The previous Teensy 2.0 doesn’t have enough analog pins so a 3.1 will be used.
Teensy 3.1 Pinout
It’s also a good opportunity to redesign the connectors. The Grove connectors are difficult to work with for people who are able-bodied. A new connector should be used that is potentially easier for people who have mobility limitations and who are able-bodied.
This is a good time to change the connectors. I tested out snaps, they are too wide for the board side. I will need 12 switches to connect which makes 24 conductors to connect. 24 snaps around a board will be too large. 2.5 mm mono audio plugs are what I will use instead. However, the audio connectors may pose a problem on the switch side, they may be bulky and painful to wear or get in the way of a switch frame. A connector that is flat is still the best for the soft switch/sensor side so snaps will be kept.