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

TomGeorge September 25, 2021, 9:39am 4

Hi,

No as long as its the gnd of the 3V3 supply and the gnd of the 5V supply.

Tom...