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<a class="urllink" href="http://www.arduino.cc/blog/" rel="nofollow">Blog »</a><a class="urllink" href="http://www.arduino.cc/cgi-bin/yabb2/YaBB.pl" rel="nofollow">Forum »</a><a class="urllink" href="http://www.arduino.cc/playground/" rel="nofollow">Playground »</a>
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<p><strong>Reference</strong> <a class='wikilink' href='index.html'>Language</a> | <a class='selflink' href='Libraries.html'>Libraries</a> | <a class='wikilink' href='Comparison.html'>Comparison</a> | <a class='wikilink' href='Changes.html'>Changes</a>
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</p>
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<p class='vspace'></p><h2>Libraries</h2>
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<p>Libraries provide extra functionality for use in sketches, e.g. working with hardware or manipulating data. To use a library in a sketch, select it from <strong>Sketch > Import Library</strong>.
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</p>
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<p class='vspace'></p><h3>Standard Libraries</h3>
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<ul><li><a class='wikilink' href='EEPROM.html'>EEPROM</a> - reading and writing to "permanent" storage
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</li><li><a class='wikilink' href='Ethernet.html'>Ethernet</a> - for connecting to the internet using the Arduino Ethernet Shield
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</li><li><a class='wikilink' href='Firmata.html'>Firmata</a> - for communicating with applications on the computer using a standard serial protocol.
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</li><li><a class='wikilink' href='LiquidCrystal.html'>LiquidCrystal</a> - for controlling liquid crystal displays (<span class='wikiword'>LCDs</span>)
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</li><li><a class='wikilink' href='SD.html'>SD</a> - for reading and writing SD cards
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</li><li><a class='wikilink' href='Servo.html'>Servo</a> - for controlling servo motors
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</li><li><a class='wikilink' href='SPI.html'>SPI</a> - for communicating with devices using the Serial Peripheral Interface (SPI) Bus
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</li><li><a class='wikilink' href='SoftwareSerial.html'>SoftwareSerial</a> - for serial communication on any digital pins
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</li><li><a class='wikilink' href='Stepper.html'>Stepper</a> - for controlling stepper motors
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</li><li><a class='wikilink' href='Wire.html'>Wire</a> - Two Wire Interface (<span class='wikiword'>TWI/I2C</span>) for sending and receiving data over a net of devices or sensors.
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</li></ul><p class='vspace'></p><p>These libraries are compatible Wiring versions, and the links below point to the (excellent) Wiring documentation.
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</p>
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<p class='vspace'></p><ul><li><a class='urllink' href='http://wiring.org.co/reference/libraries/Matrix/index.html' rel='nofollow'>Matrix</a> - Basic LED Matrix display manipulation library
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</li><li><a class='urllink' href='http://wiring.org.co/reference/libraries/Sprite/index.html' rel='nofollow'>Sprite</a> - Basic image sprite manipulation library for use in animations with an LED matrix
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</li></ul><p class='vspace'></p><h3>Contributed Libraries</h3>
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<p>If you're using one of these libraries, you need to install it first. To do so, download the library and unzip it. It should be in a folder of its own, and will typically contain at least two files, one with a .h suffix and one with a .cpp suffix. Open your Arduino sketchbook folder. If there is already a folder there called <strong>libraries</strong>, place the library folder in there. If not, create a folder called <strong>libraries</strong> in the sketchbook folder, and drop the library folder in there. Then re-start the Arduino programming environment, and you should see your new library in the <strong>Sketch > Import Library</strong> menu.
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</p>
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<p class='vspace'></p><p>For details, see the page on <a class='wikilink' href='Guide_Environment#libraries.html'>the Arduino environment</a>.
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</p>
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<p class='vspace'></p><p>Communication (networking and protocols):
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</p><ul><li><a class='urllink' href='http://www.arduino.cc/playground/Code/Messenger' rel='nofollow'>Messenger</a> - for processing text-based messages from the computer
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</li><li><a class='urllink' href='http://sundial.org/arduino/index.php/newsoftserial/' rel='nofollow'>NewSoftSerial</a> - an improved version of the <span class='wikiword'>SoftwareSerial</span> library
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</li><li><a class='urllink' href='http://www.arduino.cc/playground/Learning/OneWire' rel='nofollow'>OneWire</a> - control devices (from Dallas Semiconductor) that use the One Wire protocol.
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</li><li><a class='urllink' href='http://www.arduino.cc/playground/Main/PS2Keyboard' rel='nofollow'>PS2Keyboard</a> - read characters from a <span class='wikiword'>PS2</span> keyboard.
