![]() Syntax Wire.available() Parameters None Returns The number of bytes available for reading. available Description Returns the number of bytes available for retrieval in the receive buffer. Length: The number of bytes to transmit Returns Byte: Write() will return the number of bytes written, though reading that number is optional. String: A string to send as a series of bytes Wire.write(data, length) Parameters value: A value to send as a single byte Syntax unsigned char Wire.endTransmission() Parameters None Returns 0 write Description Adds a character string or data to the end of the transmit buffer. Syntax Wire.beginTransmission(unsigned char address) Parameters address: The 7-bit address of the device to which to transmit Returns None endTransmission Description Ends a transmission to a slave device that was begun by beginTransmission() and transmits the bytes that were queued by write(). ![]() Subsequently, queue bytes for transmission with the write() function and transmit them by calling endTransmission(). beginTransmission Description Begin a transmission to the I 2C slave device with the given address. Returns Byte: The number of bytes returned from the slave device. False will continually send a restart after the request, keeping the connection active. True will send a stop message after the request, releasing the bus. Quantity: The number of bytes to request. Wire.requestFrom(address, quantity, stop) Parameters address: The 7-bit address of the device from which to request bytes. Syntax Wire.requestFrom(address, quantity) The bytes may then be retrieved with the available() and read() functions. ![]() Syntax Wire.begin() Parameters None Returns None requestFrom Description Used by the master to request bytes from a slave device. Wire: 21(SCL), 20(SDA) begin Description Initiates the Wire library. Not supported for operating as a slave device. The available channels and pin numbers are as follows and can also be confirmed on the pin map. ![]() The pull-up to communication lines is needed. This is an I 2C communications library that facilitates two-wire class communications with I 2C/TWI devices (also called "Wire Library").
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