This device is fixed on one side of injured elbow, Accel/Gyro sensors fixed on this side of equipment can provide the motion status of arm. With pattern matching arithmetic, the movement of the arm is calculated. Base on the results, the direction and force applied on the actuator shall be calculated. Converted signal triggers PWM control on motors.
This device can add extra power for arm movement, and reduce pains if the elbow is still hurt.
Original design has more than two sensors installed. Precise sampling in RTOS shall be applied to reduce errors. So, I revise the design and improve the arithmetic to achieve similar result with only one sensor. Refer to the following sketch,