Anyone who has enjoyed looking at the products that come from recycled circuit boards will enjoy this mouse pad. As with all circuit board products it is made of old useless ones, although this one ...

When you flip the optical mouse over, the red and blue lights should turn on. This light has the role of a sensor that recognizes the movement of the mouse, but by applying that sensor and modifying ...

If you're into hobbyist robotics or just want to keep track of your Roomba progress you may be interested in John Graham-Cumming's conversion of an inexpensive optical mouse into a robot odometer.