Raspberry Pi 4 Model B
by Raspberry Pi Ltd. Used in 4 builds listed here.
Where to buy
Specs
| cpu | Broadcom BCM2711, 4x Cortex-A72 |
Variants (pick the right one)
- ram: 4GB, note: TurtleBot 4 and Lite ship with the 4GB
Mistakes to avoid
- Pi 4 prices rose with the 2026 memory shortage too; the 4GB was $120 at Adafruit on 2026-10-25.
- Donkey Car's docs only use the Pi 4 inside the pre-assembled Waveshare PiRacer Pro; the DIY BOM now lists a Pi 5.
Builds that use it
Donkey Car
beginner · $290 to $470
Hobby RC car with a Raspberry Pi and camera on top that learns to drive itself from your own driving data.
TurtleBot 4 Lite (parts build)
beginner · $1,000 to $1,150
ROS 2 teaching robot: an iRobot Create 3 base carrying a Raspberry Pi 4, a 2D lidar and an OAK-D-Lite depth camera.
SpotMicro (SpotMicroAI)
intermediate · $300 to $500
Fully 3D printed hobby robot dog with twelve hobby servos, a Pi or Jetson brain, and a large community of remixes.
Stanford Pupper (v1, servo version)
intermediate · $750 to $1,150
Twelve-servo Raspberry Pi robot dog from Stanford's student club, built from carbon fiber plates and printed hips, driven by a PS4 controller.