Community Knowledge Base
Compiled from the Modular Robotics community forum. Covers common errors, OS compatibility, hardware tips, and advanced setups. BrickPi3-specific; posts before 2019 and BrickPi/BrickPi+ content excluded.
Contents
As of February 2026, official support is now on Raspberry Pi OS Trixie (Debian 13). A pre-built image is available:
brickpi / password: robots1234For older setups, Legacy Raspberry Pi OS (Buster / Debian 10) 32-bit is still a reliable fallback and can be downloaded via Raspberry Pi Imager under the "Legacy" option.
install_trixie.sh on those releases as well.
The old curl -kL dexterindustries.com/update_brickpi3 | bash script (legacy Buster method) does not work on Bullseye or Bookworm. If you previously tried that and it failed, switch to the pip install method instead.
R4R (Stretch) is the legacy "all-inclusive" image with BrickPi3 software pre-installed. It is no longer maintained (now ~7 years old) and only works reliably on Pi 3 and earlier — it is not compatible with Pi 4 or Pi 5. For Pi 4, use Buster + the manual install script. For Pi 5, use Trixie.
R4R Buster was built for GoPiGo3 only and excluded other DI devices, but BrickPi3 libraries can be installed on top of it manually.
The library is now a pip package. Install from GitHub:
git clone https://github.com/DexterInd/BrickPi3.git
cd BrickPi3/Software/Python/brickpi3/scripts
source install_trixie.sh userThe user parameter creates a virtual environment at ~/.venv/brickpi. Activate it manually with:
source ~/.venv/brickpi/bin/activateOther parameter options:
local — creates the venv in the current directory insteadhardware=only — skips GUI libraries (for headless / Trixie Lite installs)Note: The installer no longer requires or assumes a pi user.
Enable SPI and I2C first (see section 2), then run:
curl -kL dexterindustries.com/update_brickpi3 | bashThis script installs the Python library and flashes the firmware. Reboot after completion.
The BrickPi3 communicates over SPI. Both SPI and I2C must be enabled before any software will work:
sudo raspi-configNavigate to Interface Options → enable SPI and I2C. Reboot. This is the fix for the majority of "No SPI response" reports.
If SPI is enabled and the error persists, the OS or install method is likely incompatible. Use Trixie, Bookworm, Bullseye, or Legacy Buster — and install via the pip method (install_trixie.sh). The old curl-based installer only works on Buster and will fail silently on newer releases, which can look like an "No SPI response" issue after a broken install.
Verify the BrickPi3 board is firmly seated on the Raspberry Pi GPIO pins. A partially connected board can produce intermittent "No SPI response" errors that are otherwise hard to diagnose.
This error always accompanies an installation issue. If you see this alongside "No SPI response," the BrickPi3 library was not installed correctly for your OS. Re-install using the pip method (install_trixie.sh), which works on Buster, Bullseye, Bookworm, and Trixie.
This error occurs during firmware flashing when the brickpi3samd_flash_firmware.sh script cannot identify the Raspberry Pi model. The auto_detect_rpi module is missing from the environment.
Workaround: Edit the flash script and hardcode the Pi version. Open the script:
nano ~/.venv/brickpi/lib/python3.*/site-packages/brickpi3/scripts/brickpi3samd_flash_firmware.shFind the line that calls python3 -c "import auto_detect_rpi..." and replace it with a static assignment, e.g.:
RPI_VERSION="RPI3"Adjust the version string to match your actual Pi model (RPI3, RPI4, etc.).
This was a known limitation of older firmware tools. The fix is to use the current pip-based installer (install_trixie.sh), which ships an updated flash tool that supports Pi 4. The old curl-based script does not resolve this.
If your firmware flash works but reverts after reboot, suspect a failing or read-only SD card. Test:
touch ~/testfile.txt
# Reboot, then check:
ls ~/testfile.txtIf the file disappears, the SD card has gone read-only — a sign of card corruption or failure. Duplicate the card to a new quality card (e.g., SanDisk Extreme Pro).
install_trixie.sh.
