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At 04:04 PM 5/14/97 -0500, you wrote:
>-- [ From: Kevin Sutter * EMC.Ver #2.5.02 ] --
>
>I'm building a new RC plane that requires mixing both elevator and rudder
>channels for a V-tail configuration. I'd like to do away with the mechanical
>version and instead use a 16c84. Does any one have any code (or info) that
>will accept two channels of input from an RC receiver and output a signal
>directly to two servos?

Kevin,

I have a mixer based on a 12C508 with fixed mixing ratios.  I'd be happy to
burn you one if you want just tell me the mix you want.  I'll send you a
simple schematic for it, too.

It would be easiest if you give me a formula to implement the mix.  The
thing is written in assembly, but I use C to generate the code for the
mixing function.

It takes two inputs ranging from 0 to 208, producing two independent
outputs ranging from 0 to 208, with neutral at 104.  0 ==> 980uS, 104 ==>
1500uS pulse, 208 ==> 2080uS.  This implies 5uS resolution, with a 980uS
threshold.

I will work on a generic mixer with adjustable slopes shortly.

Andy

==================================================================
Andy Kunz - Montana Design - 409 S 6th St - Phillipsburg, NJ 08865
         Hardware & Software for Industry & R/C Hobbies
       "Go fast, turn right, and keep the wet side down!"
==================================================================

1997\05\14@172359 by David Jeffers

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Kevin Sutter wrote:
>
> -- [ From: Kevin Sutter * EMC.Ver #2.5.02 ] --
>
> I'm building a new RC plane that requires mixing both elevator and rudder
> channels for a V-tail configuration. I'd like to do away with the mechanical
> version and instead use a 16c84. Does any one have any code (or info) that
> will accept two channels of input from an RC receiver and output a signal
> directly to two servos?
>
> Thanks.

If you look at Circuit Celler a few years ago they had the whole works
for controlling a servo using a PIC, sorry don't know the exact date.
goto there homepage    http://www.circellar.com

David Jeffers
OSP Technologies, Inc.

1997\05\14@195340 by slm5g

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face
You can find the code for running up to 8 servos from circellar at
the ftp site I've attached below.  Looks like the issue was July
of '95.  You can order the magazine of their web site.

Hope it helps,
Ken Dougal
spam_OUTslm5gTakeThisOuTspamcc.usu.edu


David Jeffers wrote:
> If you look at Circuit Celler a few years ago they had the whole works
> for controlling a servo using a PIC, sorry don't know the exact date.
> goto there homepage    http://www.circellar.com
>
> David Jeffers
> OSP Technologies, Inc.

1997\05\14@195550 by slm5g

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part 0 60292 bytes content-type:text/html; charset=us-ascii (decoded 7bit)
ops forgot to attach it... Ken Content-Type: text/html; charset=us-ascii Content-Transfer-Encoding: 7bit Content-Base: "ftp://ftp.circellar.com/INK/" Directory of /INK

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1997\05\15@021435 by Philippe

flavicon
face
At 16:04 14/05/1997 -0500, you wrote:
>-- [ From: Kevin Sutter * EMC.Ver #2.5.02 ] --
>
>I'm building a new RC plane that requires mixing both elevator and rudder
>channels for a V-tail configuration. I'd like to do away with the mechanical
>version and instead use a 16c84. Does any one have any code (or info) that
>will accept two channels of input from an RC receiver and output a signal
>directly to two servos?
>
>Thanks.


Look at RC site in sweeden:

       ftp://ftp.luth.se/pub/misc/rc

There is some electronics RC stuff.

Regards,
       Philippe.

 +---------------------------------------------------------+
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1997\05\15@033825 by Malcolm Goris

flavicon
face
Andy Kunz writes:
> It takes two inputs ranging from 0 to 208, producing two independent
> outputs ranging from 0 to 208, with neutral at 104.  0 ==> 980uS, 104 ==>
> 1500uS pulse, 208 ==> 2080uS.  This implies 5uS resolution, with a 980uS
> threshold.

