The software/hardware project has seen many stages over the years, I tried to sum them up here (taken from the Readme):
* Wired up to my Mac controlled by a weird combination of Kernel extensions and Java code.
* Connected to a Synology NAS with a self-soldered Velleman K8055 USB experimentation board.
* Connected to a Raspberry PI, running a Ruby script locally, node.js on the server side.
* Wiring mostly replaced by a custom etched circuit board - a Raspberry shield built only for the purpose of changing the traffic light (and debugging it at home without disassembling the whole traffic light).
* Replacement of the Raspbian/Ruby client with Elixir and Nerves.
* Replacement of the node.js server with Elixir and Phoenix.
Happy for any feedback!