Introduction to Nerves @amselixir

Introduction to nerves and demo of a temperature controlled closet for fermenting. See https://github.com/tverlaan/brew_ex

Transcript

1. Introduction to Nerves Timmo Verlaan (@diptimmo)
3. WAIT... WHAT?!
4. Enter Elixir • Fault tolerance • Constrained hardware • Concurrency • Binary protocols • Etc...
5. Nerves vs Raspbian Nerves Raspbian Cold Boot to App 3-6 seconds 30-60 seconds Zipped FW Image ~13-18 MB ~350-500 MB Update Strategy Entire Image Just Application Root Partition 64-128 MB 1-2 GB Fallback Strategy A/B Partitions ??? Unpluggability R/O Root Partition ???
9. Getting started $ mix nerves.new hello_nerves --target rpi3 $ cd hello_nerves $ mix deps.get
10. mix compile $ mix compile Nerves Precompile Start ... Compile Nerves toolchain Downloading from Github Cache Unpacking toolchain to build dir ... Generated nerves_system_rpi3 app [nerves_system][compile] [nerves_system][http] Downloading system from cache [nerves_system][http] System Downloaded [nerves_system][http] Unpacking System ... Nerves Env loaded Nerves Precompile End
12. Future • More boards • LinkIt Smart 7688 • C.H.I.P • Display / Touchscreen support • Network firmware update • Video camera support • Better docs
15. Beer
16. Hardware • Raspberry Pi 2 • DS18B20 1wire digital temperature sensor • 2x SSR-10DA solid state relay • 2x LED/diode • Fridge • Power!
17. Enabling 1wire # config/config.exs config :nerves, :firmware, fwup_conf: "config/fwup.conf" # config/fwup.conf file-resource config.txt { host-path = "${NERVES_APP}/config/config.txt" } # config/config.txt dtoverlay=w1-gpio-pullup,gpiopin=4
18. Core logic defp control(temp, system) when temp > @high do system.bulb |> off system.fridge |> on end defp control(temp, system) when temp < @low do system.bulb |> on system.fridge |> off end defp control(_, system) do system.bulb |> off system.fridge |> off end
19. Poof!
20. Wait for it!
21. Taste! But don't judge ;-)
22. Big thanks Springest @tuxified @NervesProject team Bas!
23. Useful resources • https://github.com/tverlaan/brew_ex • https://hexdocs.pm/nerves/getting-started.html • https://github.com/nerves-project/nerves-examples • http://nerves-project.org/ • #nerves channel on elixir-lang slack • AMA!