The CH340 chip on an Arduino Nano V3.0 is a USB-to-serial converter, acting as an inexpensive, breadboard-friendly replacement for the older FTDI chip found on original Arduinos. It allows the Nano to communicate with a computer via USB, enabling the uploading of code and serial data transfer. This CH340 version of the Nano offers the same functionality as the larger Arduino Uno but in a compact package, making it suitable for projects with space constraints.
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