The Arduino Uno R3 Compatible Board with CH340 is a budget-friendly alternative to the official Arduino Uno Rev3. This board is equipped with an ATmega328P-U-TH microcontroller chip, providing functionality similar to the classic ATmega328P-PU found in the official Arduino Uno Rev3. The primary difference lies in the USB-to-Serial chip, where the CH340 replaces the more expensive ATmega16U2 found in the Rev3.
This change in the USB-to-Serial chip is significant, as the CH340 is a more cost-effective solution, bringing down the overall cost of the board. However, it's important to note that this can lead to compatibility issues with certain operating systems, particularly MacOS. Users of Linux and Windows typically do not face these issues, but those on MacOS may need to follow specific procedures to ensure compatibility.
The Arduino Uno R3 Compatible Board with CH340 operates at 5V and can be powered either through a USB connection or an external power supply. If using an external supply, it is advisable to use one between 7-12V to prevent overheating of the onboard regulator.
A unique feature of this board is the additional row of holes adjacent to each standard female header. This design allows for the soldering of male headers, a second row of female headers, or even wires, providing enhanced flexibility for various projects. These can be soldered to either the top or bottom side of the board.