I developed this device 4 years ago for knife competitions.
Every "Knife" - immitation - has transmitter and pressure sensor (button), and detect every strike. Depending on main tablo settings it increases the score.
I got "first prototype" with rerquest to fix current issues. Main issue - PCB design done first.
Up to 16 sets of devices can be used at one time independantly.
Two sets can be connected to get four-opponent game.
CC430 was used for this devices. Schematics are typical - use DipTrace to open it.
Pcb Route and Firmware is unavailable due to commercial reason.
Referee controller and knifes use CR2032 as main power
Tablo uses 5v MircoUSB adaptor