ThumbsUp! keyboards can be made wireless. Not all of them, but those driven by ProMicro controller. There are multiple options, so far I only used one of them, the nice!nano v2 with ZMK-based firmware. Nice!nano is a drop-in replacement for AtMega32U4-based ProMicro units. It got a compatible pinout and is quite simple to use. Here is how it looks fully assembled: These are the parts: nice!nano v2 in the middle, the battery on the left and the pin headers on the right. Also there is a power switch on the PCB - it physically disconnects the battery from MCU/USB. I use pin headers/sockets to allow MCU swap. The default/standard sockets are too tall, so I have to pull the pins from headers and cut them so they are flush with the board surface. Make sure solder balls are small enough to allow the raisers/connectors to actually connect. Notice the MCU goes components towards PCB. Make sure the B+ and B- holes are not used, they are added in nice!nano, but the ProMicro does not ha...
User manuals and related materials for ThumbsUp! keyboards I sell on Etsy and eBay.