Robotics

I've been working on this same idea as I have a close friend with the same... He's in a chair & only has use of one arm & his head. I'm also losing control of my lower back & legs, so I'm trying to come up with something that will keep me walking, rather than just using a chair...

Building the framework is the easy part... I prefer 2020 aluminum extrusion, as it's cheap, easy to work with, & you can attach just about any type of hardware to it... 10 1-metter lengths usualy cost around $70 on Amazon. I bought a 3018 CNC router for under $200 to mill parts from aluminum plate for the joints & hardware... You can do experimental parts on a 3D printer, but for actual use, you'll want metal.

The biggest hurdle is always how to power it. hydraulics and pnumatics seem like an easy answer, untill you start adding all the pumps, valves, relays and tubing... That's why every single build you see using them is powered off body by a big umbilical bundle. LiPo batteries have come along way, and can supply enough power for extended use while being light enough for on body use...

Personaly, I'm a fan of electric pistons, and plain old NEMA steppers. You simply can't beat them in terms of torque to cost ratios...

There are 2 types of electric pistons- 1 uses a motor & screw feed, the other uses a coil of memory wire to replicate air or fluid pressure. These are expensive though, and don't generate high enough push/pull power to support bodyweight. I've been playing around with push/pull electric solenoids, but so far they just don't have reliable control of range between all in & all out...

I ordered five mg 940 servos ,EMG sensor bearings and some very tiny ones ,arduino micro. I have heart rate sensor that i want in it its crazy how small is it.

And i will see what i can do with that.

Thanks for response.

.And building something like this was my dream when i was ten years old.

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