My experience is limited only to Arduino UNO so far. Now, I have started working with ESP32 board which has 3.3V GPIO pins. How can I control a 5V relay using a 3.3V pin.
I know I have to use a transistor, I tried the BC547 but this thing does not trigger for 3.3V it trigger only for 5V. I tried changing the base resistor value which did not help.
What should I do now?