4/11/2024 0 Comments Arduino mega pinout shieldThe IP adress write will work without a network cable attached. Try removing the SD card again after successfull SPI test, so it doesn't interfere. If the SD card SPI works, maybe you have a problem with your ethernet library. If that doesn't work, maybe your wiring is wrong. Insert an SD card and try to connect to it. It means that the IP address write to the W5500 failed, and obviously the subsequent read also. On the IDE serial monitor, if you get "server is at 0.0.0.0", then most likely your SPI connection doesn't work. Solution: shorten the outside pin rows with a side cutter pliers.Ī good starting point is the webserver sketch, because it allows for some feedback. So the ICSP header does not plug in properly into the mega, and the SPI connection sporadically drops out. However, the outside pin rows on the shield are longer than the ICSP socket on the shield. Maybe I would have never discovered these 2 problems, if I would have plugged the shield directly onto the mega. For some reason, even if there is no micro SD card inserted, the SPI bus is very flakey to the point of outright not working, if you simply leave pin 4 open. ![]() Pin 10 on the ethernet shield is CS for the W5500, and pin 4 is CS for the micro SD card reader. On the Mega, it doesn't matter if you use the ICSP or pins 50 - 52 (SPI on the Mega) You have to use the 2x3pin ICSP header on the ethernet shield instead. ![]() It turns out the ethernet shield pins 11 - 13, which are the SPI bus on an arduino uno, are NOT CONNECTED on the ethernet shield. I connected the ethernet shield to an arduino mega with jumper leads (power and SPI bus), and at first had no luck at all.
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