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Create a PCB's for each module that interconnect via standard 3-wire and 4-wire connectors. A PCB specifically for:
- Mains AC v3 module
- RTD Temperature sensing module
- Relay module (may be able to use modules available for this)
- multiple input pulse counter
- Compatibility with the nuelectronics datalogging board.
Develop a baseboard that is an Arduino with normal shield headers but also with 3-wire and 4-wire connectors on the same PCB.
Develop a baseboard that is an Arduino with normal shield headers, 3-wire and 4-wire connectors and also tri-state buffer for master/slave network operation.
An barebones arduino with a CT or pulse input module and RF transmitter socket all in one.