The following program implements a basic I2C client: #include With the simple call of Wire.begin() it will start an IC2 client that can react on messages. The Arduino program will import the library, a wrapper for basic I2C communications. The library of choice is Wire.h, and it comes bundled with the Arduino IDE or a third-party IDE like plattform.io. apt-install i2c-toolsįor the Arduino, no additional setup is required. To install all required software, execute the following commands to install the required libraries. The library of choice is SMBus, an I2C-based protocol. On the Raspberry Pi, we need to install a I2C Raspian package, and a library for Python. If you are unsure about the pin numbering and configuration, see the Raspberry Pi Pin Layout and Arduino Pin Layout, or read my earlier articles. Connect Raspberry Ground PIN => Arduino Ground.Connect Raspberry GPIO3 => Arduino D19 SCL.Connect Raspberry GPIO2 => Arduino D18 SDA.We first wire the two devices as follows: In the following setup, the Raspberry Pi will be the controller, and the Arduino Uno will be the client. We will see how to wire a Raspberry Pi and an Arduino Uno to form an I2C connection and exchange data between the two systems. This article continues the series with the I2C protocol, a half-duplex, bidirectional communication system with many-to-many servers and clients. In the last article, we investigated serial UART connection, a direct one-to-one interface. When you want to build complex microcontroller projects in which data needs to be exchanged between different devices, you need a fast and reliable way to exchange data.
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