Light timers are back after briefly disappearing from the revamped Philips Hue app. Here's how to use them. By Ben Patterson Senior Writer, TechHive Aug 9, 2021 3:00 am PDT Image: Ben Patterson/IDG ...

Droplet and StackAR, developed by MIT’s Media Lab, allow users to set timers or program an Arduino using light-based communication. By pressing the tool against a screen, flashes of light can ...