The Raspberry Pi 4 Model B 4GB Ram Board is a small, low-cost computer that is ideal for various DIY projects and basic computer needs. It is equipped with 4GB RAM, a Broadcom BCM2711, Cortex-A72 (ARM v8) 64-bit SoC @ 1.5GHz, Gigabit Ethernet, Dual-Band 802.11ac wireless, Bluetooth 5.0, BLE, and two USB 3.0 ports. It supports multiple operating systems and is suitable for a range of applications such as media centers, game consoles, and educational use.

Package Includes:

• 1 x Raspberry Pi 4 Model B 4GB Ram Board

Features:

• Processor: Broadcom BCM2711, Cortex-A72 (ARM v8) 64-bit SoC @ 1.5GHz. This powerful processor provides enough computational power for various tasks and applications.
• Memory: 4GB LPDDR4-3200 SDRAM, providing a smooth and responsive user experience.
• Ethernet: Gigabit Ethernet port, providing fast and reliable wired network connectivity.
• Wireless Connectivity: Dual-Band 802.11ac wireless and Bluetooth 5.0, BLE, providing fast and reliable wireless connectivity options.
• USB Ports: Two USB 3.0 ports and two USB 2.0 ports, provide a range of connectivity options for keyboards, mice, and other devices.
• Display Port: Optional 2-lane MIPI DSI/CSI display port for connecting a touch screen display, supporting dual monitor displays with resolutions up to 4K.
• GPIO Header: 40-pin GPIO header for connecting a range of sensors and devices, making it suitable for DIY projects and physical computing applications.
• Storage: MicroSD card slot for loading your operating system and storing data, with support for cards up to 128GB.
• Operating System Support: The Raspberry Pi 4 Model B supports multiple operating systems, including Raspberry Pi OS, Ubuntu, and others, making it a flexible platform for various use cases.

Description:

The Raspberry Pi 4 Model B 4GB Ram Board is a credit card-sized single-board computer that is designed to promote the teaching of basic computer science in schools and developing countries. This powerful and versatile computer is equipped with a Broadcom BCM2711, Cortex-A72 (ARM v8) 64-bit SoC @ 1.5GHz, 4GB LPDDR4-3200 SDRAM, Gigabit Ethernet, dual-band 802.11ac wireless, Bluetooth 5.0, BLE, two USB 3.0 ports, two USB 2.0 ports, and an optional 2-lane MIPI DSI/CSI display port for connecting a touch screen display. Additionally, it has a 40-pin GPIO header for connecting a range of sensors and devices, a microSD card slot for loading your operating system and storing data. It supports dual monitor displays with resolutions up to 4K. This makes it a suitable platform for a wide range of applications, from software development and media center use to gaming and educational use.

Principle of Work:

The Raspberry Pi 4 Model B 4GB Ram Board is a single-board computer that works by executing software programs stored in its memory. The device has a central processing unit (CPU), which is responsible for executing instructions and performing calculations. The CPU is connected to the memory (RAM) that stores data and programs that the CPU can access. The Raspberry Pi 4 Model B has various input/output (I/O) ports and connectors, such as USB ports, Ethernet ports, display ports, and GPIO header, which allow it to interact with external devices and peripherals. The device is powered by an external power supply and runs on an operating system, such as Raspberry Pi OS, that is stored on a microSD card.

When the Raspberry Pi 4 Model B is powered on, the operating system is loaded into memory and executed by the CPU. This allows the device to run software applications and interact with connected devices and peripherals. The Raspberry Pi 4 Model B supports a range of programming languages, including Python, Scratch, and others, making it an ideal platform for learning to code and developing software projects.

In summary, the Raspberry Pi 4 Model B 4GB Ram Board works by executing software programs stored in its memory, through its CPU, and interacts with the world through its various I/O ports and connectors.

Pinout of the Module:

• 3.3V Power: These pins provide a 3.3V power supply and are not capable of providing a large amount of current.
• 5V Power: These pins provide a 5V power supply and can provide up to 3A of current.
• Ground: There are several ground pins on the GPIO header, which are used as a common reference point for other signals.
• GPIO (General Purpose Input/Output): The GPIO pins are digital inputs and outputs that can be used for a variety of purposes, such as reading buttons, controlling LEDs, and communicating with other devices.
• UART (Serial Communication): These pins allow for serial communication with other devices, such as GPS units or other microcontrollers.
• I2C (Inter-Integrated Circuit): These pins allow for communication with I2C devices, such as temperature sensors and accelerometers.
• SPI (Serial Peripheral Interface): These pins allow for communication with SPI devices, such as OLED displays and shift registers.
• PWM (Pulse Width Modulation): These pins allow for generating pulses of varying lengths, which can be used to control the brightness of LEDs or the speed of motors.
• I2S (Inter-IC Sound): These pins allow for high-quality audio output.
• PCM (Pulse-Code Modulation): These pins allow for audio input and output.

Applications: 

• Media Centers: The Raspberry Pi 4 Model B can be used as a media center for playing music, videos, and photos on a TV or monitor, using software such as Kodi or Plex.
• Retro Gaming: The Raspberry Pi 4 Model B can be used to play classic video games from consoles such as the Nintendo Entertainment System, using software such as RetroPie.
• Home Automation: The Raspberry Pi 4 Model B can be used to control and monitor various aspects of a smart home, such as lighting, temperature, and security, using software such as Home Assistant.
• Web Servers: The Raspberry Pi 4 Model B can be used as a web server, hosting websites and web applications, using software such as Apache or Nginx.
• File Servers: The Raspberry Pi 4 Model B can be used as a file server, storing and serving files to other devices on a network, using software such as Samba or NFS.
• Robotics: The Raspberry Pi 4 Model B can be used to control robots, such as remote-controlled cars and drones, using software such as ROS (Robot Operating System).
• Internet of Things (IoT) Devices: The Raspberry Pi 4 Model B can be used to create various IoT devices, such as smart switches and sensors, using software such as Node-RED.

