This make the communication not byte to byte controlled as I want it to be for my need. I realized that if I wanted to make an Arduino slave, when receiving from master, it actually reads from a buffer that is already previously received. Written by Nicholas Zambetti and Shawn Bonkowski, demonstrates use of the Wire library. As you all know, this really simple example changes the value of a AD5171 digital potentiometer via I2C.

But let’s start with the problem found in the Wire. 1 I am starting to study the Wire library (no previous Arduino Wire library experience), I read some info taken from here. When the limitations were somehow fixed, even though the small number of modifications (it is somehow a sort of hacking of the library) I found that the my final result were so useful to me that I thought was worth to write a short article about it. Then, when experimenting with a portability of a project in the Arduino environment, I started to trying the official Wire library, discovering some incompatibilities for my needs. I have spent a lot of time on playing and later working on the I2C buses. I almost always used self developed libraries, both for learning and job requirement purposes.

Arduino wire library multiple bytes