When I do this stacking, it heats up. I tried connecting the SPI via ports 13-10 (no stacking), it doesn't work. Also tried connecting the ICSP via male-female wires without stacking, it works, but still heats up. So I think the ICSP has a defect? or does it? Is it supposed to be like this and I'm just being paranoid?
*PS: the heat in the "pain" level when I touch it, no burning IC odor. Maybe it's because I unplug it immediately after short use?
The W5100 Ethernet chip gets very hot. It is too hot to keep my finger on it, but that seems to be "normal". I have added a heatsink to it.
The newer W5200 and W5500 are better.
Perhaps a voltage regulator gets warm, but only the W5100 gets hot. If something else gets that hot, then something is wrong.
Stacking the boards has nothing to do with it.
