Wheelchair platform - first steps

Batteries have been dead for a couple years .....  got new ones .. rather expensive - but these guys are BIG GUNS ..  LOTS OF POWER !!!

The wiring was all messed up from when I was building my own H-bridges, forgot how it all went together.  Got a Volt/Continuity tester and figured it out.

Batteries are wired in series ... so 24V with a 12V tap.  It comes with a re-charger Yay .. and it appears I have left that circuitry worky.  The control circuitry has long ago fried, and I created my own H-bridges which worked momentarily (and then fried) ..  Now I have a Sabertooth, which I am hoping will enough strength to work.

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bensonofjohn's picture

Looks like you are planning

Looks like you are planning to go the Davros route.

GroG's picture

Ya ...  pretty much .. maybe

Ya ...  pretty much .. maybe an automatic seat adjustment too :D

Mats's picture

Original electronics

What happended to the original wheelchair electronics ? I'm sure it wasn't just an on/off switch... Because if it was, that would explain what happened to the previous owner ;-)

GroG's picture

Ahahaah .. "Original"

Ahahaah ..

"Original" elelectronics was very impressive and made for safety.  They had all sorts of "chair will not move if" electronic stuff.  I kept trying to by-pass it all, until eventually I managed to fry them ...
So yes, big clouds of smoke....

And then I built my own heavy duty, super in-expensive, H-bridges ... Which worked, until I accidently hit a wall, which stalled the motor, and blew all the mosfets ...  My inexpensive design did not have overcurrent protection ... 

We'll see how the sabertooth holds up.

Mats's picture

Powerful batteries

Unprotected cables on an aluminium plate... What could go wrong ? 

At least now you have the power to make lots of smoke. Eye protection recommeded