I've reached the end of my rope with family members who won't turn off lights. I'd like to replace several light switches in my house with switches that just turn the lights off after 30 or 60 minutes.
Here's the thing though: Some of my circuits are 3-way. And I want the timer to start regardless of which switch is flipped.
The thought occurs that it should technically be a simple thing to build a switch that could start its timer any time power starts being supplied to the load and then flip itself to the other state when the timer expires. However, I've been unable to find such a product.
Any pointers would be greatly appreciated. Or, I'd gladly try to follow instructions. I've got some experience with solder and electronic components.