The last project I built, the Masochist’s Video Card reminded me of how fun pure TTL digital design can be and since the 7400 contest seems to be allowing multiple entries, I figured why not build something else?
The accelerometer is an interesting sensor that is now extremely tiny thanks to MEMS technology. Specifically, the accelerometer senses gravity, and since earth has a constant 1 g-force always pulling toward the center, we can use that reference to find the tilt of any object. With some digital design and LEDs added to the mix we can even build a tilt sensor as I will show you in this article.
TTL Tilt Sensor - [Link]