Single Switch Communication Device for Persons With Paraplegia

Many of those affected by severe locomotor disabilities caused by cerebral palsy or similar conditions may not have fine enough motor skills to control not more than one access button. This device aims to enable such persons to use a single button and a scanning method to choose, select and print chosen symbols on an LCD screen.

Step 1: Materials and Tools

Bill of materials:

  1. Arduino Uno
  2. 20x4 LCD screen
  3. 8x8 LED matrix
  4. Breadboard
  5. Jumper cables
  6. 3.5mm jack female
  7. Potentiometer
  8. 10k ohm, 220 ohm resistors
  9. Power bank and cable
  10. Nuts and bolts
  11. Access switch (
  12. Laser cut casing (file attached)


  1. Soldering Iron
  2. Solder (flux core)
  3. Wire cutter/stripper

Step 2: Circuit Diagram

Complete the above circuit diagram using jumper cables.

Step 3: Screw the Arduino to the Base

Screw the Arduino to the base piece with nuts and bolts

Step 4: Secure LCD

Attach the LCD to the front plate with nuts and bolts.

Step 5: Details of 3.5 Mm Jack and Potentiometer

Step 6: Attach Side Plates

Secure the 3.5 mm female jack and potentiometer to the side plate.

Step 7: Overview

Step 8: Attach the LED Matrix

Step 9: Final Product



    • Fandom Contest

      Fandom Contest
    • Pets Challenge

      Pets Challenge
    • Sensors Contest

      Sensors Contest