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<DIV>Hmm.... I suppose it wasn't so bad after all. I guess it's the "fear
of the unknown" (AKA analog) that kept me from attempting it.</DIV>
<DIV> </DIV>
<DIV>I see 2 sets of TO-??? (like a 7805 with heat tab and 3 legs but a
little smaller) with 2 transistors connecting into them through a 1K resistor
from the control chip which says 49.xxxx MHz.</DIV>
<DIV> </DIV>
<DIV>
_____ _____</DIV>
<DIV>
o o o----o o o </DIV>
<DIV>
| <U>
| </U> </DIV>
<DIV>
<U>o o
o</U>----o o o</DIV>
<DIV>
|
|</DIV>
<DIV>trans <U>ooo</U>
trans <U>ooo</U></DIV>
<DIV>
|
|</DIV>
<DIV>
1K
1K (connect to base of trans?)</DIV>
<DIV>
|
|</DIV>
<DIV> control
chip control
chip </DIV>
<DIV> </DIV>
<DIV>I assume one is forward and one is reverse. One set is Left and one
set is Right. So then all I gotta do is cut and connect some sort of
wire/connector to connect to uCU (or back to the original control chip) and turn
on one or the other for forward or reverse and pulse the signals for
speed.</DIV>
<DIV> </DIV>
<DIV>The toy is a 1/16 scale Abrams R/C tank that takes a 9.6V battery
pack. The turret turns and the cannon cycles up/down. It has sound,
but I'm not even gonna think about that -- it's way to analog for
me. I really gotta find that one that shoots the little yellow balls
and hook that to the 1/16 which has LOTS of room in the body (place for
main brain and some sensors) and the turret (place for most of the sensors,
their controller and power supply).</DIV>
<DIV> </DIV>
<DIV>wade</DIV>
<DIV> </DIV>
<DIV>On Sun, 26 Aug 2007 21:51:35 +0100 "Dave Grubb" <<A
href="mailto:davidagrubb@hotmail.com">davidagrubb@hotmail.com</A>>
writes:<BR>> >I have a few moving toys with H-bridges and I would like to
connect <BR>> up to<BR>> >them and control them with various
microprocessors and sensors.<BR>> <BR>> I wouldn't have thought it would
be that difficult. All you need to <BR>> do is <BR>> locate the inputs to
the H-bridge and test what kind of signals it's <BR>> <BR>> receiving.
Once you've done that all you need to do is tap the input <BR>> lines
<BR>> (with a few diodes thrown in if you want to keep the orignal <BR>>
device's <BR>> functionality) and replicate those signals from the
controller. Just <BR>> lots of <BR>> experimentation and trial and error
really.<BR>> <BR>> What kind of toys are you refering to? Are you
intending to tap the <BR>> <BR>> transistors which form the bridge
directly or is there some chip in <BR>> place <BR>> already which you can
use digitally? Many toys I've seen treat <BR>> H-bridges as <BR>> digital
devices anyway (they only turn the motors on/off, no speed <BR>> control)
<BR>> and only use +5 or 0v signals (old style Furby comes to mind).<BR>>
<BR>> Dave.<BR>> <BR>>
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