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Crystal Clear Electronics Curriculum

An innovative electronics curriculum with real-world examples and step-by-step instructions from basic mathematics to programming microcontrollers and basic control applications.

Recommended for students and hobbyists, ideal for extracurricular courses or self study.

Atmel information package (microcontroller datasheet, IDE installation guide, debugger description)

Mobile application

The course material is also available via a mobile application called „Kristálytiszta Elektronika” or „Crystal Clear Electronics” - depending on the language and region settings of the Android device - on Google Play. It also contains the data sheets related to the free course material in an organized manner! The application will be updated in parallel with the publication of new parts of the curriculum.

Get it on Google Play        Download on the App Store


The Crystal Clear Electronics videos are available in video format! Each chapter of the curriculum is divided into several short videos to make the content more accessable. You can find every chapter’s first video below the chapters’ links, or you can also open the full playlist here by clicking on the YouTube logo:

YouTube playlist


The mastermind of the curriculum briefly describes the path that led him into the world of electronics. Partly because of the trials he experinced, raised the need for this curriculum, therefore it is worth reading for everyone interested in electronics. "When I asked my friends, I have made throughout my journey, to make this curriculum together, everyone was eager to share their knowledge and experience so that your ride of learning electronics will be faster and less bumpy than mine was."


01 Revision of Basic Mathematics

The author(s) of the chapter: Zsolt Verasztó

Technical Science and therefore Electronics is based on Mathematics. In order to make it easier for everyone in the recommended age group of 15-18 to understand the later chapters of the curriculum, it is worth repeating and overviewing the necessary mathematical studies. The first chapter helps to accomplish this.


02 Revision of Basic Physics

The author(s) of the chapter: Szabolcs Veréb

"All beginnings are difficult!" - every new profession requires preliminary studies. While Mathematics is the foundation of Technical Sciences, Physics is the means of describing and understanding the natural phenomena around us, so understanding the fundamentals of Physics is essential to understanding electronics and the following chapters.


03 Electronic Symbols

The author(s) of the chapter: Károly Póka

"New life, new language, new symbols!" - a road to the world of circuit diagrams. Our circuits are complex working systems with many different components. To describe these, a symbol system has been defined, so that complex circuitries can be represented on unified drawings for everyone. Learn about the most basic parts, their symbol, other properties and constraints of wiring diagrams!


04 Laboratory Power Supply and Breadboard

The author(s) of the chapter: Botond Csathó

"Paves the way for electronic circuits" - the tools that give life and seat for the parts are introduced. Components are rarely connected directly to each other, usually using a carrier/board that creates the connections described in our circuit diagrams. In this section, you will learn what a breadboard is and how to use it to assemble the examples in the curriculum. And when a circuit is ready, it is a good idea to try it out, and the laboratory power supply will help you with this. You will also learn about its functions and operation.


05 Multimeter, Ohm’s Law in Practice

The author(s) of the chapter: Péter Nagy

During our adventures in electronics, the multimeter will be one of our best friends, our greatest help in examining our circuits and components. It allows us to measure the physical quantities we have encountered so far only in theory, and to verify the laws of Physics such as the Ohm's Law. In the fifth chapter, we present in detail the functions of multimeters and their use, and examine how our measurement results relate to our expectations from our theoretical knowledge.


06 Linear Power Supplies and Diodes

The author(s) of the chapter: Balázs Ancsa

This chapter covers the basic features of power supplies and the construction of a 5-volt power supply that will be the building block of our future circuits. The second half of this section introduces the diodes, which are the simplest and perhaps most important semiconductor components.


07 Switching Devices

The author(s) of the chapter: Dávid Kulcsár

In order to move on to increasingly complex circuits, we need a variety of switching devices. These help us change the state of our circuitry, creating dynamic, interactive devices. In addition to simple mechanical switches (e.g. light switches), you can immerse yourself in the world of semiconductor switches (BJT, MOSFET) and learn how they work.


08 Astable Circuit

The author(s) of the chapter: Szabolcs Veréb

Building on previous chapters, we will now become familiar with a small but still complex circuit: we will be flashing LED light sources. As a result, we get more into the world of transistors and integrated circuits (ICs) and introduce time-varying systems. We will look more closely at how a transistor can act as a switch, and show how simple timing can be accomplished with simple components.


09 Microcontrollers I.

The author(s) of the chapter: Gergely Lágler , Viktor Vincze

In this chapter we create a foundation for our knowledge about the structure, operation, and programming of microcontrollers which we will heavily rely on from now on. Microcontrollers are immensely complex circuits comprising several million transistors, and yet their inner workings are easily explained today as they are all around us and have become part of our everyday lives. At the end of the chapter we try out a simple program written for a microcontroller for the first time.

You can find the example code for this chapter here


10 IT Basics

The author(s) of the chapter: Olivér Pintér , Gábor Proksa

Before diving in deep into the world of microcontroller programming let’s do a quick review of the basics of programming itself. In this chapter we talk about number systems, logic operations, and introduce the basic building blocks of the C language. You will need this knowledge later! :)


11 Microcontrollers II.

The author(s) of the chapter: János Tóth

Building on the previous two chapters we can begin some serious microcontroller programming with a simple example. At first, we introduce the development environment, and in our example, we even talk about overflow and software timing.

