By Hemanth Veeraghanta | July 17, 2021
We decided to try adding motors to our claw mechanism prototype. We created some very basic prototypes to test if this idea has merit. An electrical prototype would remove the need for a child to actuate the prosthetic mechanically (using their wrist or shoulders). For small children, mechanical actuation can be challenging.
A micro servo motor is used and is connected by a string to the claw mechanism where the cable is normally mounted. To control the motor, two different prototypes were made.
- The first prototype only requires a servo motor, an arduino, a 9v battery, and a push button.
- The second prototype uses EMG sensors (sensors that measure muscle activity). They are stick-on, non-invasive electrodes. The second prototype requires a servo motor, an arduino, two 9v batteries, an EMG module, and EMG sensors.
These prototypes still need a lot of work to turn them into final products, however they serve as a proof of concept. Below are links to videos of the electronic prosthetics working:
Using EMG sensors attached to forearm: https://drive.google.com/file/d/1kMcjL2Tc1wJvMMzRBhNb38Ib0vcRPmB0/view?usp=sharing