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Wire Library

This library allows you to communicate with I2C / TWI devices. On the Arduino, SDA (data line) is on analog input pin 4, and SCL (clock line) is on analog input pin 5.

Functions

• begin()
• begin(address)
• requestFrom(address, count)
• beginTransmission(address)
• endTransmission()
• send()
• byte available()
• byte receive()
• onReceive(handler)
• onRequest(handler)

Note

There are both 7- and 8-bit versions of I2C addresses. 7 bits identify the device, and the eighth bit determines if it's being written to or read from. The Wire library uses 7 bit addresses throughout. If you have a datasheet or sample code that uses 8 bit address, you'll want to drop the low bit (i.e. shift the value one bit to the right), yielding an address between 0 and 127.

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