Hello, I have a breadboard, an ESP32, and a relay I want to use. If I provide external power supply to breadboard, 5v on the left (for the relay) and 3.3v on The right (for the ESP), do I have to connect the ground from 5v to the ground of 3.3v in order for the 4 channel relay to work? Thank you. …

External power supply to breadboard

mongol September 25, 2021, 9:30am 3

So If a device is using 3.3v it will not be damaged by connecting it to a ground from 5v

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