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Arduino is a small programmable board that lets you control real electronic components with code. You can connect sensors, buttons, motors, LEDs, displays, and many other modules, then write a few lines in C or C++ to decide how everything should behave. The board reads inputs, processes them in real time, and reacts through its output pins. To start building solid projects, it is important to understand how the boards work, how to choose the right model, how to set up the development tools, and how key electronics concepts such as resistors, transistors, communication protocols, and PWM fit together in a practical circuit.

Docker is an open platform that allows developers to build, ship, and run applications inside containers. A container packages an application together with its runtime, libraries, and configuration so it behaves consistently across environments. The same container image can run on a local Linux machine, a staging server, or a production cluster with predictable results. This approach reduces environment related issues and makes deployments more structured and reproducible.

The HC-05 is one of the most popular Bluetooth modules in the Arduino ecosystem, and for good reason. It's affordable, well documented, and flexible enough to handle a wide range of use cases. It can operate as both a master and a slave device, meaning it can initiate connections to other Bluetooth devices as well as wait for them. For projects where you just need a phone to talk to an Arduino, that distinction doesn't matter much. But for anything more involved, like two Arduino boards communicating wirelessly, the HC-05 is the right tool for the job.

Every developer has been there: you push a commit, CI fails, and it turns out there was a linting error, a forgotten debug statement, or a test that nobody ran. Pre-commit hooks are the safety net that catches these problems before they ever leave your machine. They are not a complex feature or an advanced Git topic. They are just scripts, and once you understand how they work, you will find yourself reaching for them on every project.

Getting two Arduino boards to talk to each other opens up projects that a single board can't handle on its own. You might have one board reading sensors in one corner of a room and another driving a display somewhere else, and the two need to share what they know. Serial communication is one of the simplest ways to make that happen, and it works with almost any Arduino model you have lying around. This article walks through connecting two Arduino Nano boards and passing data back and forth over their serial ports.