🍓 Raspberry Pi

Definition

Raspberry Pi, about

Raspberry Pi makes inexpensive, small computers for home, industry, education and much more.

Reading: it makes small, low-cost computers that fit homes, industry and education alike.
Also written: Raspberry Pi; 라즈베리파이

I bought it for Linux development, Kubernetes practice, IoT and edge AI.
I serve it on a public domain, and use it to verify my own technical skills and to prove out ideas.
To me, a Raspberry Pi is a small, split-up mini computer. I chose it because GPIO makes hardware expansion easy, there is plenty of material online, and it was cheap at the time. I have not done IoT with it myself; I use it as an ARM64 Linux machine.
What I miss is CPU speed. I felt it in build times and container virtualization, so I rebuilt the cluster as v2 when I bought the Pi 5.
No expansion boards: just microSD cards and USB disks.

I use them as cluster nodes. The setup is on the Cluster page.
I served small models with Ollama. I ran a 1B LLM and an embedding model and built a pipeline on them.
Frontier models are very capable, so I have reorganized the workloads around agent harnesses. That is on the Cluster page.

The model in the figure above. Its official tagline is "Your tiny, dual-display, desktop computer".

Item	Detail
SoC	Broadcom BCM2711, quad-core Cortex-A72 (64-bit ARM)
Memory	LPDDR4, 1 to 8 GB depending on the model
Video	2 micro-HDMI ports, MIPI DSI, MIPI CSI
Connectivity	2 USB 3.0, 2 USB 2.0, Gigabit Ethernet, Wi-Fi, Bluetooth
Power	USB-C, 5 V
Storage	microSD
Size	85 × 56 mm
Expansion	40-pin GPIO header

A 40-pin header (2 × 20, 2.54 mm pitch) on one edge of the board connects it to external circuits.

Odd pins sit on the inner row and even pins on the outer row. Pin 1 is at the microSD end.
Pins are 3.3 V power, 5 V power, ground, or GPIO.
Each GPIO pin can also take an alternate function such as I2C, SPI, UART or PWM.

Warning

GPIO is 3.3 V logic. Wiring a 5 V signal straight to a GPIO pin can damage the board.