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. Returns None requestFrom Description Used by the master to request bytes from a slave device. Wire.begin(address) Parameters address: The 7-bit slave address (optional) if not specified, join the bus as a master. This should normally be called only once.
begin Description Initiate the Wire library and joins the I 2C bus as a master or slave. 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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