Laser Turret
2 Axis (pan and tilt) turret with LaserDiode as TCP. Different movement speeds, automated movement "cat play" and 7 Segment display
You need:
2 Servo motors
Arduino UNO
7 Segment Display
Shift Register ( mine is 1538HXL)
rotary encoder
LED
Laser Diode
some resistors (depends on your LED's and 7 Segment Display ~220ohm)
lots of cable