Braille Exerciser with audio feedback

When I saw RIDBC's Braille Swing Cell, I thought the hinge that could transform the braille cell into a perkins brailler was a really brilliant design. After printing it out, I thought it would be even better if this tool has audio feedback. So here is this braille exerciser with voice feedback.

Features:

1. As the RiDBC's original design, this tool shows the braille cell when folded, and show the braille keyboard when unfolded.

2. This exerciser is powered by a enclosed single cell 18650 power bank, so it can operate independently. It can also be powered by any 5v power bank or phone recharger. If the battery dies, the user can easilly replace it with a new one.

3. All the wires are hidden inside the case as to prevent interference and shortage when folding.

4. This exerciser has an internal speaker and 3.5mm audio jack for headphones or external speakers. The internal speaker will mute when a headphone or external speaker is plugged in. When multiple users want to use their own exercisers together in the same classroom, they can use their headphones so that they will not interfere with each other.

5. This tool uses Arduino nano board, so can be customized to any other languages. The current version is for Traditional Chinese.

6. The current dot distance is based on asian children aged 7-9, but can be adjusted to fit different users.

This version is done about one year ago but stopped developing for some personal reasons. The case, circuit and codes have gone too many iterations, and I am really not a good version keeper. I will upload the complete files later when I figure out which ones are correct files.