Apparently I2C is easy to use! Well unfortunately it's not for me! I have a NANO as a slave, which has 4 variables in it (Hrs, Min, etc gained by reading a GPS unit). That all works OK. I have a UNO as the master which would like to be able to read those 4 variables (all under 255) and then do so…

A nightmare with I2C serial link, especially with onReceive

jremington August 28, 2021, 5:25pm 9

It usually is, if you use I2C for the design purpose, which is communication between chips on a single PCB.

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