This time I will describe a simple and practical way to enter the world of microcontrollers, specifically Arduino. Arduino is an open-source electronics platform that combines simple hardware (microcontroller boards) and software (Arduino IDE) to let anyone build interactive projects like robots, sensors, or smart devices. It’s widely used by beginners, hobbyists, and professionals because it’s affordable, easy to learn, and supported by a huge global community.
 Namely, during the school year I conduct practical training for students from a local vocational school. In the practical exercises I used a standard breadboard on which the components were connected with wires.

However, it often happened that the device did not function even though it was connected exactly according to the scheme, and the reason for this was poor contacts and parasitic oscillations that occur due to the proximity of large metal surfaces in the breadboard. The kit I will present to you is a solution to all these problems and is very practical for both beginners and advanced users.

The kit is in the form of a plastic tool box with a handle that contains all the necessary elements and is ready to work immediately after opening. This saves valuable time, especially when developing a software project. Let's see what's inside the box.

Besides the necessary cables, there is also a moisture sensor, an infrared remote controller, and accessories for the servo motor. There is also the microcontroller board that needs to be mounted on the appropriate base.
Now the main part: the lower half of the case is actually a large PCB on which, in addition to the MCU, all the other components are mounted. These are mainly various sensors, then displays, servo motors, LEDs, relays and linear potentiometers. All these components are connected to the corresponding pins of the Arduino board that are marked next to the sensor. For example, the servo is connected to pin D9, and the relay to D4.

So all these sensors and components are connected to a specific pin on the microcontroller via the PCB lines. This means that there is no need for any wiring or soldering.
On the Elecrow Wiki page you can download a PDF manual of over 170 pages, which describes in great detail with pictures how to install Arduino IDE with proper support for Arduino Nano R4, and install the necessary libraries.
  Then, more than 20 hardware and software projects that use these sensors are also described in detail. You can download the complete codes for these projects on the given GitHub page.

  In this way, creating any of the proposed projects is extremely simple. It is enough to just upload the desired code and the project is ready. In the manual, each line of the code is described very extensively and step by step.
Now I will practically present you the creation of one of the given projects. For example, let it be "Servo Example". We start the Arduino IDE and select the Arduino Nano R4 board.

Now we copy the code from GitHub and paste it into the IDE. Previously, I copied all the given libraries into the Documents-Arduino-libraries folder. Then I connect the USB cable and select the appropriate COM port, in this case COM15 and press Upload. In a short time, the uploading is completed and the project is ready.

As I mentioned at the beginning, the kit is adapted for both absolute beginners and more advanced users. For example, we can expand the given codes with additional functions, but also create and test completely new code that would use one of the given sensors. And that's not all: There are two I/O connectors on the PCB, one for serial communication and the other with analog inputs, to which we can also connect one of the many external ElekroW sensors without soldering.
  Now I will present you a test of one of my previous projects (Spectrum Analyzer) where the code was adapted specifically for this device.

  And finally a short Conclusion. Whether you're just starting with Arduino or looking for a fast and reliable prototyping platform, this Elecrow Starter Kit is an excellent choice. It saves time, eliminates wiring problems, and makes learning electronics both simple and enjoyable.