On another note, Andy, how accurate are the pulse widths from R/C
controllers. I know that they are nominally 1 to 2 ms long but do some
R/C controllers, for whatever reason, produce pulse widths outside
this range? I guess from the fact that you only have inputs from 0 to
208 that the R/C controllers never produce pulse widths outside this
range. But have you actually checked that this is the case. I am
interested in what you have to say on this because as soon as I have
my 16F84 programmer ready I want to try building an R/C speed
controller.

BTW, Did anyone else almost faint at the size of yesterday's PICLIST
digest? I was glad when I found that half of those 3580 lines were
taken up with encoded attachments and not reading material.

Mal Goris
--
http://www.nfra.nl/~mgoris/

1997\05\15@095855 by Andy Kunz

flavicon
face
>On another note, Andy, how accurate are the pulse widths from R/C
>controllers. I know that they are nominally 1 to 2 ms long but do some
>R/C controllers, for whatever reason, produce pulse widths outside
>this range?

These were based on measurements of several transmitters.  Servos respond
to widths WAY outside this range, but are not linear outside the 1.0-2.0mS
range.  Most radios typically generate LESS than full range!

>I guess from the fact that you only have inputs from 0 to
>208 that the R/C controllers never produce pulse widths outside this
>range. But have you actually checked that this is the case.

You should see the collection of transmitters.  The keyword is MOST are
between 980 and 2020, although I have some that go beyond in either direction.

>I am
>interested in what you have to say on this because as soon as I have
>my 16F84 programmer ready I want to try building an R/C speed
>controller.

Have done several.  What features are you looking for?

>BTW, Did anyone else almost faint at the size of yesterday's PICLIST
>digest? I was glad when I found that half of those 3580 lines were
>taken up with encoded attachments and not reading material.

I don't like the digest form, so it didn't bother me.

Andy

======================================================================
Andy Kunz - Montana Design - 409 S 6th St - Phillipsburg, NJ 08865 USA
             Electronics for Industry & R/C Hobbyists
        "Go fast, turn right, and keep the wet side down!"
======================================================================

1997\05\16@050426 by Malcolm Goris

flavicon
face
Andy Kunz writes:

> Have done several [RC speed controllers].  What features are you
> looking for?

Hmmm, good question. I will post this reply to the PIC list because a
lot of people have responded to Jason Brown's offer of code for a
speed controller and so there must be a lot of interest in what you or
anyone else may say, Andy. My apologies to people who have no interest
in RC hobbies.

I have a cheap forward/reverse controller already and now I want to
make one for racing (it's a Losi XX). So forward only, with low
resistance, below 10 mohms. I will probably use two or three of the
MOSFETS that have 11mohm channel resistance. I have a stock motor at
the moment but it is possible I will go to modified in the future. Are
there any hints on the maximum and continuous current ratings a good
ESC should have? I don't know whether I should bother with braking
because the car slows down quite quickly after setting the control to
neutral. I don't know about using a temperature cutout because the one
on the ESC that I already have has never operated yet. I don't know
about torque limiting because 1) I don't think I need it and 2) it
would require extra components (Op amp, pot, comparator?) to include
it. And I don't know if my Futaba RC controller is so instable that I
should use the one-touch setup system (like Novak's) or whether I can
just use a fixed set of pulse times for zero and full forward. Also, I
don't know if it useful to have an LED output that indicates when full
power is being applied. Basically, the only thing I know that I want
is the forward only MOSFETs with low resistance.

       1. Forward only
       2. braking
       3. over-temp cutout
       4. torque limiting
       5. one-touch setup
       6. LED indicator

I am tending towards features 1, 2, 5 and 6.

Mal Goris
-- http://www.nfra.nl/~mgoris/

1997\05\16@093131 by rtracy

flavicon
face
Arcamax out of Carbondale Il. has made some pic based RC stuff.  They
have a solid state gyro based on a 16c73 for helis.  There is also some
pic based speed controls for dual engine planes that keep them in
perfect sync.  I would speculate that they have all kinds of code bits
for mixing.  You will have to use information to find the number because
I don't keep in contact too much anymore.  Ask for Matt Berry or Kent
Stewart.

Rob Tracy
FotoShield

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