This project came to mind after being informed Medicare wouldn't pay for a hand, only the hook. so i decided to try to make a robotic hand.The total partscost is well under $100.
arduino uno https://www.adafruit.com/product/50https://www.adafruit.com/products/80?gclid=CjwKEAjwns6hBRDTpb_jkbTv1UYSJACBhberXDZgSWJ7KN95BlWx7tvc3ZjtmcyA3Sh_lXhBqeIxOhoCW4Lw_wcB
proto board w/ potentiometer http://www.seeedstudio.com/depot/Protoshield-Kit-...
Step 1: Program the Arduino
Step 2: Wiring
Wire the servo, arduino, and pot according to the wiring diagram
Step 3: Soldering
Connect the pot and wires to the proto board, according to the diagram. When your sure everything is connected properly, begin to solder. I didnd't solder my servo connector yet, but know is the time if you plan on not taking it apart. I just used an old piece of board I recycled.
Step 4: Mount the servo
Mount the servo in the claw. This part can be a bit tricky. one bolt for mounting the servo is to long and needs trimmed, I used a dremel. If there are any problems I will post a video if there are any problems.
Step 5: Final hook up
Now attach the Arduino and claw to your arm base. This part is up to you since EVERY PROSTHETIC IS DIFFERENT!
edit. I finally got a bracket made with some scrap metal and a few bolts and nuts. The metal came from an old vcr.