P.I.D Control for a Wearable E-Braille Using a Force Sensing Resistor Alejandro Martinez Arrieta Advisor: Dr. Mohammad Saadeh ET 494 Instructor : Dr. Cris Koutsougeras Fall 2015

Braille Alphabet Louis Braille 19th century French. Array 3 x 2 According to the National Federation of Blind @ 16000 blind enroll in school last year. The device is weareable on the dorsal side of the index finger. There are no present calues can be suitable for everyone. Increase or decrease force

Objectives Identify different FSRs using a load cell to calibrate them. Compare their mechanical properties such as, hysteresis, creep, linearity, and repeatability. Use only FSR to measure accurate forces Choose the best FSR candidate to use in a Braille-reading device with an electronic tactile display.

Objectives Design a proportional-integral-derivative (PID) control system to drive a DC-motor. The DC motor regulates the force on the finger pad. FSR provides feedback sensory of the tactile force and the finger pad.

Assembled Prototype

Testing FSR’s

Stability

DATA

Creep

Summer Chirp Signal.

Design Disk Generator

Cam Mechanism Create disks that can generate triangular and sinusoidal excitation signals that can be applied at the FSRs.

Dc Motor. Spring Bearing Shaft

SolidWorks Model

K constant F = k x

Future Progression September 2015 Order the parts and finish drawings in Solidworks. Machining the piece and print the disks. Find the K constant for springs. Put together the cam mechanism. October 2015 Collet data for each FSR using dynamic signal. Model each FSR in Matlab. November 2015 Develop a control system using LabVIEW Incorporate a PID controller into control system