ESP32 Forum

How connect esp32 and relay of 5V, if GPIO pin is 3.3V?, in practice with me, on relay is always same status (on GPIO HIGH-LOW green led light on relay is always on, this lamp only change intesity)? I have and HW-221 level shifter and I'm afraid I'll burn the ESP32 plate.

The canonical way is to use a mosfet or BJT transistor. Random link to more info: you can safely use the first schematic presented there.