You can find the example code for this chapter here


12 Debugging - Troubleshooting in the Program

The author(s) of the chapter: Dávid Kiss

In this chapter we showcase how to easily find errors in your code. The development environment enables us to step trough our program line-by-line and check the outcome of each statement, and the internal state of the microcontroller. This way we can easily find unexpected, hidden errors.

You can find the example code for this chapter here


13 DC Motors

The author(s) of the chapter: Dániel Csapó

In this chapter we will talk about the underlying physics that make DC motors rotate. While we are at it, we go over the main parts of DC motors as well in detail such as the rotor, the stator, and one of the most important parts: the commutator. Finally, we introduce two other types of motors as well, more commonly found in a typical household.


14 Twilight Switch, Simple Sensors and Comparator

The author(s) of the chapter: Miklós Szilágyi , Erzsébet Szomorú-Ozsváth

In this chapter we review how FET-s work, and introduce the most basic sensors, with the help of which we can convert various physical quantities to electrical signals. With our sensors we build a few controlled analog circuits, such as a twilight switch. In the last section we will see how to compare different signals with simple electrical components, and with a microcontroller.

You can find the example code for this chapter here


15 PWM or Pulse Width Modulation

The author(s) of the chapter: Gábor Baracsi

PWM, or Pulse-Width Modulation can be found in almost all our electronic devices in some form. In this chapter we show how can it be used to adjust the brightness of a light source, or even set the speed of a DC motor.


16 Accurate Timing - Timers

The author(s) of the chapter: László Treszkai

Accurate timing has a huge importance in our daily life. In this chapter you can learn about timers inside microcontrollers, and you can build your own digital clock. Meanwhile you can expand your software knowledge and find some practical advice for designing.

You can find the example code for this chapter here


17 PWM with Microcontroller

The author(s) of the chapter: Endre Szesztay

In this chapter we will learn about how to create a pulse-width modulated signal utilizing our knowledge of PWM and timers from previous chapters. Of course, this will be done through practical examples such as creating a pulsating light, and sounding some familiar tunes.

You can find the example code for this chapter here


18 USB Communication

The author(s) of the chapter: Gábor Kalmár

Today we can hardly imagine our life without USB, or Universal Serial Bus. In this chapter we will see how to communicate between our PC and microcontroller using the USB port. Not only can you learn about the communication on a serial port and the structure of the messages, but we also will show you how you can send text and commands to your device. At the end of the chapter we even make PC controlled light strip.

You can find the example code for this chapter here


19 EEPROM, Non-Volatile Memory

The author(s) of the chapter: Szabolcs Veréb

After quickly summarizing the different types of memories available we dive into the world of EEPROM memories. There are many simple applications where we already need to use non-volatile memories, such as counting steps, or storing a configuration option (e.g. TV volume, channel list). The theory here is interesting by itself, but we added some thought experiments, practical advice, and examples as well.

You can find the example code for this chapter here


20 Voltage Regulators, Current Limiters with Transistors

The author(s) of the chapter: Viktor Vincze

Most electronic circuits need a constant, stable voltage supply for correct operation, and limiting the current is also useful to protect against unexpected external conditions. In this chapter you can see several solutions to both problems, and you can try them out yourselves with example circuits or on your own.


21 Immediate Events in the Software, Interrupts

The author(s) of the chapter: Péter Farkas , Csaba Apró

Interrupts make it possible to react to events immediately, and never miss anything. Unfortunately, it introduces some new problems as well. Through a basic example with a push button we showcase the workings of interrupts and their special properties. In embedded systems you will see a lot of interrupts in the future, so you better be prepared.

You can find the example code for this chapter here


22 Processing Analog Signals, the ADC

The author(s) of the chapter: Erzsébet Szomorú-Ozsváth

Our world we live in is analog by nature, but our programmable circuits are digital. Our sensors can read the analog world and create an analog signal, but our microcontrollers only understand digital signals. To bridge the gap, we use analog-digital converters, or ADC-s. Through easy-to-understand examples we will show what to look out for while such a conversion, and how you can use the ADC peripheral of your microcontroller.

You can find the example code for this chapter here


23 Additional Useful Sensors

The author(s) of the chapter: Tamás Pepó

Sensing is very important in todays automated world, as our machines have to get information about their surroundings somehow and react to them (be it a simple washing machine, or Optimus Prime himself). We have already learned about a few sensors before but that was only the tip of the iceberg. Now, we dig a little deeper, and learn about a ton of new sensors, and their classification. We talk about the most commonly used sensors in robotics, and their variants in detail.


24 Control and Regulation

The author(s) of the chapter: Gergő Herángli , Csaba Apró , Máté Trádler , Barbara Ujvári

This is the final chapter of our curriculum, and you will need all the knowledge from the previous ones. We only talk about control theory a little bit, as that would require more in-depth mathematical knowledge, but we will dive deep into regulation! In the example project we will make a digitally adjustable thermostat. The switching temperature is set via a USB connection, we measure the voltage of an NTC with the ADC of the microcontroller, calculate the temperature, and switch a 12V ventilator on or off trough a FET as necessary.

You can find the example code for this chapter here


25 List of Tools and Components

You can find all the tools and components used in the curriculum in this list.

Oldal tetejére