Raspberry PI 4 Model B

The Raspberry Pi 4 Model B is a credit-card sized single-board computer designed for hobbyists, educators, and developers.

It can handle tasks like:

Desktop computing (web browsing, office apps)

Media center (4K video)

IoT and robotics

Servers, gateways, or network devices

Programming and electronics projects

It’s a massively upgraded version of the previous Pi models with:

Quad-core CPU

Up to 8 GB RAM

Dual 4K display support

USB 3.0 for fast peripherals

✨ Key Features

✅ Broadcom BCM2711 Quad-core Cortex-A72 (ARM v8) 64-bit SoC @ 1.5 GHz
✅ RAM options: 2 GB, 4 GB, or 8 GB LPDDR4
✅ Dual micro HDMI ports (supports 4Kp60)
✅ 2× USB 3.0 + 2× USB 2.0 ports
✅ Gigabit Ethernet
✅ Wireless: 802.11ac Wi-Fi + Bluetooth 5.0
✅ 40-pin GPIO header (fully backward-compatible)
✅ MicroSD slot for OS/storage
✅ USB-C power input (5 V, 3 A recommended)

📊 Electrical Specifications
Parameter Value
CPU Quad-core Cortex-A72 64-bit, 1.5 GHz
GPU VideoCore VI, supports OpenGL ES 3.0
RAM 2/4/8 GB LPDDR4
Storage MicroSD slot (UHS-I supported)
USB 2× USB 3.0, 2× USB 2.0
Ethernet Gigabit (max ~300 Mbps actual throughput)
Wireless Wi-Fi 802.11 b/g/n/ac, Bluetooth 5.0
Video output 2× micro HDMI, up to 4Kp60
GPIO 40 pins, digital I/O, SPI, I²C, UART, PWM
Power 5 V DC via USB-C, ~3 A
Dimensions 88 mm × 58 mm × 19.5 mm
Operating temp 0 °C – 50 °C
🔌 Ports and Pinout

Ports:

2× micro HDMI → dual display 4K

2× USB 3.0 → fast peripherals (external drives, cameras)

2× USB 2.0 → general use

1× Gigabit Ethernet

1× USB-C power input

1× 3.5 mm audio + composite

1× MicroSD card slot

GPIO (40-pin):

General purpose digital I/O

Supports: SPI, I²C, UART, PWM, 1-wire, etc.

Compatible with previous Pi hats and accessories

⚙️ How It Works

MicroSD card holds the OS (Raspberry Pi OS, Ubuntu, etc.)

Connect peripherals: keyboard, mouse, display, network

Power via USB-C, CPU boots the OS

GPIO pins allow microcontroller-like control for sensors, relays, OLEDs, etc.

Supports Python, C/C++, Node.js, and many libraries for electronics and IoT

🛠️ Common Applications

Desktop PC / Media center / Gaming emulator

IoT gateway or hub

Robotics and automation

Home assistant servers

Sensor monitoring and dashboards

AI and machine learning at the edge (with 8 GB RAM version)

💡 Design Tips
✅ Power supply

Use 5 V, 3 A USB-C for stability, especially with USB 3.0 peripherals.

✅ Cooling

High CPU load → consider heat sinks or small fans.

✅ OS

Use Raspberry Pi OS or Ubuntu; microSD cards ≥16 GB recommended.

✅ GPIO projects

Supports I²C, SPI, UART, PWM → perfect for connecting sensors, OLEDs, GSM modules, etc.

✅ Display

Dual 4K support → can drive high-res GUI dashboards.

✅ Quick Summary

Raspberry Pi 4 Model B = tiny, powerful single-board computer

Perfect when you want:
✔ Full desktop or media computer in small form factor
✔ Connect sensors, displays, and modules via GPIO
✔ Wi-Fi + Bluetooth for IoT projects
✔ Dual 4K displays for dashboards or media