I just recently changed my utility plan to one that charges much more for on peak vs off peak. Living in a house with roommates its a bit of a challenge to remind everyone of this, especially when I am not around. I figured however it should be possible to make a super simple, time based LED alert system. Place one of these little alert devices on power hungry appliances to make everyone more aware of their power use.
The design is simple, an arduino Beetle (small, cheap leonardo), a single WS2811 LED and a power supply. I know how to get the arduino to talk to the LED, however after doing some research I wasnt able figure out the best way to program the LED to change at certain times. I see that there is a "time" library but not sure how best to utilize that. Maybe someone has a good example of a project that does something at a certain time?
Once I can get this to work reliably I would love to release an instructible so other people can make this as well.