Cheap Arduino Based Robotic Claw Prostetic Hand

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Introduction: Cheap Arduino Based Robotic Claw Prostetic Hand

About: lost my arm at 18, now I'm hacking stuff for disabled people (or animals)

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.

servo https://www.sparkfun.com/products/10333


clawhttps://www.sparkfun.com/products/11524


arduino unohttps://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-...

battery plug

Step 1: Program the Arduino

Download the Arduino IDE, then download the arduino servo knob sketch. i had to adjust the map values from 0,179 to 5,165. you may lose a few degrees of range, but the servo will last a lot longer not trying to grind past the stops.

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.

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    7 Comments

    Wow, that's impressive!

    How do you control the claw opening & closing? Do you twitch muscles or what?

    2 replies

    https://www.youtube.com/watch?v=xZButD_a88I

    OK, thanks.

    Nicely done! Thanks for sharing this. Very interesting project!

    https://www.youtube.com/watch?v=xZButD_a88I