Power limitation: The BrickPi3's onboard power supply cannot deliver the 5V/4–5A the Pi 5 requires. You will need a separate power source for the Pi 5 itself — the official Raspberry Pi 27W USB-C Power Supply is the recommended option.
Cooling: The BrickPi3 acrylic case leaves no room for a fan — use a small heatsink on the Pi 5 instead.
Source: Compatibility between BrickPi3 and Raspberry Pi 5 (Nov 2023)
Pi 4 is supported on Legacy Buster 32-bit. Raspbian For Robots (Stretch) is not compatible with Pi 4. The old firmware flash script also blocked Pi 4 — this is resolved by using the current BrickPi3 library.
Pi 3 and 3B+ are fully supported on Legacy Buster, Trixie, and Raspbian For Robots (Stretch). This is the most tested combination.
.local hostname resolution requires Bonjour (especially on pre-Windows 11 systems). Install it if brickpi.local is not resolving.arp -a on your computer: run it once with the Pi off, then once with the Pi on — the new entry is the Pi's IP address.10.10.10.10 is exclusively for GoPiGo / Dexter OS — it is not applicable to BrickPi3. Do not use it.
Connect to your BrickPi3 via SSH using its hostname or IP address on your local network:
ssh brickpi@brickpi.localIf you need to configure WiFi after a headless install:
sudo nmcli device wifi connect "YourNetworkName" password "YourPassword"If you installed with install_trixie.sh user, activate the venv after logging in:
source ~/.venv/brickpi/bin/activateThe pre-built Trixie image does this automatically on login.
The BrickPi3 status LED indicates battery/power health:
If the LED flashes 4 times per second, the battery voltage is too low to drive motors — this is intentional hardware protection. Check your power supply:
If you see PermissionError: [Errno 13] Permission denied: '/dev/ttyAMA0', run your script with sudo:
sudo python3 your_script.pyAlternatively, add your user to the dialout group (persistent fix):
sudo usermod -a -G dialout $USERLog out and back in for the group change to take effect.
Use a quality SD card. Cheap or no-name cards can cause intermittent and hard-to-diagnose failures — including read-only filesystem corruption, firmware that won't persist after reboot, and random BrickPi communication errors. Recommended: SanDisk Extreme or SanDisk Extreme Pro.
The HC-SR04 cannot connect to the BrickPi3 sensor ports directly. Instead, connect it to unused Raspberry Pi GPIO pins, bypassing the Mindstorms connectors entirely.
Available GPIO pins that the BrickPi3 does not use: GP4, 8, 17, 22, 23, and 27, as well as GPIO pins on the 40-pin header not passed through the BrickPi3.
Resources:
Yes. As of 2024, Ubuntu 22.04 on Raspberry Pi 3B+ works without special configuration. Pull the latest BrickPi3 library from GitHub and install it.
One required step: add your user to the dialout group for hardware access permissions:
sudo usermod -a -G dialout $USERLog out and back in for the change to take effect.
Source: Consider supporting Ubuntu with BrickPi3 (Jan 2020 – Feb 2024) — confirmed by julian.w.francis
Yes. A community-maintained ROS2 BrickPi3 package is available on GitHub:
The package uses the BrickPi3 C library for motors and the Python library for sensors. It was built and tested on Ubuntu 22.04 with no special modifications beyond the dialout group fix above.
A common issue when combining BrickPi3 with Pygame (for joystick/gamepad input) is that calling pygame.init() can interrupt SPI communication to the BrickPi3. Key findings from community testing:
raspi-config — it can silently disable itself in some edge cases; re-enabling it has fixed this for users when nothing else worked.BP = brickpi3.BrickPi3()) before calling pygame.init().sudo raspi-config → Interface Options.Scratch support for BrickPi3 is no longer available. The Scratch extension relied on Scratch 1.4 and has not been maintained. There is no current path to using Scratch with BrickPi3.
Node.js is not actively supported. The existing Node libraries are pinned to v10.24.0 on Buster, and npm and serialport build attempts fail. There is no active developer maintaining Node.js support. If you get it working, the community encourages a pull request to the GitHub repository.