PoE FeatherWing

by Silicognition LLC

Ethernet FeatherWing with 4 W of PoE power and globally unique MAC

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of $4,000 goal

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PoE FeatherWing

A FeatherWing that provides Ethernet, up to 4 W of power, and a globally unique MAC to your Feather. Headers are included, but not soldered.


Recent Updates

As Featured In

Clive Maxfield High-Tech Consulting

"Well, I for one am very impressed. It always amazes me when someone like Patrick looks at something like an Ethernet FeatherWing and says to themselves, “Hmm, not bad, but I can do better.”"

Adafruit provides an Ethernet FeatherWing peripheral board for its popular Feather ecosystem of development boards—a valuable option for IoT and automation projects. But it has its limitations. The Feather still needs to be powered separately, and no built-in globally unique MAC address is provided for the user, making deployment hard.

What if we could fix these issues? What if there was a drop-in replacement that would not only provide Ethernet, but also power your Feather, and give you a globally unique MAC? And still be 100% compatible in size, connections and software support? Enter the PoE-FeatherWing!


  • PoE: Isolated IEEE 802.3at Class 1, Mode A and Mode B Power over Ethernet, with 4 W of output power available
  • Globally unique MAC address: A Microchip 24AA02E48 provides a built-in globally unique MAC address, allowing actual field deployment without having to change and recompile code for each device.
  • Works with existing software: A WIZnet W5500 Ethernet controller ensures full compatibility with existing software written for the Adafruit Ethernet FeatherWing.
  • Arduino driver: Works with the standard Arduino Ethernet driver
  • CircuitPython driver: Works with the standard CircuitPython WIZNET5K driver
  • Drop-in replacement: With board size and connections identical to the Adafruit Ethernet FeatherWing, it's a true drop-in replacement
  • Giant Board compatibility: A solder jumper allows for easy compatibility with the Giant Board Feather form-factor Linux SBC, without needing to add a fly wire for the IRQ (Interrupt Request Signal).

Simple Ethernet + Power for Your Feather Projects!

Arduino and CircuitPython example code is available on GitHub. This code includes examples like Arduino "Web Client Repeating", which allows you to make repeated HTTP requests using DNS, as well as others.

Ethernet FeatherWing running Arduino demo code

Specifications Compared

PoE FeatherWingAdafruit Ethernet FeatherWingwESP32
ManufacturerSilicognition LLCAdafruit IndustriesSilicognition LLC
Ethernet systemWIZnet W5500WIZnet W5500LAN8720A + ESP32
Ethernet throughput~13 Mbps~13 Mbps~90 Mbps
Ethernet MACGlobally unique - provided by 24AA02E48Manually appliedProvided by ESP32
PoE power4 W0 W13 W
Output voltage4~5 V0 V12 V or 5 V + 3.3 V
Form factorFeatherWingFeatherWingCustom
PCB size55.9 x 22.9 mm55.9 x 22.9 mm75 x 40 mm
CPUFlexible, off-boardFlexible, off-boardESP32, on-board

Early Bird Rev 2 Board

Testing of the initial 100 units showed a few small things that could use improvement. Most users would never notice a difference in normal use, so we are offering 100 early bird boards at a discount price, and they will ship shortly after the campaign ends.

Here is an explanation of the small differences in the early bird boards:

  • Flyback transformer The first hand-built prototypes used a flyback from Hanrun, and performance was characterized with them. The 100 initial run units were built with supposedly equivalent transformers from Link-PP. Unfortunately, they’re not perfect equivalents. Turns out they have more parasitic inductance, which causes more ringing on the output, which in turn heats up the secondary diode more. So these samples have slightly lower output capability and likely higher EMI. Rev 3 production will be built with transformers from Hanrun.

  • Output regulation The goal is to have lower-than-5 V output so as to not interfere with USB when plugged in on the Feather. It’s a bit lower than it should be, if someone wants to use the lithium battery charging on their Feather.

Rev 2 UnitsRev 3 Units
Minimum voltage under load4 V4.3 V
TransformerLink-PP with higher EMIHanrun with lower EMI
Max output power*3 W4 W

*A USB-powered Feather only supports 2.5 W, so both 3 W and 4 W are just fine.

Support & Documentation

Project development logs can be found at the Hackaday.io project page.

Fulfillment & Logistics

See the ordering, paying, and shipping section of The Crowd Supply Guide for fulfillment details.


Silicognition LLC

Silicognition LLC is an electronic design services company that focuses on deeply embedded, IoT and low power systems.

Patrick Van Oosterwijck


Manufacturing Partner

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