He’s constructed an Arduino keypad door lock — without using any ... Down the road he’s also planning on adding a knock sensor using the small speaker that is already part of the circuit ...

This voltage can be read by an Arduino digital input and then the Arduino can act upon it. The PIR Motion Sensor on the left is made by Parallax and sold by Radio Shack. The one on the right comes ...

Makers, developers and hobbyists looking to at the ability to monitor motion ... Arduino project may be interested in a new breakout board offering an all-in-one 9 Degree of Freedom (9-DoF) sensor ...