I would like to connect my custom-made Arduino with an Ethernet shield but I'm not so sure I can.

The problem

My board is using the design from the Arduino Mini which lacks the ATmega16U2 which does the USB-to-serial conversion and adds the ICSP pins. I think you get the point... I have only the ATmega328P on the board. Nothing else.

Is it even possible to work my way around it without adding the ATmega16U2? I can't find the chip anywhere on Ebay.

  • Are you using an IEthernet shield (using a W5200, W5500 or such like), or do you mean a generic Ethernet shield? Your title and body are inconsistent. Not that important, but a little confusing :-) Mar 15 '15 at 6:05
  • Im using the shield with the W5500. Is there any difference with the other chips? Mar 15 '15 at 10:07
  • There may be some differences, but I was just trying to clarify whether the "IEthernet", in your title, was a typo or not. I understand now, that it wasn't :-) Mar 15 '15 at 10:12

You can just connect the pins used on the shield the the corresponding pins on your custom board. Check the Schematic to see what pins are used for what (and which can be left unconnected)

The only thing you need to lookout for is, that the ethernets shield seems to require 3.3v (the shield has it's own 3.3v regulator, so you only need to connect 5v)

That 16u2 doesn't do anything but usb-to-serial. It's not needed for the ethernet shield.

The ISP header is just 5v, GND, and the 3 SPI pins and reset. But those SPI pins are also broken out to the pins 11, 12 and 13.

  • So basicaly im just using the pins 11, 12 and 13 for the shield? Mar 14 '15 at 21:07
  • Indeed those, and 10 for the ChipSelect (SS). Pin 4, if you want to use the SD card functionality. See my edit concerning the 3.3v.
    – Gerben
    Mar 15 '15 at 12:27

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