SparkFun Rotary Encoder - 200 P/R (Quadrature) General Rs. 1 - Rs. 500 A garden hose or other

A garden hose or other pressurized system should work just fine

This is a very common 22pF capacitor

Replaces: COM-09258

57600bps TTL serial interface

LCD Datasheet

SparkFun Rotary Encoder - 200 P/R (Quadrature) General Rs. 1 - Rs. 500 A garden hose or otherThis 200 pulse per rotation rotary encoder outputs gray code which you can interpret using a microcontroller and find out which direction the shaft is turning and by how much. This allows you to add feedback to motor control systems. Encoders of this kind are often used in balancing robots and dead reckoning navigation but it could also be used as a very precise input knob. The encoder comes with a set screw coupler which will attach to any 4mm shaft.