A WCH CH582F based Bluetooth controller for wireless keyboards. It is ideal for converting Serial keyboard to Bluetooth keyboard. It includes a LiPo charge circuit. also a inverter to handle RS-232 level Serial. It is super thin so can be installed directly inside the keyboard you want to mod.
This board is used in two of my projects: ppk_bluetooth, and g750_bluetooth. It can potentially be used to convert Serial mouse, or even PS/2 or ADB keyboard/mouse to Bluetooth, but you would need to implement the protocol yourself.
Please refer to the compilation guide.
Please refer to the download guide.