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[DPRG] toy H-bridge hacking
Subject: [DPRG] toy H-bridge hacking
From: Dave Grubb
davidagrubb at hotmail.com
Date: Sun Aug 26 15:51:35 CDT 2007
>I have a few moving toys with H-bridges and I would like to connect up to
>them and control them with various microprocessors and sensors.
I wouldn't have thought it would be that difficult. All you need to do is
locate the inputs to the H-bridge and test what kind of signals it's
receiving. Once you've done that all you need to do is tap the input lines
(with a few diodes thrown in if you want to keep the orignal device's
functionality) and replicate those signals from the controller. Just lots of
experimentation and trial and error really.
What kind of toys are you refering to? Are you intending to tap the
transistors which form the bridge directly or is there some chip in place
already which you can use digitally? Many toys I've seen treat H-bridges as
digital devices anyway (they only turn the motors on/off, no speed control)
and only use +5 or 0v signals (old style Furby comes to mind).
Dave.
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