Arduino is an open-source hardware and software platform that enables you to create interactive electronic projects. Arduino boards use a variety of microprocessors and controllers. The boards are equipped with sets of digital and analog input/output (I/O) pins that may be interfaced to various expansion boards (‘shields’) or breadboards (for prototyping) and other circuits. The boards feature serial communications interfaces, including Universal Serial Bus (USB) on some models, which are also used for loading programs. The microcontrollers can be programmed using the C and C++ programming languages (Embedded C), using a standard API which is also known as the Arduino Programming Language.

Here’s a brief overview:
- Hardware: Arduino boards are the heart of the platform. They consist of a microcontroller (usually from the Atmel AVR family), input/output pins, power supply, and a USB interface. The most common board is the Arduino Uno.
- Software: The Arduino IDE (Integrated Development Environment) is used to write, compile, and upload code to the Arduino board. It uses a simplified version of C/C++.
- Programming: Arduino programming involves writing code to control the behavior of the microcontroller. The code is composed of two main functions:
setup()(initialization) andloop()(repetitive execution). - Libraries: Arduino provides libraries for various functions like controlling LEDs, reading sensors, and communicating with other devices. These pre-written code snippets simplify programming.
- Input/Output: Arduino boards have digital and analog pins. Digital pins can be set to HIGH (5V) or LOW (0V), while analog pins can read varying voltage levels (analog signals). These pins can interact with various components like LEDs, sensors, motors, etc.
- Projects: Arduino is used for a wide range of projects, from simple blinking LEDs to complex robotics and home automation systems. It’s popular for its accessibility and ease of use for both beginners and advanced users.
- Communication: Arduino can communicate with other devices using protocols like UART (Serial), I2C, and SPI. This allows integration with sensors, displays, and other microcontrollers.
- Power: Arduino boards can be powered through USB, a power jack, or an external power source. Different boards have varying power requirements.
- Community: Arduino has a large and active community. You can find tutorials, forums, and resources online to help you troubleshoot, learn, and share your projects.