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It should be in a folder of its own, and will typically contain at least two files, one with a. To do so, download the library and unzip it. If you're using one of these libraries, you need to install it first. Sprite - Basic image sprite manipulation library for use in animations with an LED matrix.Matrix - Basic LED Matrix display manipulation library.These libraries are compatible Wiring versions, and the links below point to the (excellent) Wiring documentation. Wire - Two Wire Interface ( TWI/I2C) for sending and receiving data over a net of devices or sensors.Stepper - for controlling stepper motors.SoftwareSerial - for serial communication on any digital pins.SPI - for communicating with devices using the Serial Peripheral Interface (SPI) Bus.LiquidCrystal - for controlling liquid crystal displays ( LCDs).Firmata - for communicating with applications on the computer using a standard serial protocol.Ethernet - for connecting to the internet using the Arduino Ethernet Shield.EEPROM - reading and writing to "permanent" storage.To use a library in a sketch, select it from Sketch > Import Library. working with hardware or manipulating data. Libraries provide extra functionality for use in sketches, e.g. Reference Language | Libraries | Comparison | Changes