Making Open Source Hardware IoT with Raspberry Pi
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This document discusses how to create open source hardware for IoT using Raspberry Pi. It introduces Raspberry Pi add-on boards like HATs and pHATs, which have standard form factors and interface with the 40-pin GPIO header. The document outlines the requirements and specifications for HATs and pHATs, and how to design hardware following these standards. It also discusses open source hardware licenses, designing PCBs using tools like KiCAD, prototyping boards, and providing software support for open hardware projects.
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Since its inception, the layer has tracked and supported the Long Term Support (LTS) releases of the Yocto Project, including Dunfell (April 2020), Kirkstone (April 2022), and Scarthgap (April 2024), alongside active development in the main branch. Structured as a collection of layers tailored to different machine configurations, meta-rauc-community has delivered demo integrations for a wide variety of boards, utilizing their respective BSP layers. These include widely used platforms such as the Raspberry Pi, NXP i.MX6 and i.MX8, Rockchip, Allwinner, STM32MP, and NVIDIA Tegra.
Five years into the project, a significant refactoring effort was launched to address increasing duplication and divergence in the layer’s codebase. The new direction involves consolidating shared logic into a dedicated meta-rauc-community base layer, which will serve as the foundation for all supported machines. This centralization reduces redundancy, simplifies maintenance, and ensures a more sustainable development process.
The ongoing work, currently taking place in the main branch, targets readiness for the upcoming Yocto Project release codenamed Wrynose (expected in 2026). Beyond reducing technical debt, the refactoring will introduce unified testing procedures and streamlined porting guidelines. These enhancements are designed to improve overall consistency across supported hardware platforms and make it easier for contributors and users to extend RAUC support to new machines.
The community's input is highly valued: What best practices should be promoted? What features or improvements would you like to see in meta-rauc-community in the long term? Let’s start a discussion on how this layer can become even more helpful, maintainable, and future-ready - together.
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Making Open Source Hardware IoT with Raspberry Pi
- 1. Making Open Source Hardware IoT with Raspberry Pi Leon Anavi Konsulko Group [email protected] OpenIoT Summit 21-23 February, Portland, Oregon
- 2. Agenda Raspberry Pi add-on boards for IoT Raspberry Pi HAT Raspberry Pi pHAT Designing an open source hardware Software support
- 3. What is Open Source Hardware? Design of physical objects that is publicly available so that anyone can study, modify, distribute, make, and sell the design or hardware based on that design
- 4. Open Source Hardware Licenses GNU General Public License (GPL) Creative Commons Attribution-ShareAlike CERN Open Hardware License (OHL) TAPR Open Hardware License (OHL) FreeBSD MIT Other
- 5. Why Raspberry Pi? Low cost credit-card-sized computer Good software support Huge community NOT open source hardware!
- 6. Raspberry Pi 2009 - Raspberry Pi Foundation 2012 – The 1st Raspberry Pi 2014 – Raspberry Pi B+ 2016 – Raspberry Pi Zero
- 9. Important Change in B+ 40 pins 26 pins Raspberry Pi B+ (2014) Raspberry Pi B (2011)
- 11. 40 Pin Header
- 12. Raspberry Pi HAT Since 31st July 2014
- 13. Raspberry Pi HAT != Hat HAT (Hardware Attached on Top)
- 14. HAT Requirements Form factor and dimensions (65x56mm) 40 pin header compatible with Raspberry Pi B+ and the newer models EEPROM with device tree fragment Details: https://www.raspberrypi.org/blog/introducing-raspberry-pi-hats/ https://github.com/raspberrypi/hats
- 15. pHAT Form factor suitable for Raspberry Pi Zero with 4 mount holes and dimensions 65x30mm 40 pin through-hole header EEPROM not mandatory * Not an official standard of the Raspberry Pi Foundation
- 16. Sense HAT Official product of the Raspberry Pi Foundation Sensors for temperature, humidity, barometric pressure, gyroscope, accelerometer, magnetometer 8x8 RGB LED matrix Five-button joystick
- 17. More...
- 18. Making Your 1st HAT Requirements: Idea (for example: a blinking LED) Soldering equipment Adafruit Perma-Proto HAT Additional hardware resources (depending on the idea)
- 19. Device Tree Fragment Data structure with hardware description of the Raspberry Pi HAT stored on EEPROM 8 pin DIP I2C EEPROM Recommended EEPROM CAT24C32
- 20. Flashing the EEPROM Download and build eepromutils https://github.com/raspberrypi/hats Create a text file with description of your HAT using eeprom_settings.txt for example Generate .epp file using eepmake Flash the binary file to the EEPROM using eepflash.sh
- 21. EEPROM Wiring Flashing the EEPROM: pin 2 and 3 Reading from the EEPROM: pin 27 and 28
- 22. device-tree/hat Directory /proc/device-tree/hat Information about product name, version, vendor and UUID
- 23. Designing PCB Electronics Design Automation Suites: KiCAD (free & open source software) Eagle (free for small 2 Layer PCB) Other
- 24. KiCAD Advantages Free & open source software (GPLv3+) Cross platform (works on GNU/Linux distributions, MS Windows and Mac OS X) Integrated 3D viewer Contributions from CERN developers Used by Olimex for the design of their new open source hardware boards
- 25. HAT Templates KiCAD https://github.com/xesscorp/RPi_Hat_Template http://gitlab.openfet.com/julien/pihat-template Eagle http://www.flyfish-tech.com/pub/RasPi-BplusHAT.zip
- 26. My OSHW HAT & pHAT Anavi Flex HAT https://github.com/AnaviTech/anavi-flex Anavi Infrared pHAT https://github.com/AnaviTech/anavi-infrared
- 27. KiCAD Pcbnew
- 28. Recommendations Comply with the minimum requirements of the PCB manufacturer for trace spaces, drills and angular rings Keep in mind the complexity of the assembly process while designing the PCB Consider the location of Raspberry Pi components while placing components on your HAT and avoid any potential negative impact
- 29. Prototypes PCB printing services from: OSHPark (Made in the USA) China Local
- 30. Software Python is popular programming language among Raspberry Pi makers WiringPi library for C/C++ WiringPi language bindings: Java, JavaScript (Node.js), PHP, Perl, Go, Rust, etc. Other FOSS (LIRC, OpenCV, etc.)
- 31. … and one more thing Share your hardware and software under open source licenses :)
- 32. Thank You! Useful links: https://www.raspberrypi.org/blog/introducing-raspberry-pi-hats/ https://www.raspberrypi.org/magpi/make-your-own-hat/ http://pinout.xyz/ https://github.com/raspberrypi/hats https://github.com/AnaviTech http://wiringpi.com/ http://kicad-pcb.org https://oshpark.com/ http://www.slideshare.net/leonanavi/making-open-source-hardware-iot-with-raspberry-pi