The Arduino Nano and Uno are equipped with very similar processors (the chip that essentially serves as the brain of the board). The Nano features an ATmega328, while the Uno sports an ATmega328P.

[Ihsan Kehribar] wrote a quick post to show how it’s done. You’ll find an FTDI chip on Arduino boards that have a USB connector. It’s used to handle the USB communications on one side ...

For those worrying that [Faransky] is relying on the PWM functionality of the Arduino Nano to generate waveforms ... as a voltage divider on the chip’s output. To wrap up the build, he added ...

Apart from understanding the Arduino's code language ... In addition to this main processor, the Nano also has another chip on board, the FTDI FT232RL, which handles USB communication as the ...