The microcontroller must function as the master device, multiple masters are not supported.

A timeout feature is included to prevent lockups by faulty or missing hardware. Multiple objects (for multiple software I2C buses) and clock-stretching by slave devices are supported. Alternatively it is possible to pass references to functions which read and control the SDA and SCL lines, thereby allowing direct port manipulation to be used if preferred. The pins to be used for the serial data (SDA) and serial clock (SCL) control lines can be defined at run-time. Then the Library Manager will open and you will find a list of libraries that are already installed or ready for installation. Open the IDE and click to the 'Sketch' menu and then Include Library > Manage Libraries. It utilises the pinMode(), digitalWrite() and digitalRead() functions. To install a new library into your Arduino IDE you can use the Library Manager (available from IDE version 1.6.2). SoftWire is a software I2C implementation for Arduino and other Wiring-type environments.

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