Posts with tag: deaf







Target issues for a web-cam switch

| tags: blind, deaf, enabling technology

I can reliably detect many simple targets and generate key events in real time using a web-cam and an ordinary piece of paper with printed targets. What are the important characteristics of the targets?

  1. They must be meaningful to the user.
  2. They must be detectable and easily distinguished from whatever will obscure them by the computer.
  3. They must have an associated key, mouse or other event to control the computer.

more...


The motors work great with the USB-1024HLS!

| tags: blind, deaf, enabling technology

The tiny pager motors ( VPM2 from Solarbotics) work great with the USB-1024HLS. I can drive them with the 15mA source capacity of the USB-1024HLS. Using duty-cycle modulation I can control the strength of the vibration. The 4-wire cable I used for each set of 3 is too stiff allowing vibration to couple from one to the next. I'm going to switch to long flexible pairs stripped from a flat cable. That should allow more freedom in placement and less coupling.

more...


USB-1024HLS Digital I/O

| tags: blind, deaf, enabling technology

I bought a USB-1024HLS from Measurement Computing for an experiment with tiny pager motors as a cheap Braille display. For $149 you get a tiny brick with screw terminals. It works great. Their library is easy to use from Python using ctypes. I'm guessing USB timing limits it to 125 updates per second. I've got it blinking LEDs while I'm waiting on the pager motors to arrive.

more...



Next Page ยป