Hii, yes it is based on Arduino and Bluetooth classic 2.0. and the display is based on mini vibrators where the user can feel the point vibration of each dots on the braille display. This is more affordable than expensive piezoelectro mechanical display. I was looking for the best accessibility feature for Android to connect with. BRLTTY seems to be the best with good support for developers. 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.
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