Hackaday Prize Entry: A Braille Keypad For SmartPhone

A few things stand out about [Vijay]’s braille keypad for smartphones. One is how ergonomic the plans for the final result are, sitting on the back of the smartphone such that you hold the phone much as you often normally would. Another is that it plugs in just like any other USB keyboard. And the last should make any vi user smile — you don’t have to move your fingers to type. You just press combinations of buttons already under your fingers.

It consists of a custom circuit board with an AtMega32U4, a 16 MHz oscillator, a Micro-USB connector and eight pushbutton switches.  The AtMega32U4 allows him to use the Arduino HID library. After mapping the braille button combinations to keys, the HID library sends the key values over a USB-OTG cable to the smartphone to be accepted as if they were coming from a normal plug and play keyboard.

We have to give kudos to [Vishay] for testing with blind people experienced with braille. For example, he’s learned that if the user presses [Dots 1 2] for ‘b’ followed by [Dots 1 4] for ‘c’, they prefer to not have to remove their finger from the 1 in between the two characters, for more rapid typing.  He also learned that battery management is problematic and that may be why he’s since abandoned the option of communicating over Bluetooth, leaving just USB, and thereby eliminating the need for a battery.

[Vijay]’s project is a finalist for the Internet of Useful Things Hackaday Prize and we’re eager to see what the final result will look like. But in the meantime, check out his hackaday.io and GitHub pages, and see the video below of one iteration of his keypad in use.

Braille devices seem to show up in the Hackaday Prizes every year. For example, [haydn jones] entered a braille printing press, and last year [Madaeon] entered a modular braille display that used DIY mini-solenoids for raising and lowering the dots.

7 thoughts on “Hackaday Prize Entry: A Braille Keypad For SmartPhone

      1. I never liked the Twiddler/Fiddler/Keydler system. To me, the whole point of a chorded keyer is not having to move your fingers off the keys. I like the GKOS/this project for that fact, but I also want it to be 1-handed, so I can use a pointing device at the same time. I think a “Microwriter”-style device, but as a grip instead of a flat, desk-oriented form-factor, is what would work for me.

    1. I know exactly what you mean, I’ve been wanting something like that since I first tried asetniop in a browser. I’ve thought about making my own but never really had the will…

  1. I think Apple have a patent on a tactile screen that would serve as both display and input for braille. Not that this project in’t a great hack, I like the idea a lot and even though electrostatics would make for a thinner keypad the tactile nature of the buttons is probably important too.

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