Water Heater Monitor
A program for the Particle Photon that monitors the status of my water heater and reminds me to switch it off in time.
If the heater continues to be on after a specified amount of time has elapsed, it broadcasts an event that gets picked up by an IFTTT recipe, which in turn sends a push notification to my phone. It also blinks the Photon's onboard LED in case I miss the notification for some reason.
Here is a picture of the first version of the device all wired up: