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Green circuit board with Ethernet port, small OLED screen and cooling fan attached to Raspberry Pi GPIO header

LORDWORLD

LORDWORLD Power Over Ethernet HAT (B) development board

SKU CH-N9XK-JC3JM

Adds 802.3af PoE power, a .91" OLED monitor and a controllable fan to Raspberry Pi 3B+/4B via the 40-pin header

  • Powers Raspberry Pi 3B+/4B via 802.3af PoE
  • Fully isolated SMPS delivers clean, stable power
  • 91" OLED shows CPU temperature, IP address, fan status
  • PCF8574 I2C expander adds spare IO for fan control
  • Onboard fan runs automatically or under software control

PoE HAT for Raspberry Pi 3B+ and 4B

This LORDWORLD add-on board equips a Raspberry Pi 3B+ or 4B with 802.3af-compliant Power over Ethernet. A fully isolated switched-mode supply draws power from the network cable, removing the need for a separate USB-C adaptor. The standard 40-pin GPIO header aligns directly with the Pi's connector.

Makers needing single-cable power and monitoring

Developers building headless IoT nodes, remote sensors or clustered Pi servers benefit from the integrated .91-inch OLED that shows CPU temperature, IP address and fan state at a glance. The PCF8574 I2C expander adds extra I/O for custom peripherals. Builders who lack 802.3af power sourcing equipment or who require a different single-board computer form factor cannot use this HAT.

Verify PoE injector or switch and case clearance

Confirm your network infrastructure delivers 802.3af-class power before ordering. The onboard fan and OLED module add vertical height, so ensure your enclosure provides enough space above the GPIO header. The fan can run automatically on power-up or be software-controlled via the I2C expander using a hardware switch.

Highlights

  • Powers Raspberry Pi 3B+/4B via 802.3af PoE
  • Fully isolated SMPS delivers clean, stable power
  • 91" OLED shows CPU temperature, IP address, fan status
  • PCF8574 I2C expander adds spare IO for fan control
  • Onboard fan runs automatically or under software control

Specifications

BrandLORDWORLD

Questions about this item

Do I need a PoE switch or injector that supports 802.3af to power this HAT?

Yes, the HAT is 802.3af-compliant and requires power sourcing equipment that delivers power over Ethernet using that standard.

Will the 40-pin GPIO header fit my Raspberry Pi 3B+ or 4B without blocking other HATs?

The board uses a standard 40-pin GPIO header designed for Raspberry Pi 3B+ and 4B; stacking another HAT on top depends on the height of the onboard fan and OLED.

How can I verify the OLED is showing live CPU temperature and fan status after boot?

The 0.91" OLED displays processor temperature, IP address and fan status in real time; if those values update after power-up, the monitoring is working.

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