License along with this library if not, write to the Free Softwareįoundation, Inc. You should have received a copy of the GNU Lesser General Public Lesser General Public License for more details. MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. This library is distributed in the hope that it will be useful,īut WITHOUT ANY WARRANTY without even the implied warranty of Version 2.1 of the License, or (at your option) any later version. License as published by the Free Software Foundation either Modify it under the terms of the GNU Lesser General Public This library is free software you can redistribute it and/or To know more about the different arguments of these functions, and to know about the other important functions related to Wire, you can check the Arduino reference on - TWI/I2C library for Arduino & WiringĬopyright (c) 2006 Nicholas Zambetti. Alternatively, if master transmitted bytes to a slave, this function on the slave will be used to read the bytes Wire.read() − If a master send requestFrom() to slave, then it will read the returned byte using this function. Wire.write(byte) − Queue bytes for transmission from master to slave, or write data from slave in response to request from master Wire.SetClock(frequency) − Set the clock speed to frequency (in Hz) Wire.endTransmission() − End a transmission initiated by beginTransmission() Wire.beginTransmission(address) − Initiate transmission with the slave identified by address The important functions of this library are given below − For the sake of simplicity, this tutorial illustrated the process using. Here, you can add as many files as your library needs. The following pins are generally used for SPI −Īrduino has a built-in Wire library. Creating custom libraries for Arduino projects is as easy as moving the code you want to outsource to external class and header files located in a separate folder within the Arduino IDE’s standard libraries folder. Start/Stop sequence is required to signal start and end of communication If they want to send high level, they simply release the bus. two resistors pull the bus to a high level and the devices only send low levels. The data and clock lines are pulled up, i.e. The slave has to make sure that the next bit is ready when the clock pulse arrives
If the master wants to receive the data, it only generates clock pulses. Thus a maximum of 127 slaves with unique addresses can be connected to a single master.Īfter each byte, the receiver must send a 0 to acknowledge the reception of the byte The first byte sent by the master contains a seven-bit address and a read/ write bit indicating whether the next bytes will come from the master or should come from the slave. The slaves are not selected via a slave select line, but via address bits. I2C is synchronous because it uses a clock. It uses only two lines: One for data (SDA) and one for clock (SCL). Arduino refers to I2C as Wire, which is a shorter form of the term Atmel uses (Two Wire Interface or TWI). It is a popular communication protocol used by several peripherals like accelerometer and gyroscopes, OLED Displays, etc.
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