VCC lines should be 5V or 3.3V?

[amchagas]

• The ESP32 runs 3.3V IOs that are 5V intolerant.
• The beehive main board has a 5V power line, which might not be the best case scenario for the power line, considerning the point above.

So the question is, should we have just a 3.3V power line, so that the whole system is simpler, harder to damage (as acidental 5V input into the 3.3V IOs will damage them?)

Another potential solution would be to make adaptors that sit on the connectors of the main board and have level shifters built in them.

[amchagas]

One point for having VCC at 5V is that some of ICs require 5V for power. But we should double check which ones need that, and which ones cn be powered with 3.3V?