The number of bytes available for reading. This should be called on a master device after a call to requestFrom() or on a slave inside the onReceive() handler. Returns the number of bytes available for retrieval with read().
Virtual wire library series#
String: a string to send as a series of bytesīyte: write() will return the number of bytes written, though reading that number is optional Writes data from a slave device in response to a request from a master, or queues bytes for transmission from a master to slave device (in-between calls to beginTransmission() and endTransmission()).
true will send a stop message after the request, releasing the bus. Wire.requestFrom(address, quantity, stop)Īddress: the 7-bit address of the device to request bytes from Used by the master to request bytes from a slave device. There are no address only you can select scl gpio, sda gpio and frequency This should normally be called only once.Īddress: the 7-bit slave address (optional) if not specified, join the bus as a master. Initiate the Wire library and join the I2C bus as a master or slave.