Raspberry Pi 4 Model B (4 GB)
by Raspberry Pi
SKU: PSA-CMP-RPI4-4G
No reviews yetTypical India street price
₹4,500–₹7,500
Full Linux computer on a credit card — Python, OpenCV, classroom servers.
Interface: GPIO, HDMI, USB, CSI, I2C, SPI, UART
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Concept
A single-board computer (SBC): ARM CPU + RAM + GPU running Raspberry Pi OS, not a tiny MCU sketch loop.
A little theory
Broadcom BCM2711 quad Cortex-A72. GPIO is 3.3 V only. CSI camera uses a dedicated MIPI bus. In the classroom, treat Raspberry Pi 4 Model B (4 GB) as a intermediate part using GPIO, HDMI, USB, CSI, I2C, SPI, UART. Typical India street price is about ₹4500–₹7500. Always verify voltage and pin labels on your exact module — silk screens vary across clones. Start with a datasheet or trusted learn guide, power the part correctly, share GND with the MCU, and test with a simple blink/read sketch before building the full project. Measure voltages with a multimeter when something fails, and keep actuator current off the MCU regulator.
How it works in a project
Flash Pi OS to microSD, boot, then use GPIO via gpiozero/pigpio or run Node/Python servers.
Classroom & project use
- Vision labs
- School kiosk
- Home automation hub
- Code Club Linux
Buying in India
Precautions
- Never 5 V into GPIO
- Heat sink / fan for sustained CPU
- ESD on CSI connector
Specifications
| RAM | 4 GB |
| SoC | BCM2711 |
| Logic | 3.3V GPIO |
| Category | Microcontrollers |
| Difficulty | Intermediate |
| Voltage | 5V USB-C ≥3 A |
| Interface | GPIO, HDMI, USB, CSI, I2C, SPI, UART |
Pinout
VCC | GND | SCL | SDA (confirm address with I2C scanner)
