Auxiliary Feature Controller TH

One XT60 jack for 12V power in, max current 23A. This input is voltage monitored and fused.
Two coaxial 5.5mm x 2.1mm accessory center positive 12V 4A output jacks. These are unswitched and separately fused.
Two coaxial 5.5mm x 2.1mm accessory center positive 12V 4A output jacks. These are switched and current monitored with overload protection.
One coaxial 5.5mm x 2.1mm accessory center positive variable voltage (current and voltage per the buck/boost module specifications) power output jack. This is switched and current monitored with overload protection.
Three 1/4" RCA dew heater outputs center positive 12V 4A output jacks. These are switched and current monitored with overload protection. Two of the three have associated thermistor inputs designed for 10k 3950 NTC sensors.
One USB 2.0 Hub provides 3x USB-A connections for accessories in addition to connecting to the onboard ESP32-S2 microcontroller.
Two four-pin XH connectors near the top provide variable voltage (from the buck boost), 5V, Gnd, and an accessory digital signal from the microcontroller typically used for operating servos (OTA cover for example.)
One four-pin XH connector near the bottom provides I2C for a BME280 (Temperature/Humidity are required for dew heater control.)
One fan connector to aid in cooling the solid state relays etc. This is switched and so can be controlled since the approximate internal temperature can be obtained from the ESP32-S2 microcontroller.
The ESP32-S2 microcontroller (running OnStepX) provides WiFi connectivity (including website) and USB connectivity.

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Revision History:

v1.0 First release.
v1.1 Updated layout to match SMT version.