Doug McLaren
Guest
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 Posted:
Thu Feb 03, 2005 12:57 am Post subject:
Re: Servo Pulse to voltage converter.. Mini SSC II |
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In article <1107285385.239668.184260@f14g2000cwb.googlegroups.com>,
Jon <jonspam@earthlink.net> wrote:
| I have a motor that requires a control voltage between 0-5V.. Ov=stop
| and 5V=full speed. I'm using Mini SSC IIa and need to take one of the
| servo outputs and create a voltage?
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| Is there any off the shelf device that will do this?
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| Can I just integrate the pulses and offset and scale the integration
| with an op amp circuit?
I'm not familiar with the Mini SSC IIa, but are the servo outputs it
generates compatible with R/C servos? Judging from this page --
http://www.seetron.com/ssc.htm
that's exactly what it's supposed to control.
If so, then all you need is a R/C ESC (electronic speed control) and
you're set. It doesn't really get any more `off the shelf' than that
-- the plug may even be the same.
ESCs don't generally vary the voltage. Instead what they do is turn
the power on and off a few thousand times a second, so 1/2 power =
power on 50% of the time, 25% = 25%, etc. This is more efficient than
other ways of adjusting the motor speed, and scales very well when
you're dealing with large motors (I know you're not, but ...)
Guessing that your motor is very small, something like this might be
perfect --
http://www2.towerhobbies.com/cgi-bin/wti0001p?&I=LXUR93&P=7
but there are other versions available, larger and smaller. Dozens,
possibly hundreds of other versions.
--
Doug McLaren, dougmc@frenzy.com
He who fights monsters should see to it that in the process he does
not become a monster." - Neitschze
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