How to use 3.3 volt pin in Arduino NANO?

Question

Arduino

The Arduino Nano is powered by the 5V and GND pin, and the NRF24L radio module is connected to the 3.3V pin, but I read that the 3.3V pin only works when powered by USB, how to be in this situation and make the 3.3v pin work?

Answer 1

take a diagram of your board and see how the power is made there.
most likely 5V is just directly connected to 5 volts usb.

Answer 2

The Arduino Nano does not have a separate 3.3V regulator. 3.3V is the internal voltage reference of the USB-UART converter chip (FT232R, CH340G). Typical load capacity up to 50mA. Although the NRF24L consumes a maximum of 11-13mA, for stable operation of the module, it is strongly recommended to supply a capacitor up to 100 uF or power it from a separate 3.3V source.

Answer 3

1. There is always 3.3V when there is 5V and the 3.3V stabilizer is working properly
2. Connecting NRF24L to the Arduino 3.3V is a very bad idea. There are special adapters