How to assemble a robot cart for knee rehabilitation after a stroke?

Question

Arduino

Hello. The principle of how to do it is, in fact, clear to me: on a flat surface, at least on the floor, we put the base - the same strip of plywood, under the sore leg. We attach the base to the human pelvis so that it does not come off. At the base we start up something like a "rail" along which the cart will go back and forth, and where necessary - stop.
On top of the trolley we attach the leg by the foot, the motor and the Arduino hardware platform, which will control the stops and movement. Electricity - from the network, 220AC / 24DC. I will make the basis, "rails", electricity myself, with the help of friends, of course, but the cart itself - "sorry, move over", as they say, can not do without advice.
Well, can anyone help me with this? I didn't just do it like that. My name is Ilya, I am 48 years old, I live in the Moscow region, 6 years ago I had an ischemic stroke, since then I have been a disabled person of the 2nd group, but I want to be cured, at least for a little.
What do you think?
Ilya.

Answer 1

You need a gear motor that will drive your cart.
to control the motor, you need a motor driver (you can assemble it yourself on transistors or buy a ready-made microcircuit).
The motor driver is connected to the controller (Arduino), which gives control signals to it (direction of rotation and speed via PWM ).
Plus, you also need to fasten a couple of sensors - limit switches (in a simple version, ordinary buttons will do, but you can also use non-contact ones - induction or IR), which will determine whether the trolley has reached the end section of the trajectory and at the same time the controller will have to start rotating the engine in the opposite direction.

Answer 2

Can you clarify the issue?
Should the trolley bend the leg at the joint or massage the surface of the leg from below with rollers?
How do you decide where to stop? (by pressing a button by the operator, by limit switches, or by some other signs)
And you can specifically implement it even with electric screwdrivers. to control them even with switches, from the controller, if necessary, you can even have a relay, even a PWM.

Answer 3

As drives, you can look at engines from car wipers or power windows.