You may find that when you stack more than one other HAT with Sleepy Pi 2, things break and you end up stuck on the Rainbow Boot Screen aka Rainbow Screen of Death. This is due to the ID EEPROMs on the HATs conflicting. The fix is to remove some of the EEPROM communications lines from some of the connectors in the stack. I go into this in much more detail in the blog post: Raspberry Pi Rainbow Screen Of Death: How To Stack Multiple HATS And Avoid Disaster.
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