Encoder
The Wiring Encoder library allows for easily reading and writing a position or angle from an encoder.
The encoders are sensors used to track the position or rotation rate of a shaft. Encoders generate pulses when moved, on each pulse triggering an event on the Wiring I/O board, for this reason the phaseA pin of an encoder can only be connected to a Wiring pin capable of generating external interrupts. The Encoder library works on pins 2, 3, 38 and 39, so only four encoders can be working at the a time.
Encoder()
Class for manipulating encoders attached to the Wiring hardware.
attach()
Attaches an encoder variable to an encoder connected to a pin.
detach()
detaches an encoder variable from a pin.
read()
Reads the encoder position or angle.
write()
Sets the encoder position or angle.
attached()
Returns whether or not en encoder is attached to a pin.