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The LEDs are so bright that it hurts to look directly at them
Replaces: COM-09258
ST7066 Datasheet
57600bps TTL serial interface
A garden hose or other pressurized system should work just fine
SparkFun Rotary Encoder - 200 P/R (Quadrature) General Rs. 1 - Rs. 500 The LEDs are so brightThis 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.