in the Arduino 22 IDE and below, the read() and write() commands are receive() and send() instead. It should be noted that for this example/explanation the Arduino IDE 1.00 is used, and future as well as past versions may vary slightly. To use the I2C bus with the Arduino, the WIRE library, which is already a part of the Arduino IDE is used. In the simplest implementation, the grounds of both Arduino Boards should be shared as well. For other variations, the datasheet should be checked.Īs long as the SDA of one is connected to the other, and SCL of one is connected to the other, the I2C Hardware implementation is complete. On the UNO they are pins 4 and 5 for SDA and SCL, while on the Mega they are 20 and 21. The Arduino communicates on the I2C bus via already dedicated pins. More information about the I2C bus can be found in the reading material at the end of this post. It also only requires 2 wires (SDA and SCL) that are required for communication. Upon research of various communication options available, I2C stood out as a protocol that was already available and established, as well as simple to implement. The main purpose of setting up an I2C bus was to get two Arduino Boards to talk to each other. Implementing I2C between two Arduino Boards Analog Devices produce a few of those devices, and in this implementation, an ADUM1250 will be used. Third part is implementation of the Galvanic Isolation. There are many of these on the market, and a P82B715 will be used to implement this. Because of the nature of I2C, a bus extender is required. ![]() Second part of the procedure is to implement the same bus over a wire length that is 7 meters long. However, more on that in detail in the implementation. Surprisingly, due to the nature of the Arduino WIRE library, this is a lot more complicated than it should be, or at least as intuition lends it to be. In the final part of this process, the Slave sends back two bytes in reply. This was then repeated by sending 6 bytes to the Master, and getting one byte back from the Slave. In the second instance, the slave processes that data, and sends a response back to the Master. ![]() This was done by first sending a byte from the Master to Slave and seeing if it reaches the Slave. This was done by taking two pieces of wire (short length, about 20mm), where both the boards had the same 5V and Ground. The first thing to do was to establish an I2C between two Arduino boards. Requirement: To communicate between two Arduino Mega boards, about 7 meters apart, sending 6 bytes of data, and receiving 2 bytes of data back from the other board, keeping the supplies and grounds for both the supplies separate.
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