The Sensor Box connects to the Adapter, the Spa Heater, and the two photocells.
It contains the board for the temperature sensor and a board containing a humidity sensor and a board containing the humidity sensor and signal conditioning. It two 9-pin connectors: one for connecting to the Breakout Box, and another to connect to the Spa Heater and the photocells.
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Here are photographs |
| Here are the circuit diagrams |