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In this video presentation at Euruko 2023, Hitoshi Hasumi introduces viewers to the field of microcontroller programming using Ruby, providing a comprehensive foundation for beginners. He explains the fundamental function of microcontrollers, particularly focusing on the Raspberry Pi Pico and its capabilities. The session is structured into four main parts, making it easy for attendees to grasp the concepts.

Key points covered include:  
- **Introduction to Microcontrollers**: Microcontrollers serve as the core components in various electronic devices, and the Raspberry Pi Pico is highlighted as an ideal starting point. It's powered by the RP2040 microcontroller, which runs bare metal, meaning it doesn't require an operating system.  
- **Initial Setup**: Users are guided through downloading the necessary firmware (RP2040 UF2 file) and connecting the Pico to a computer, emphasizing the use of terminal emulators like GTKTerm or Tera Term for interfacing.  
- **Basic Commands and GPIO Usage**: Hasumi introduces General-Purpose Input/Output (GPIO), explaining its importance in digital operations. He demonstrates how to control an onboard LED using GPIO, showing commands for turning it on and off, and provides an analogy for understanding current flow using Ohm's law.  
- **Analog-to-Digital Converters (ADC)**: The ADC functionality is explained, particularly for reading analog values such as temperature, illustrating the connection between theory and application through a thermistor example.  
- **Advanced Applications**: The presentation discusses advanced uses of P Ruby, including the creation of Ruby scripts for automating processes on startup and various peripheral integrations. Hasumi also touches on communication protocols like SPI and I2C used in microcontroller projects.  
- **Encouragement for Exploration**: Hasumi concludes by inviting the audience to explore the potential of microcontroller programming with P Ruby, highlighting ongoing developments and projects available for further learning.

In summary, this presentation offers a thorough introduction for beginners interested in programming microcontrollers with Ruby, covering essential concepts, practical demonstrations, and encouraging exploration of advanced applications in the field. Key takeaways include the importance of GPIO and ADC, as well as the numerous possibilities with microcontroller programming using Ruby.

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