Sonar Eye For The Blind Part 2 – Geiger Counter Version

Over the past week I finally finished my Tacit glove version, and put the sonar eye code into a prototype that wasn’t dangling wires like the original. Over the next week I’ll be posting more details, but for now here’s the Sonar Eye prototype, mini version: For this version I left off the vibration motor (hard on the power supply, and hard to detect speed differences), and the sine wave (irritating over time). Instead, Oriano and I talked about a … Continue reading

Sonar Eye: Let The Blind ‘See’ Objects with Audio and Vibration

My friend Oriano Belusic contacted me a few weeks back to build him a Tacit glove, to try it out. Briefly, the device sends out a sonar ping for distance ranging (actually, two, one for the slightly left of front and another for the slightly right of front) and uses them to register how far the glove is from objects. The result is passed to two servos, each of which pushes a loop of stiff plastic into the back of … Continue reading

Another Braille Display Design

Over the last week, I’ve talked to Maxwell Davis, part of a team that worked on a Braille display design. You can read more about their project here. The design, which is similar to mine (although independently arrived at) involves rack and pinion style rods moving back and forth to create the half Braille characters. Their major difference is to add a stepper motor to each rod, resulting in a much faster refresh rate (pretty well whatever the power supply … Continue reading

A Raspberry Pi For Audrey, Perhaps?

The local Makerspace is discussing the new Raspberry Pi, a $35 PC with a credit card sized form factor. As an Arduino user, $35 is a nice price point (I can buy an Arduino Mega on eBay for about that price), but it’s no good if it doesn’t do what I need. It does. In spades. It turns out that the device outputs composite (RCA TV) or HDMI video signals, can send audio to speakers or headphone, and has both … Continue reading

How To Wire A Stepper Motor To The Arduino Conveniently

While working on my Braille display, one problem I encountered early on was motor connecting – simply put, how to connect the motors to the driver board so I could disconnect them easily. Since many driver boards have screw terminals, you’d think that’s as easy as it gets. However, try disconnecting two motors so as to redirect wires or move a motor; that means unscrewing as many as ten terminals. Plus, if you haven’t written down the order the wires … Continue reading