It did however sometimes work after a seemingly random number of reboots. I soon discovered that the Ethernet module wouldn’t always boot as it should. Using the same Ethernet module as Hazymat described and an Arduino pro mini clone, I first got the module to work without any problems and started developing my own code based on the webserver example. Maybe someone can benefit on my solution. Sorry to resurrect an old thread, but I have been experiencing a similar problem and actually found a solution. If it shows anything else, the SPI side of the w5100 is not working. If the serial monitor shows 192.168.2.2, then all is ok there. This is the test code I use to insure the SPI bus and the SPI side of the w5100 is working. It appears there is a pinout silkscreen on the bottom of the board, but I can't read all the pins in the pic above. So it is the ethernet shield that is not resetting then? The Arduino resets and uploads code ok? Can you post a link to the board you are using? Something that shows a pinout. If you break that small trace, the Mega will not reset when a device connects to the usb port. The two "reset en" pads should be connected by a very small trace. I've attached a pic of what I see on the Mega board. I just really want to understand the process of what happens when you reset an Arduino, and what is expected from attached shields in terms of reset electronics. Is that how it should be? Maybe it's unrelated? I see cap C7 on the right, but what is the "RESET-EN" pad? On my Mega board it looks like just a pad with no component on it. The reason I want to use these red boards is that they are smaller (lower height) than using a shield and space is an issue for my to be honest I don't quite understand the Mega2560 schematic. I feel like the solution must be staring me in the face but for a week of head scratching I just can't get close to understanding the problem! (If I understand your understanding of my understanding correctly. In summary I don't believe it's about the USB IC not resetting the Mega or the ethernet board. Needless to say I've rolled back changes (using file versioning) and pulled-apart and re-built the prototype on breadboard. Either wayĪ) the fault is not manifesting itself when plugged into a Nano V3 or the Uno R3ī) likewise if I use a different model ethernet shield (I have another one, Sainsmart) stacked onto the same Mega, using the same sketch, it works fineĬ) furthermore it did work with my Mega for a couple of weeks throughout which I made a lot of changes in the sketch. I'm guessing this means it's not resetting properly, or there could be another fault. The issue is that the ethernet board is not responding. I've tried delays starting at 50 up to I probably wasn't clear enough! The Arduino resets fine after an upload or when hitting the reset button. Also yes, I have been experimenting throughout with delays at the beginning of setup() to ensure the ethernet resets before attempting to use it. I also set the outputs low to enable W5100. Either way, I've done that now but the ethernet board still apparently won't reset properly. This wasn't required when I was working with the Nano. I hadn't explicitly set pins 10 and 53 as outputs.
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