The clock line is usually referred to as “SCL“. One wire provides a clock: this makes sure that both devices are sending information at the same speed. I2C is called a “two wire interface”, because it uses two wires to communicate. In this example, we show you how to send commands to the Arduino from the EV3 and how to write a program that requests data from the Arduino. In this tutorial, we setup the Arduino as an I2C slave, and the EV3 as an I2C master. The EV3 and the Arduino can be made to talk over I2C. This is probably the fastest way to add your own sensors and devices: when you connect the EV3 and the Arduino and the world is yours! You can easily modify this to send or receive any kind of data to the EV3, from accelerometer readings to geiger counter values. We’ll also demonstrate how to use the Arduino to read an analog values and send them to to the EV3. In this tutorial, we’ll use the Arduino Uno to read and write data to the LEGO Mindstorms EV3. You can order them on our website here, and on Amazon here. You can use the NXT Breadboard adapter to break out the Mindstorms sensor cable to use the NXT cable directly without messing up the cables. We use a breadboard to break out the I2C lines in this example. In this post we’ll show you how to use the EV3 blocks to communicate with the Arduino and any shields you may want to add to the EV3. We recently tried to make this easier by developing EV3 blocks for I2C communications. The EV3 is much more powerful than the NXT, but at the time of writing this article, the software available is much harder to hack with. In this HowTo, we’ll show you how to get your EV3 and your Arduino to communicate, and how to use Arduino Shields with the EV3.
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