c131a97ac4
- 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)
2.9 KiB
2.9 KiB
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