Circuit:

To Blink an LED with the Raspberry Pi 4 Model B on pin 17 (GPIO17), you will need the following components:

• LED
• 220Ω resistor
• Jumper wires

Here are the steps to connect an LED to the Raspberry Pi 4 Model B on pin 17:

1. Identify the positive and negative legs of the LED. The positive leg is usually the longer one and is referred to as the anode. The negative leg is usually the shorter one and is referred to as the cathode.
2. Connect one end of the 220Ω resistor to the positive leg (anode) of the LED.
3. Connect the other end of the resistor to the GPIO17 (pin 17) of the Raspberry Pi 4 Model B.
4. Connect the negative leg (cathode) of the LED to the ground (GND) pin on the Raspberry Pi 4 Model B.
5. Connect the Raspberry Pi 4 Model B to a power source, such as a wall adapter or battery.

Once the LED is connected, you can write a program in a language such as Python to control the LED. For example, you can write a program to turn the LED on and off, or to make it blink.

Library:

the first time you use your RPi you will need to Install Raspberry Pi OS (formerly Raspbian) on the Raspberry Pi 4 Model B is a simple process and can be done in a few steps. Here is a guide to installing Raspberry Pi OS on the Raspberry Pi 4 Model B:

1. Download the Raspberry Pi OS image from the official Raspberry Pi website (https://www.raspberrypi.org/downloads/raspberry-pi-os/).
2. Use a program such as Etcher to flash the Raspberry Pi OS image to a microSD card. The microSD card should be at least 8GB in size.
3. Insert the microSD card into the Raspberry Pi 4 Model B, and connect the device to a monitor, keyboard, and mouse.
4. Connect the Raspberry Pi 4 Model B to a power source, such as a wall adapter or battery. The device should now boot into the Raspberry Pi OS setup wizard.
5. Follow the on-screen prompts to set up the Raspberry Pi OS, including setting up the language, keyboard, password, and network settings.
6. After the setup is complete, the Raspberry Pi 4 Model B will boot into the Raspberry Pi OS desktop environment, where you can start using the device and installing additional software as needed.

Python is pre-installed on the Raspberry Pi 4 Model B operating system (Raspberry Pi OS). The device comes with both Python 2 and Python 3 pre-installed, which can be used to write scripts and programs, control hardware, and perform various other tasks.

In addition to the standard libraries that come with Python, the Raspberry Pi also includes the RPi.GPIO library, which provides a way to control the GPIO pins on the device. This library can be used to interact with hardware connected to the Raspberry Pi, such as LEDs, sensors, and motors, making it possible to build a wide range of projects with the device.

Code:  

1. Open the Python 3 terminal on the Raspberry Pi 4 Model B by clicking on the terminal icon on the desktop or by using the command line interface (CLI).
2. Type the following code into the terminal to control the GPIO pin:

import RPi.GPIO as GPIO
import time
GPIO.setmode(GPIO.BCM)
GPIO.setup(17, GPIO.OUT)
while True:
 GPIO.output(17, GPIO.HIGH)
 time.sleep(1)
 GPIO.output(17, GPIO.LOW)
 time.sleep(1)

1. Press Enter to run the code. The LED connected to GPIO pin 17 should now start blinking on and off.
2. To stop the code, press Ctrl + C on the keyboard.

This code uses the RPi.GPIO module, which is included with the Raspberry Pi OS and provides a way to control the GPIO pins. The code sets up GPIO pin 17 as an output, and then repeatedly turns the pin on and off, with a delay of 1 second in between each change. The time.sleep the function is used to pause the program for a specified amount of time.

Note: Make sure that the LED is connected to GPIO pin 17, as specified in the code, and that the GPIO pin is set up as an output using GPIO.setup. Also, make sure to use a current-limiting resistor, such as a 220Ω resistor, when connecting the LED to the GPIO pin to protect the Raspberry Pi from damage.

Technical Details:

• CPU: Broadcom BCM2711, Quad-core Cortex-A72 (ARM v8) 64-bit SoC @ 1.5GHz
• RAM: 4GB LPDDR4-3200 SDRAM (4GB version)
• Connectivity: Gigabit Ethernet, 2.4 GHz and 5.0 GHz IEEE 802.11ac wireless, Bluetooth 5.0, BLE, 2 USB 3.0 ports, 2 USB 2.0 ports, 2 micro-HDMI ports (up to 4kp60 supported), 3.5 mm headphone jack, 40-pin GPIO header
• Storage: microSD card slot for loading operating system and data storage
• Video & Sound: 2 micro-HDMI ports (up to 4kp60 supported), 3.5 mm headphone jack, Dual-monitor support, VideoCore VI graphics, supports OpenGL ES 3.x
• Power: 5V DC via USB-C connector (minimum 3A*), 5V DC via GPIO header (minimum 3A*), Power-over-Ethernet (PoE) enabled (requires separate PoE HAT)
• Dimensions: 88 x 58 x 19.5 mm
• Operating Temperature: 0 – 50°C ambient temperature

Resources:

• Tutorial

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