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+---
+title: Raspberry Pi!
+sidebar:
+ attrs:
+ class: pi
+---
+
+The Raspberry Pi is an affordable, yet surprisingly powerful, "pocket-sized" computer designed to help you explore coding, electronics, and digital systems.
+
+
+
+
+Despite its small size, the Raspberry Pi is a **fully functional computer** capable of running a Linux-based operating system, such as Raspberry Pi OS (a variant of Debian). This means you get the full experience of coding with a Unix system, combined with the fun of interacting with physical hardware components such as LEDs, buttons, joystick modules and more!
+
+:::note
+
+The Raspberry Pi is not required to learn the coding concepts covered in this book, but with it, you'll get some unique learning opportunities:
+
+- **Hands-On Fun:** You get to see the results of your code come alive — lighting up LEDs, moving motors, or even playing sounds!
+- **Explore Embedded Systems:** Discover how code interacts with real-life gadgets and electronics and gain more understanding of how software and hardware can work together.
+- **Creative Exploration:** Tinker with sensors, buttons, and displays to create fun projects such as controlling the LEDs on a 7-segment display using inputs from a sensor or your code commands.
+- **Easy to Start:** Even if you’re new to programming, the Raspberry Pi offers a gentle introduction with plenty of support when you get stuck.
+
+:::
+
+:::tip[Official Documentation]
+
+The official **[Raspberry Pi Documentation](https://www.raspberrypi.com/documentation/)** includes a variety of useful guides, such as setting up your Raspberry Pi, configuring settings, accessing your Pi remotely, and much more.
+
+:::
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diff --git a/src/content/docs/book/part-0-getting-started/2-computer-use/1-tour/3-2-setup-raspberry.md b/src/content/docs/book/part-0-getting-started/2-computer-use/1-tour/3-2-setup-raspberry.md
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+---
+title: Use Your Raspberry Pi
+sidebar:
+ attrs:
+ class: pi
+---
+
+Inside the [Raspberry Pi](/book/part-0-getting-started/2-computer-use/0-panorama/05-raspberry-pi), it has a CPU (the brain), RAM (its short-term memory), and various ports like HDMI and USB.
+
+But the real magic happens with its GPIO pins!
+
+## Understanding the GPIO Pins
+
+
+
+
+The **General Purpose Input/Output (GPIO)** pins give you a physical interface between your Raspberry Pi and external hardware components. Here’s how you can use them:
+
+- **Input Mode:**
+ You can attach sensors (temperature and light sensors) or other input devices such as a joystick, to the pins to allow the Raspberry Pi to read signals from these sensors to understand its environment, or control a player in a game.
+
+- **Output Mode:**
+ Connect LEDs, motors, buzzers, and more! With a bit of code, you can make an LED blink, a motor spin, or even create sound effects.
+
+- **Digital and PWM Signals:**
+ Some pins work in a digital on/off mode (perfect for simple tasks), while others support Pulse Width Modulation (PWM), which lets you control the speed of a motor or the brightness of an LED by varying the power output.
+
+With the GPIO pins as your bridge between software and hardware, you can build exciting programs that respond to real-world events!
+
+
+
+
+:::note[Getting Started: Set up Your Raspberry Pi]
+
+Before you start exploring the Raspberry Pi activities in this book, you will need to get your Raspberry Pi up and running. We have step-by-step guides for this:
+
+- [Set up my Raspberry Pi](/book/appendix/0-installation/2-3-setup-pi/)
+
+ This page includes instructions for setting up the Raspberry Pi OS (including downloading the OS, installing it on your microSD card, and initial configuration) as well as installing the software tools you will need.
+
+ *You can skip to [3. Set up Raspberry Pi OS](/book/appendix/0-installation/2-3-setup-pi/#3-setup-raspberry-pi-os) if you have already done the initial OS installation.*
+
+- [Build my Raspberry Pi](/book/appendix/0-installation/2-2-pi-computer)
+
+ This page includes information about the Raspberry Pi hardware as well as optional instructions to help you build a small portable setup.
+
+:::
+
+:::tip
+
+*Take your time during setup* and don’t be afraid to explore! Every step (or misstep) is a learning opportunity that will build up your skills and understanding.
+
+:::
diff --git a/src/content/docs/book/part-0-getting-started/3-building-programs/1-tour/4-led-blink.mdx b/src/content/docs/book/part-0-getting-started/3-building-programs/1-tour/4-led-blink.mdx
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+---
+title: Hello LED Blinking
+sidebar:
+ attrs:
+ class: pi
+---
+
+import { Accordion, AccordionItem } from 'accessible-astro-components'
+import { Steps } from "@astrojs/starlight/components";
+
+Welcome to our fun, step-by-step guide on how to blink a physical LED using SplashKit on your Raspberry Pi! In this tutorial, you'll learn how to set up your hardware, write simple code to turn your LED on and off multiple times, as well as how to run your project. Get ready to see your LED come to life!
+
+## Hardware Setup
+
+### Components
+
+To build the simple LED circuit shown below (in real life), here's what you need:
+
+- **LED:** Can be any color.
+ *Remember: the longer leg is the anode (+), the shorter is the cathode (-).*
+- **220 Ω Resistor:** This protects the LED by limiting the current.
+- **Breadboard and Jumper Wires:** For making temporary connections.
+- **Raspberry Pi:** With a GPIO pin (we'll use GPIO Pin 11) and a Ground (GND) pin.
+
+:::note[Just getting started with circuits?]
