There are several components:
- Drum, augmented with unwired sensors and actuators
- Drum coupling, with hollow section for water inlet & exhaust, and positioning elements
- Motor, motor controller & belt drive
- Control unit & wireless
This will be a mains or 12V powered unit depending on the kind of motor available.
To avoid slip rings, we are looking at a system like the wireless mobile charging systems, where the drum will intermittently rotate to a 'charge' position and charge the internal sensor and acutator harness. The sensors mounted on the drum will communicate with BLE to the control unit to save power.
There will be a simple lid on the side for adding waste material & ejecting compost