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Make: Technology on Your Time Volume 16
book

Make: Technology on Your Time Volume 16

by Mark Frauenfelder
November 2008
Intermediate to advanced content levelIntermediate to advanced
192 pages
8h 32m
English
Make: Community
Content preview from Make: Technology on Your Time Volume 16
image

Photograph by Debra Underwood

HOMEBREW

Wheelchair Safety System

By Bryant Underwood

My daughter Katy uses an electric wheelchair and last year she went off to college. Her mom and I were concerned about Katy’s safety in navigating the campus — she might get her chair stuck or have some other type of trouble and not be able to get to her cellphone.

So I used a Parallax microcontroller to control a GSM cellphone as a “telematics” system for her wheelchair. Inside the gray box mounted on the back of her chair, I use the phone in speakerphone mode with an external microphone and speaker.

The way I did this was by leveraging the old modem “AT” command ...

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Publisher Resources

ISBN: 9781680456158Errata Page