Bought two lawnmower wheels with gears from Jacks SmallEngine site. Connected them to two car, electric window motors. Used a transistor circuit connected to pins of an Arduino mega to make the motors turn CW or CCW to turn the wheelchair or move forward or backwards. I am a mechanical engineering evening student that putters around with arduino and raspberry pi boards I bought from Electronics Plus in Littleton MA. I can use a remote to move the wheelchair from a distance.
, https://i.ytimg.com/vi/Qsljrm_0exQ/hqdefault.jpg
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2021-04-07