A LEGO Drum Machine Where the Speed of the Spinning Cylinder Sets the Tempo

Maker zomb23 built a drum machine around a rotating cylinder covered in LEGO studs. Orange pieces are placed on the grid to program beats, while a smartphone camera watches the cylinder and triggers sounds according to which pieces reach the front.

Spin the cylinder faster and the tempo increases; turn it the other way and the sequence plays in reverse. A software-style step sequencer has been turned into a physical object you can reprogram with LEGO and control by hand.