Making Open Source Hardware IoT with Raspberry Pi

Making Open Source Hardware IoT
with Raspberry Pi
Leon Anavi
Konsulko Group
leon.anavi@konsulko.com
OpenIoT Summit
21-23 February, Portland, Oregon

Agenda
 Raspberry Pi add-on boards for IoT
 Raspberry Pi HAT
 Raspberry Pi pHAT
 Designing an open source hardware
 Software support

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

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

Why Raspberry Pi?
 Low cost credit-card-sized computer
 Good software support
 Huge community
 NOT open source hardware!

Raspberry Pi
 2009 - Raspberry Pi Foundation
 2012 – The 1st
Raspberry Pi
 2014 – Raspberry Pi B+
 2016 – Raspberry Pi Zero

Important Change in B+
40
pins
26
pins
Raspberry Pi B+
(2014)
Raspberry Pi B
(2011)

Raspberry Pi HAT
Since 31st
July 2014

Raspberry Pi HAT
!=
Hat HAT
(Hardware Attached on Top)

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

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

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

Making Your 1st
HAT
Requirements:
 Idea (for example: a blinking
LED)
 Soldering equipment
 Adafruit Perma-Proto HAT
 Additional hardware resources
(depending on the idea)

Device Tree Fragment
 Data structure with hardware description of
the Raspberry Pi HAT stored on EEPROM
 8 pin DIP I2C EEPROM
 Recommended EEPROM CAT24C32

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

EEPROM Wiring
 Flashing the EEPROM: pin 2 and 3
 Reading from the EEPROM: pin 27 and 28

device-tree/hat
 Directory /proc/device-tree/hat
 Information about product name, version,
vendor and UUID

Designing PCB
Electronics Design Automation Suites:
 KiCAD (free & open source software)
 Eagle (free for small 2 Layer PCB)
 Other

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

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

My OSHW HAT & pHAT
Anavi Flex HAT
https://github.com/AnaviTech/anavi-flex
Anavi Infrared pHAT
https://github.com/AnaviTech/anavi-infrared

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

Prototypes
PCB printing services from:
 OSHPark (Made in the USA)
 China
 Local

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.)

… and one more thing
Share your hardware and
software under open
source licenses :)

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

Making Open Source Hardware IoT with Raspberry Pi

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