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</li><li><a class='urllink' href='http://www.arduino.cc/playground/Code/SimpleMessageSystem' rel='nofollow'>Simple Message System</a> - send messages between Arduino and the computer
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</li><li><a class='urllink' href='http://code.google.com/p/sserial2mobile/' rel='nofollow'>SSerial2Mobile</a> - send text messages or emails using a cell phone (via AT commands over software serial)
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</li><li><a class='urllink' href='http://code.google.com/p/webduino/' rel='nofollow'>Webduino</a> - extensible web server library (for use with the Arduino Ethernet Shield)
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</li><li><a class='wikilink' href='http://arduino.cc/en/Tutorial/X10'>X10</a> - Sending X10 signals over AC power lines
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</li><li><a class='urllink' href='http://code.google.com/p/xbee-arduino/' rel='nofollow'>XBee</a> - for communicating with <span class='wikiword'>XBees</span> in API mode
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</li><li><a class='urllink' href='http://www.arduino.cc/playground/Code/SerialControl' rel='nofollow'>SerialControl</a> - Remote control other Arduinos over a serial connection
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</li></ul><p class='vspace'></p><p>Sensing:
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</p><ul><li><a class='urllink' href='http://www.arduino.cc/playground/Main/CapSense' rel='nofollow'>Capacitive Sensing</a> - turn two or more pins into capacitive sensors
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</li><li><a class='urllink' href='http://www.arduino.cc/playground/Code/Debounce' rel='nofollow'>Debounce</a> - for reading noisy digital inputs (e.g. from buttons)
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</li></ul><p class='vspace'></p><p>Displays and <span class='wikiword'>LEDs</span>:
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</p><ul><li><a class='urllink' href='http://web.alfredstate.edu/weimandn/arduino/LiquidCrystal_library/LiquidCrystal_index.html' rel='nofollow'>Improved LCD library</a> fixes LCD initialization bugs in official Arduino LCD library
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</li><li><a class='urllink' href='http://www.arduino.cc/playground/Code/GLCDks0108' rel='nofollow'>GLCD</a> - graphics routines for LCD based on the <span class='wikiword'>KS0108</span> or equivalent chipset.
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</li><li><a class='urllink' href='http://www.arduino.cc/playground/Main/LedControl' rel='nofollow'>LedControl</a> - for controlling LED matrices or seven-segment displays with a <span class='wikiword'>MAX7221</span> or <span class='wikiword'>MAX7219</span>.
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</li><li><a class='urllink' href='http://www.wayoda.org/arduino/ledcontrol/index.html' rel='nofollow'>LedControl</a> - an alternative to the Matrix library for driving multiple <span class='wikiword'>LEDs</span> with Maxim chips.
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</li><li><a class='urllink' href='http://www.arduino.cc/playground/Main/LedDisplay' rel='nofollow'>LedDisplay</a> - control of a <a class='urllink' href='http://sigma.octopart.com/23295/datasheet/Avago-HCMS-2973.pdf' rel='nofollow'>HCMS-29xx</a> scrolling LED display.
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</li></ul><p class='vspace'></p><p>Frequency Generation and Audio:
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</p><ul><li><a class='urllink' href='http://code.google.com/p/arduino-tone/' rel='nofollow'>Tone</a> - generate audio frequency square waves in the background on any microcontroller pin
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</li></ul><p class='vspace'></p><p>Motors and PWM:
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</p><ul><li><a class='urllink' href='http://www.arduino.cc/playground/Learning/TLC5940' rel='nofollow'>TLC5940</a> - 16 channel 12 bit PWM controller.
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</li></ul><p class='vspace'></p><p>Timing:
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</p><ul><li><a class='urllink' href='http://www.arduino.cc/playground/Code/DateTime' rel='nofollow'>DateTime</a> - a library for keeping track of the current date and time in software.
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</li><li><a class='urllink' href='http://www.arduino.cc/playground/Code/Metro' rel='nofollow'>Metro</a> - help you time actions at regular intervals
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</li><li><a class='urllink' href='http://www.arduino.cc/playground/Main/MsTimer2' rel='nofollow'>MsTimer2</a> - uses the timer 2 interrupt to trigger an action every N milliseconds.
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</li></ul><p class='vspace'></p><p>Utilities:
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</p><ul><li><a class='wikilink' href='http://arduino.cc/en/Tutorial/TextString'>TextString</a> aka <a class='wikilink' href='http://arduino.cc/en/Tutorial/TextString'>String</a> - handle strings
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</li><li><a class='urllink' href='http://sundial.org/arduino/index.php/pstring/' rel='nofollow'>PString</a> - a lightweight class for printing to buffers
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</li><li><a class='urllink' href='http://arduiniana.org/libraries/streaming/' rel='nofollow'>Streaming</a> - a method to simplify print statements
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</li></ul><p class='vspace'></p><p>For a guide to writing your own libraries, see <a class='wikilink' href='http://arduino.cc/en/Hacking/LibraryTutorial'>this tutorial</a>.
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<p class='vspace'></p><p><a class='wikilink' href='index.html'>Reference Home</a>
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<p class='vspace'></p><p><em>Corrections, suggestions, and new documentation should be posted to the <a class='urllink' href='http://www.arduino.cc/cgi-bin/yabb2/YaBB.pl?board=swbugs' rel='nofollow'>Forum</a>.</em>
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</p>
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<p class='vspace'></p><p>The text of the Arduino reference is licensed under a
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<a class='urllink' href='http://creativecommons.org/licenses/by-sa/3.0/' rel='nofollow'>Creative Commons Attribution-ShareAlike 3.0 License</a>. Code samples in the reference are released into the public domain.
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