I have a problem that started when i changed the microcontroller of my project from an arduino uno with 5V logic to a nodeMCU board with 3.3V logic.
I have a problem now which i think comes from the fact that 3.3V isnt enough to "open" the transistor im using. The one i used when i used the arduino uno is a IRF520 transistor. But from what i've tried i cant get the nodeMCU to open the transistor... I wonder if it needs a higher voltage than 3.3V?
I also have another transistor which is a bc547. I dont know if that one will work instead. I tried looking at the datasheets but I didnt understand what i should look for really.. If anyone could let me know if it is possible to open the gate of any of these two transistors with 3.3V I would appreciate it very much.
I connected the circuit the exact same way as i had it when I used the arduino uno instead of the nodeMCU-board.