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root c131a97ac4 Add PoE variant with W5500 Ethernet and 802.3af power

- W5500 SPI Ethernet controller for wired connectivity
- Silvertel Ag9905MT PoE PD module (48V to 5V)
- RJ45 connector with integrated magnetics
- Higher camera resolution (1024x768 vs 800x600) using wired bandwidth
- WiFi fallback if Ethernet disconnected
- Separate BOM, pin mapping, ESPHome config
- 3D-printable enclosure (50x40mm, larger for RJ45)

2026-03-29 13:00:07 -05:00

2.9 KiB

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Presence Sensor - PoE Variant

Same sensors as the USB-C version, but powered and networked via Power over Ethernet (802.3af).

Key Differences from USB-C Version

Feature	USB-C Version	PoE Version
Power	USB-C 5V	802.3af PoE (48V → 5V)
Network	WiFi only	Ethernet (wired) + WiFi fallback
Connector	USB-C	RJ45
Extra chips	None	W5500 (Ethernet) + AG9905MT (PoE PD)
Board size	45x35mm	50x40mm (RJ45 is bulky)
Reliability	WiFi dependent	Wired, rock-solid
Cost	~$32	~$42

Why PoE is Better for Cameras

No WiFi congestion - camera streams are bandwidth-heavy
Single cable - power + data in one Ethernet run
More reliable - no WiFi dropouts
Centralized power - PoE switch manages all device power
Remote reboot - cycle PoE port to hard-reset device

New Components

W5500 Ethernet Controller

SPI interface to ESP32-S3
10/100 Mbps Ethernet
Hardware TCP/IP stack (offloads ESP32)
QFP-48 package (7x7mm)
JLCPCB: C32843

RJ45 with Integrated Magnetics + PoE

HR911105A or equivalent
Includes PoE center-tap connections
Through-hole (adds height but very robust)

PoE PD Module - Silvertel Ag9905MT

IEEE 802.3af compliant (up to 13W)
48V input → 5V/2A output
Tiny module: 16.5x14.5mm
Isolated, protected
Alternative: AG9905M-R or TI TPS2376 discrete

25MHz Crystal Oscillator

Required by W5500
3.2x2.5mm SMD package

GPIO Changes for PoE Variant

GPIO	USB-C Version	PoE Version
GPIO19	USB D-	Free (no USB)
GPIO20	USB D+	Free (no USB)
GPIO33	Free	W5500 SPI MISO
GPIO34	Free	W5500 SPI MOSI
GPIO35	Free	W5500 SPI SCK
GPIO36	Free	W5500 SPI CS
GPIO37	Free	W5500 INT
GPIO42	Free	W5500 RST

Camera, mmWave, PIR, I2C sensors - all unchanged.

Power Path

PoE Switch (48V)
    │
    ▼
RJ45 Connector (center-taps)
    │
    ▼
Ag9905MT PoE PD Module
    │ (48V → 5V isolated)
    ▼
5V Rail ──→ LD2410C (direct)
    │
    ▼
AMS1117-3.3
    │
    ▼
3.3V Rail ──→ ESP32-S3, W5500, sensors, camera LDOs

Power Budget (PoE)

Component	Voltage	Current
ESP32-S3	3.3V	240mA
W5500	3.3V	132mA
OV5640	2.8V+1.8V	140mA
LD2410C	5V	60mA
AM312 + SHT41 + BH1750	3.3V	3mA
Ag9905MT overhead	-	~50mA
Total from PoE	48V	~180mA @ 48V (~8.6W)

Well within 802.3af's 12.95W limit.

Board Layout Notes

RJ45 connector at bottom (cable exits down for wall mount)
Ag9905MT module near RJ45 (short high-voltage traces)
W5500 between RJ45 and ESP32 (short SPI traces)
Camera at top (unchanged)
mmWave on right (unchanged)
PIR on left (unchanged)
Sensors on left edge (unchanged)
Board slightly larger: 50x40mm to accommodate RJ45 jack height

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