Automatic MAC address

Combining the power of the ATmega2560 MCU with onboard Ethernet, a microSD card slot, an efficient switchmode power supply, and a small prototyping area. [Product page]
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Joined: Mon Feb 01, 2016 6:56 pm

Automatic MAC address

Post by alfredo » Mon Feb 01, 2016 7:26 pm

This is my first post in the forum, so hi everybody.

I am using an EtherMega 3.0 (or at least, so it says the PCB) and tried setting up its MAC automatically as described here: ... q-qN8fkuwI

However it doesn't work. The sketch stays in the wait loop (!Wire.available())

I am using Arduino 1.6.7.

When researching this problem, I found and thought it is nice too in combination with the built in MAC. I have scratched once too many my head because of a duplicate MAC and I'd love to be able to use the MCP 24AA025E48 and also save the network config in EEPROM. Best would probably be to copy the MCP 24AA025E48 MAC to EEPROM and use NetEEPROM for ethernet setup.

Thanks for any ideas!

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Re: Automatic MAC address

Post by andrew » Mon Apr 18, 2016 10:57 pm

Can you check that the jumpers on the rear of your EtherMega PCB haven't been cut? If so, re-solder them.
See ... 24aa025e48

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