Switch Modifier

The switch modifier is an affordable accessibility device that enables specific switch output functions. With the provided Arduino code, the switch modifier outputs a momentary switch signal for a specific hold duration, in response to a digital input signal. Regardless of the duration of the input signal, the output can be set to any duration from 20 to 500 milliseconds. Manually turning a potentiometer allows for adjustment in output duration.

With the provided Arduino code, the intended usage is for applications that require fast, short duration switch activation, where the user’s motor control is too slow to achieve such movement. To achieve multiple switch activations, the user must release the input switch first before activating it again. Minor adjustments to the code may provide for longer output durations, or latching functionality.

Disclaimer: Construction, use and modification of this device is the responsibility of the end user. The Stan Cassidy Centre for Rehabilitation and its employees are not responsible for any damages or harm as a result of the construction or use of this device.

This device is intended for users that have difficulty pressing switches for long enough.

This build involves moderate level 3D printing and soldering

For build instructions, print files and BOM, please download here.

Print Settings:

• 0.2mm layer height
• 20% infill
• No Supports

The lid and the base are printed face up with no supports. The middle piece is printed in its intended usage orientation (lettering upright) and will require supports in the bottom battery compartment, and port holes in the walls.

Creative Commons Attribution-ShareAlike 4.0 International