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Reset button
The Arduino UNO PCB features a reset button. If you intend to connect the reset pin to ground, you just need to push the button and then restart code loaded on the board.

Main IC
The main integrated circuit of the Arduino UNO board looks like metal legs. This component is the brain of the Arduino UNO board. In Arduino boards, the main IC differs. The main IC of the Arduino UNO PCB is different from another Arduino board. However, the main IC of the Arduino boards always comes from the ATmega line.

It is important to know the type of IC before you load a new program. The details of the main IC are usually written on the IC’s top side.

Components of the Arduino UNO PCB
As earlier mentioned, Arduino UNO PCB features various components which play crucial roles in its functioning. Arduino boards are available in various types. However, these components are common in Arduino boards.

USB Port
All Arduino boards feature a USB. There is a need to connect these boards to a power source. Therefore, the USB cable from a computer can power the Arduino UNO PCB. Also, this board can be powered by a power supply in a barrel jack. Arduino UNO PCB comes with a barrel jack and a USB connection cable. Another function of the USB connection is that it enables users to load code on the board.

Learn How Programming Languages Work
In the previous section, we mentioned that most computers rely on a CPU, and a CPU can understand a specific set of instructions in the form of ones and zeros.
We could theoretically write code that tells the CPU what to do by stringing together long sequences of ones and zeros in a form the CPU understands. Instructions written in binary form like this are called machine code.
A higher-level programming language provides a set of human-readable keywords, statements, and syntax rules that are much simpler for people to learn, debug, and work with.

Programming languages provide a means of bridging the gap between the way our human brains understand the world and the way computer brains (CPUs) understand the world.

Code that we write needs to be translated into the binary instructions (machine code) that the CPU understands.

Depending on the language you choose, we say that your code is either compiled or interpreted into machine code capable of being executed by your CPU. Most programming languages include a program called a compiler or an interpreter which performs this translation step.