+
+These sections include links with more information about the circuit components:
+
+
+LEDs and Resistors:
+
+- [LEDs (Introduction to Raspberry Pi Pico guide)](https://projects.raspberrypi.org/en/projects/introduction-to-the-pico/7)
+- [Resistors (Introduction to Raspberry Pi Pico guide)](https://projects.raspberrypi.org/en/projects/introduction-to-the-pico/6)
+- [Resistors for LED Circuits](https://eepower.com/resistor-guide/resistor-applications/resistor-for-led/)
+
+
+
+Breadboards and Jumper Wires:
+
+- [How to Use a Breadboard for Electronics and Circuits](https://www.sciencebuddies.org/science-fair-projects/references/how-to-use-a-breadboard)
+ - [What is inside a breadboard?](https://www.sciencebuddies.org/science-fair-projects/references/how-to-use-a-breadboard#inside-breadboard)
+ - [How are the holes connected?](https://www.sciencebuddies.org/science-fair-projects/references/how-to-use-a-breadboard#holes)
+ - [What is a breadboard diagram?](https://www.sciencebuddies.org/science-fair-projects/references/how-to-use-a-breadboard#breadboard-diagram)
+- [What are jumper wires and what kind should I use?](https://www.sciencebuddies.org/science-fair-projects/references/how-to-use-a-breadboard#jumper-wires)
+
+
+:::
+
+### Wiring Instructions
+
+
+
+
+
+
+1. **Put the LED and resistor onto the breadboard:**
+
+ Place the resistor across the center channel of the breadboard, or across any two separate rows.
+
+ Then place the LED across two rows (as shown in the breadboard diagram above), with the cathode (short leg) on the same row as one end of the resistor.
+
+2. **Attach the ground wire:**
+
+ Attach a jumper wire from the other end of the resistor to a GND pin.
+ *(This is the black wire connected to pin 6 in the diagram above.)*
+
+3. **Connect the LED to the GPIO Pin:**
+
+ Attach a jumper wire from the LED’s anode (long leg) to GPIO Pin 11.
+ *(This is the blue wire connected to pin 11 in the diagram above.)*
+
+
+
+:::caution[Safety Note:]
+Always double-check your connections and ground yourself before handling the circuit to avoid static discharge or accidental damage.
+:::
+
+## Software Setup
+
+To set up the software side of this project, you can follow the steps below:
+
+
+
+1. ### Create a new C# project
+
+ Open your terminal and create a new C# console project:
+
+ ```shell
+ mkdir LedBlink
+ cd LedBlink
+ dotnet new console
+ dotnet add package SplashKit
+ code .
+ ```
+
+2. ### Write the code
+
+ Copy the code below, then replace the contents of your `Program.cs` file with this code:
+
+ ```csharp
+ using SplashKitSDK;
+ using static SplashKitSDK.SplashKit;
+
+ // Initialise the GPIO system
+ RaspiInit();
+
+ // Define the LED pin (using physical Pin 11)
+ GpioPin ledPin = GpioPin.Pin11;
+
+ // Set the LED pin to output mode
+ RaspiSetMode(ledPin, GpioPinMode.GpioOutput);
+
+ // Blink 1: Turn LED ON, wait, then OFF
+ RaspiWrite(ledPin, GpioPinValue.GpioHigh);
+ Delay(500); // LED ON for 500 ms
+ RaspiWrite(ledPin, GpioPinValue.GpioLow);
+ Delay(500); // LED OFF for 500 ms
+
+ // Blink 2: Turn LED ON, wait, then OFF
+ RaspiWrite(ledPin, GpioPinValue.GpioHigh);
+ Delay(500);
+ RaspiWrite(ledPin, GpioPinValue.GpioLow);
+ Delay(500);
+
+ // Blink 3: Turn LED ON, wait, then OFF
+ RaspiWrite(ledPin, GpioPinValue.GpioHigh);
+ Delay(500);
+ RaspiWrite(ledPin, GpioPinValue.GpioLow);
+ Delay(500);
+
+ // Clean up the GPIO system
+ RaspiCleanup();
+ ```
+
+ :::note
+ You will learn more about SplashKit's Raspberry Pi code in Part 1, but for now you can just copy/paste this code without needing to know the details just yet.
+ :::
+
+3. ### Start the "pigpiod" Daemon
+
+ Underneath SplashKit we use the [Pigpio library](https://abyz.me.uk/rpi/pigpio), specifically its
+ daemon. To interface with this daemon, it must be running.
+
+ :::tip[Daemons]
+ A daemon is a background process that runs continuously, waiting for requests to
+ perform some action. In this case, the daemon is waiting for requests to change the state of the
+ GPIO pins. This allows us to run multiple programs that interact with the GPIO pins.
+ :::
+
+ To start the `pigpiod` daemon, run the following command:
+
+ ```shell
+ sudo pigpiod
+ ```
+
+ To stop the daemon from running, you can use the command:
+
+ ```shell
+ sudo killall pigpiod
+ ```
+
+ :::note[Pigpiod Error Message]
+
+ If the `pigpiod` daemon is not running, you will the following error message in your terminal:
+
+ ```shell
+ ERROR [default] Pigpio error: bad connect.
+ ```
+
+ :::
+
+4. ### Build and run the project
+
+ Use the following command to build and run the program:
+
+ ```shell
+ dotnet run
+ ```
+
+
+
+## Expected Outcome
+
+When you run the program, your physical LED connected to GPIO Pin 11 should blink on and off three times. Each "on" state lasts for 500 milliseconds followed by an "off" state for 500 milliseconds. Once the sequence is complete, the program cleans up the GPIO settings and exits.
+
+
+
+Enjoy watching your LED blink and have fun tinkering with your Raspberry Pi projects!
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