Raspberry Pi 4 Model B (4GB RAM)
Overview
The Raspberry Pi 4 Model B is a single-board computer (SBC) designed for IoT, robotics, and other embedded system applications. It is the fourth generation of the Raspberry Pi series, offering significant upgrades and improvements over its predecessors. This model comes with 4GB of RAM, providing a balance between performance and cost.
Key Features
### Processing
Broadcom BCM2711B0 quad-core Cortex-A72 (ARMv8) 64-bit SoC @ 1.5GHz
64-bit
ARMv8-A
512KB L2 cache
### Memory and Storage
4GB LPDDR4-2400 SDRAM
MicroSD card slot (supports up to 1TB)
MicroSD card
### Graphics and Display
Broadcom VideoCore VI
2x HDMI 2.0 (4K @ 60Hz)
Up to 4K (3840 x 2160) @ 60Hz
H.265 10-bit 4K60 decode, H.264 10-bit 4K30 decode
### Networking and Connectivity
Gigabit Ethernet (RJ45)
| Wi-Fi | Dual-band 802.11b/g/n/ac wireless LAN |
Bluetooth 5.0
2x USB 3.0, 2x USB 2.0
GPIO, I2C, I2S, SPI, UART
### Power and Performance
5V, 3A recommended power supply
Integrated power management IC (PMIC) for efficient power supply
0C to 50C
### Security
Supported
Not available
AES, SHA-2, and RSA acceleration
### Operating System
Raspberry Pi OS (based on Linux)
Raspberry Pi OS, Ubuntu, Windows 10 IoT Enterprise, and other Linux distributions
### Mechanical and Environmental
85mm x 56mm x 17mm
46g
FR4 (Flame Retardant 4) PCB
10% to 90% RH (non-condensing)
### Other Features
15-pin CSI camera interface
15-pin DSI display interface
40-pin GPIO header with multiple interfaces (UART, I2C, I2S, SPI, etc.)
Functionality
| The Raspberry Pi 4 Model B (4GB RAM) is a versatile single-board computer designed for a wide range of applications, including |
IoT projects (home automation, industrial automation, etc.)
Robotics and robotic systems
Media centers and media players
Retro gaming consoles
Learning and education (programming, electronics, etc.)
Prototyping and proof-of-concept development
The Raspberry Pi 4 Model B offers advanced features, improved performance, and expanded capabilities compared to its predecessors, making it an ideal choice for demanding IoT and embedded system applications.
Raspberry Pi 4 Model B (4GB RAM) DocumentationOverviewThe Raspberry Pi 4 Model B is a single-board computer developed by the Raspberry Pi Foundation. It is a powerful, compact, and highly affordable device that can be used for a wide range of applications, from DIY projects to industrial automation. The 4GB RAM variant provides a significant performance boost, making it suitable for more demanding tasks.Technical SpecificationsCPU: Broadcom BCM2711B0 quad-core Cortex-A72 (ARMv8) 64-bit SoC
RAM: 4GB LPDDR4-2400 SDRAM
Storage: MicroSD card slot (supports up to 1TB)
Operating System: Raspberry Pi OS (based on Linux)
Networking: Dual-band 802.11ac wireless LAN, Bluetooth 5.0, Gigabit Ethernet, and 2 USB 3.0 ports
GPIO: 40-pin GPIO header with 26 GPIO pins, 2 I2C, 2 SPI, and 1 UARTCode Examples### Example 1: Simple Python Script to Control an LED using GPIOIn this example, we will use the Raspberry Pi's GPIO pins to control an LED. We will create a Python script that blinks an LED connected to pin 17.Hardware RequirementsRaspberry Pi 4 Model B (4GB RAM)
LED
1k resistor
Breadboard
Jumper wiresSoftware RequirementsRaspberry Pi OS (latest version)
Python 3.x (pre-installed)Code
```python
import RPi.GPIO as GPIO
import time# Set up GPIO mode
GPIO.setmode(GPIO.BCM)# Set up GPIO pin 17 as an output
GPIO.setup(17, GPIO.OUT)try:
while True:
# Turn on the LED
GPIO.output(17, GPIO.HIGH)
time.sleep(1)
# Turn off the LED
GPIO.output(17, GPIO.LOW)
time.sleep(1)except KeyboardInterrupt:
# Clean up GPIO on exit
GPIO.cleanup()
```
ExplanationIn this example, we import the RPi.GPIO library, which provides a Python interface to the Raspberry Pi's GPIO pins. We set up pin 17 as an output, then use a while loop to toggle the LED on and off using the `GPIO.output()` function. The `time.sleep()` function is used to introduce a delay between each toggle.### Example 2: Web Server using Flask to Control a Relay ModuleIn this example, we will create a web server using Flask to control a relay module connected to the Raspberry Pi's GPIO pins.Hardware RequirementsRaspberry Pi 4 Model B (4GB RAM)
Relay module (e.g., SRD-05VDC-SL-C)
Breadboard
Jumper wiresSoftware RequirementsRaspberry Pi OS (latest version)
Python 3.x (pre-installed)
Flask (install using `pip install flask`)Code
```python
from flask import Flask, request
import RPi.GPIO as GPIOapp = Flask(__name__)# Set up GPIO mode
GPIO.setmode(GPIO.BCM)# Set up GPIO pin 18 as an output for the relay module
GPIO.setup(18, GPIO.OUT)@app.route('/relay', methods=['POST'])
def relay_control():
state = request.form['state']
if state == 'on':
GPIO.output(18, GPIO.HIGH)
elif state == 'off':
GPIO.output(18, GPIO.LOW)
return 'Relay set to ' + stateif __name__ == '__main__':
app.run(debug=True, host='0.0.0.0')
```
ExplanationIn this example, we create a Flask web server that listens for POST requests to the `/relay` endpoint. The request body contains the state of the relay (either 'on' or 'off'). We use the `GPIO.output()` function to set the relay state accordingly.To test this example, open a web browser and navigate to `http://raspberrypi_IP_address:5000/relay` (replace `raspberrypi_IP_address` with your Raspberry Pi's IP address). Use a tool like `curl` or a POST request tool to send a POST request with the `state` parameter set to 'on' or 'off'.Additional ResourcesFor more information on using the Raspberry Pi 4 Model B (4GB RAM) and its GPIO pins, refer to the official Raspberry Pi documentation and resources:Official Raspberry Pi Documentation: <https://www.raspberrypi.org/documentation/>
Raspberry Pi GPIO Library: <https://gpiozero.readthedocs.io/en/stable/>
Flask Web Framework: <https://flask.palletsprojects.com/>