Variable Voltage from PC Port

D

Danny Tuppeny

Guest
I'm trying to control an RC transmitter from my PC. The transmitter
contained two potentiometers (one for each stick) which varies the
voltage across the centre wire between approx 1.4v and 2.3v (with approx
1.9v being centre).

Of the three wires to the potentiometer, it's my understanding that I
can ditch one (the black one), and just a variable voltage across the
other two, and it should simulate the stick movement. However, all
output from the pc (for example, serial/parallel) is digital, and I've
no idea how to drive something that could vary the voltage. Can anyone
point me in the right direction?

Thanks,

Danny
--
Danny Tuppeny
http://dot-dot-com.com/

You've just gone up in my estimation and are no longer beneath my contempt
 
On Sun, 14 Nov 2004 13:02:17 +0000, Danny Tuppeny
<nospam@nothing.oops> wrote:

I'm trying to control an RC transmitter from my PC. The transmitter
contained two potentiometers (one for each stick) which varies the
voltage across the centre wire between approx 1.4v and 2.3v (with approx
1.9v being centre).

Of the three wires to the potentiometer, it's my understanding that I
can ditch one (the black one), and just a variable voltage across the
other two, and it should simulate the stick movement. However, all
output from the pc (for example, serial/parallel) is digital, and I've
no idea how to drive something that could vary the voltage. Can anyone
point me in the right direction?
Click to expand...
That right direction could be the printer-port :)
With some resistors and a driver you can convert it into an 8-bit
DA converter.
(or, alternatively: 2 4-bit converters)

--
Kind regards,
Gerard Bok
 
On 14/11/2004 14:53, Gerard Bok muttered:

That right direction could be the printer-port :)
With some resistors and a driver you can convert it into an 8-bit
DA converter.
(or, alternatively: 2 4-bit converters)
Click to expand...
I was hoping it'd be that port, it looks easiest to program!

Do you know if there any such device to do what I want (parallel ->
analogue/variable voltage) in production (that's cheap!), or where I
might find some docs on making my own?

Thanks
--
Danny Tuppeny
http://dot-dot-com.com/

Try and be brave, and ignore the fact that nature's been very cruel to you
 
On Mon, 15 Nov 2004 07:31:51 +0000, Danny Tuppeny
<nospam@nothing.oops> wrote:

On 14/11/2004 14:53, Gerard Bok muttered:

That right direction could be the printer-port :)
With some resistors and a driver you can convert it into an 8-bit
DA converter.
(or, alternatively: 2 4-bit converters)

I was hoping it'd be that port, it looks easiest to program!

Do you know if there any such device to do what I want (parallel -
analogue/variable voltage) in production (that's cheap!), or where I
might find some docs on making my own?
Click to expand...
Sure!
http://www.hut.fi/Misc/Electronics/circuits/dacs.html

And there are plenty more :)

--
Kind regards,
Gerard Bok
 
"Danny Tuppeny" <nospam@nothing.oops> wrote in message
news:41975754$0$33594$ed2619ec@ptn-nntp-reader02.plus.net...
I'm trying to control an RC transmitter from my PC.
Click to expand...
I think the usual way to do this is to simulate the pulse stream on the
buddy-box connector. eg The stream of 1-2mS pulses after the encoder.

That way you can control all the channels with "no" external circuitry.
 
"CWatters" <colin.watters@pandoraBOX.be> wrote in message
news:kk7md.24384$l93.1317918@phobos.telenet-ops.be...
"Danny Tuppeny" <nospam@nothing.oops> wrote in message
news:41975754$0$33594$ed2619ec@ptn-nntp-reader02.plus.net...
I'm trying to control an RC transmitter from my PC.

I think the usual way to do this is to simulate the pulse stream on the
buddy-box connector. eg The stream of 1-2mS pulses after the encoder.

That way you can control all the channels with "no" external circuitry.
Click to expand...
or buy a serial port to buddy box cable from here ...

http://www.rc-electronics.co.uk/pcbuddy.htm

Note this device allows the PC to control the RC. It's NOT a joystick
adaptor that allows an RC TX to be used for PC gaming, although this company
also sells those.
 
On 15/11/2004 10:10, Gerard Bok muttered:

Sure!
http://www.hut.fi/Misc/Electronics/circuits/dacs.html

And there are plenty more :)
Click to expand...
:)

I've been exchanging emails with the owner of that page all day, and he
gave me some good ideas. However, I need two channels, so first of all,
I'm going to give this a go:

http://www.analog.com/en/prod/0%2C2877%2CAD5332%2C00.html

Ordered a few before - will see how I get on with them and a board! :)
--
Danny Tuppeny
http://dot-dot-com.com/

Programming is like sex: One mistake and you have to support for a lifetime.
 
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