[BRLTTY] Help to create a new braille device
Dave Mielke
Dave at mielke.cc
Fri Jun 25 07:19:55 EDT 2021
[quoted lines by Jagdish Panda on 2021/06/25 at 15:43 +0530]
>the display is based on mini vibrators where the user can feel the point vibration of each dots on the braille display.
What's that like on the battery, though.
>This is more affordable than expensive piezoelectro mechanical display.
The Piezzo electric crystal approach may be more expensive per dot, but it only draws on the battery whenever a dot's position needs to be changed. After that, the dot's position is maintained by a charged capacitor which only needs to be replenished every once in a long while. So, although the hardware cost is greater, the battery cost is lower. It's an interesting trade-off so I'm curious.
>After having a glance at the code, I couldn't figure out what is the protocol to be followed to communicate with BRLTTY, how to send key inputs and receive data. Also what drivers to use.
Brltty doesn't have a specific protocol. If you've looked at the code then you know that it has a lot of drivers. That's because, for the most part, each braille device manufacturer uses its own protocol. And, in case you're going to ask, no, I don't think there's such a thing as the best protocol. Each one has typically been designed to support the kinds of controls that it's manufacturer is using.
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