8 Port Passive PoE Injector, Managed and Fused
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1 Project Scope
My parents' house is widely equipped with Mikrotik routers and other passive PoE powered hardware. So a centralized power distrution seems reasonable. However, passive PoE injectors like the one from Intellinet have one considerable problem:
They use a powerful PSU, capable of delivering a high current to a single port in case of a short circuit on the cable, inevitably causing a fire.
So I wanted to have a PoE injector that has a per-port fuse, however with remote diagnostic capability on broken fuses, as I can always easily ask my parents to exchange a broken fuse. I was not ale to find such a device on the market, so I built it myself.
Additional features:
- Web Interface
- Current port switching status
- Fuse status
- Syslog interface for event reporting
- Switching events
- Fuse failure events
- External powering (24V) from UPS / Battery
2 Component List
- SanDisk Micro Secure Digital (Micro SD) Speicherkarte 2 GB: Amazon: 9 €
- NEUTRIK Cinch Einbaubuchse, sw, NF2D0: Amazon: 12 €
- Neutrik NE8FDP RJ45 Durchgangs-Einbaubuchse, vernickeltes D-Gehäuse: Amazon: 9 €
- ah 19" Parts 87407V 19" Leergehäuse 1 HE mit Lüftungsschlitzen: Amazon: 44 €
- Ethernet Schild Netzwerk Network Shield W5100 für Arduino UNO R3 Mega 2560: Amazon: 7 €
- Arduino Mega 2560 R3 Microcontroller: Amazon: 35 €
- Netzdrossel: 5 €
- 10x Sicherungshalter: 25 €
- 8x Feinsicherung 500mA: 5 €
- Feinsicherung 1A, Feinsicherung 6A, 1 €
- Schrumpfschlauch-Set: 15 €
- Lochraster-Platinen: 5 €
- Stiftleisten, Buchsenleiten: 15 €
- 8x Injektoren: 30 €
- Beleuchteter Hauptschalter: 3 €
- Kabelführungen, klebend: 15 €
- Kabelbinder: 5 €
- Netzteil Meanwell 24V 150W (6,5A) MW LRS-150F-24: 25 €
- 2x DC-DC-Spannungswandler: 10 €
- 14 Ringkerne: 15 €
- 8x bistabile Doppelrelais 5V: 80 €
- BME280 Sensor: 15 €
- Cinch Stromversorgungskabel: 5 €
- Kabelschuhe: 5 €
- 8x ACS712: 70 €
- Gravitech 8 Channel ADC I2C: 20 €
- 20x R, 50 kOhm, 8x ZenerDiodes 4,5V: 5 €
480 €
3 Project Progress and Images
Trying to get a rough picture of the layout of the components.