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Si5351 I2C interface to Arduino should be 3.2 volt pull-up with 4.7K resistors. This can be obtained from 3.2 regulated volts in the arduino. Puulling I2C up to 5 volts may damage the Si5351 ( I found out the hard way!) . Power your Si5351 from 3.2 volts as well.
Demo code from QRP-Labs web site will work as a starting place but you will have to write your own tuning routine for your style of encoder or push-button tuning.
Build two units and use the second as a signal generator for the workbench.
On Sat, Jun 29, 2019, 11:51 PM SaMa photo SaMa photo <infosamaphoto@...> wrote: