Hell, if you only need to detect if an object is tilted, you can get a simple “ball in a tube” tilt sensor for pennies. [tamberg] liked this idea, but he required a tilt sensor that works in ...

Speaking of throwing up flags, one of the coolest parts of this project is the toy mailbox ... so he switched to a mechanical tilt sensor. An IR LED on the ceiling and a phototransistor on the ...