Did you know that whenever you blink, part of your brain temporarily shuts off? This is a fantastic idea that our brains have had, and an even more fantastic idea is to rig up all of our home electronics to work the same way.
The average adult blinks about 10 times per minute, and each blink lasts between 100 and 400 milliseconds. Assuming you're asleep for eight hours a day, that's like 13 million blinks per year, for a total time of over ten days with your eyes shut. And that's not even counting all the time you waste sleeping.
If you think about this in terms of energy, it means that you've got the lights and your computer and your TV on for 240 hours per year when you're not even looking at them. What a waste of energy! YOU'RE KILLING THE PLANET! Instructables user randofo has an ingenious solution to our murderous anti-environmental habits, which is to just rig up a light to an EMG sensor that can detect when you close your eyes or blink. Be amazed:
Whenever your eyes are open, you get light. Whenever your eyes are closed, lights off. It's brilliant. Except while you're blinking, when it's not. It sort of looks like the system isn't quite capturing all of randofo's blinks, but I'm sure that it's a problem that can be solved by cranking up the sensitivity a bit.
If you like this idea, for the sake of your brain integrity pay special attention to the last step on the Instructable:
Caution!!! Connecting your face to a DIY device that is plugged directly into the wall is a terrible idea. This Instructable was for entertainment purposes only. You should never replicate this."
To replicate this, simply follow the instructions at the link below.