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These examples show some of the features of the libraries that are included with Wiring. There are many other libraries available to do other exciting (and boring) things.

Serial
Simple read
Simple write
Simple read & write
Advanced output
Multiple Ports
Photoresistor & Serial
Reading a string
Sending multiple values to Processing
Reading data from Processing
RFID reader: parallax
Sparkfun USB weather board
Writing data to Processing

Wire
Digital potentiometer: AD5171
Master reader
Master writer
Slave receiver
Slave sender
Ultrasonic ranger: SFR08/SFR10
Compass heading: HMC6352 sparkfun
Real time clock: DS1307 sparkfun

Servo
Servo moving
Multiple servos
Servo & potentiometer

Stepper
Stepper move

Matrix
Hello Matrix
Sprite animation

LiquidCrystal
Printing data to parallel LCD display

Encoder
Encoder read

QSlide
Touch sensor

EEPROM
Storing data

NMEA
Basic positioning
Course to destination
Determining speed
Distance to destination
NMEA Sentence

Firmata
Analog inputs
Strings accept and echoing
Wire & Firmata
Servo & Firmata
Analog input/output pins
Digital input/output pins
Standard protocol
Standard protocol v2.0

Timer2
Executing a function every n milliseconds