That is a novel way to program a small device, I wonder how long it takes though. Archive: https://archive.today/HM5Ix From the post: >>[mitxela] has a tiny problem, literally: some of his projects are so small as to defy easy programming. While most of us would probably solve the problem of having no physical space on a board to mount a connector with WiFi or Bluetooth, he took a different path and gave this clever light-based programming interface a go.