Singing Lazy Susan (Crazy Adam) with Hand-made Sensor Brush.

Step 5 Hand-made sensor brush

Now it's the step to make a sensor sensing the table turning and to control the on and off of the music.

It's basically a hand-made brush as shown in the picture -- made with two pieces of any kind of conductive materials, here we used spring steel. We used the bench grinder to shape the steel a little bit. Align the strips well (~ 15 degree angle to the board.) Arrange copper tapes parallel to the line that links the ends of the two metal strips on the board.

We came up with the idea of wrapping the ends of the metal strips with copper tapes, so that the brush can travel across copper tapes smoothly in both directions and can conduct/sense the table turning.