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Wiring Layout (Current Build)

Pico W GPIO Map (in order)

GP0: reserved (UART/I2C future)
GP1: reserved (UART/I2C future)
GP2: Black 1/3 (PC817 OUT, active-low)
GP3: Black 2/3
GP4: Black Full
GP5: Grey 1/3
GP6: Grey 2/3
GP7: Grey Full
GP8: Fresh 1/3
GP9: Fresh 2/3
GP10: Fresh Full (Board B IN1)
GP11–GP17: reserved for more opto inputs
GP18: Awning EXT relay drive (piggyback COM→EXT)
GP19: Awning RET relay drive (piggyback COM→RET)
GP20: Furnace CALL relay drive (piggyback thermostat contact closure)
GP21: Water Heater relay drive (piggyback rocker)
GP22: Water Pump relay drive (piggyback rocker)
GP23: Tank TEST Black (+12V injection enable)
GP24: Tank TEST Grey (+12V injection enable)
GP25: Tank TEST Fresh (+12V injection enable)
GP26: Indoor Lights output
GP27: Outdoor Lights output
GP28 (ADC2): NTC 100k thermistor input (furnace temperature)

Power

RV +12V (fused 2–5A) into enclosure
12V→5V buck converter to power Pico W (VSYS/5V input depends on your carrier)
Common GND between RV, Pico, relay drivers, opto output-side GND.

Tank level inputs (PC817 opto boards)

Input side:

VIN+ → RV +12V
VIN− → RV GND
IN+ → tank sense wire (12V signal during TEST)
IN− → RV GND

Output side:

OUT → Pico GPIO (GP2..GP10)
GND → Pico GND Outputs are active-low.

Tank TEST outputs (+12V injection)

Use 3 high-side +12V output channels (P-MOSFET high-side recommended) driven by:

GP23 (Black), GP24 (Grey), GP25 (Fresh)

Each channel OUT is tied to the same node the physical TEST button energizes.

Water heater + water pump piggyback (dry contact)

For each rocker:

Relay COM → rocker terminal A
Relay NO → rocker terminal B

Awning piggyback (momentary 3-position switch)

At the awning switch:

Identify COM, EXT, RET Add two relays (dry contact):
EXT relay: COM→switch COM, NO→switch EXT
RET relay: COM→switch COM, NO→switch RET Firmware uses hold-to-run deadman: requires repeated EXT/RET commands; otherwise STOP.

Furnace (propane) thermostat piggyback

Relay contact in parallel with thermostat heat-call:

Furnace relay COM → thermostat wire A
Furnace relay NO → thermostat wire B

Thermistor divider (NTC 100k)

3.3V → 100k fixed resistor → ADC node → NTC 100k → GND
ADC node → GP28 (ADC2) Optional: 0.01–0.1 µF from ADC node to GND.