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I have a SI5351 Signal Generator running an I2C 4 line LCD, I just had to jumper a non stock address on the I2C adapter.

You can run the I2C address scanner to find out where things are?

Mike, WA6ISP

So it's an i2c display, using the same SDA and SCL lines as the Si5351?
That seems ideal if there aren't any issues, as we're about out of pins on the Nano.
That's relevant.

Displays with the little i2c adapter board added on are quite cheap.
If not specified they are likely operating at 5v as that's what most of the Arduino world wants.
I'd choose a 3.3v display and not 5v though. ?If it had pullups to 5v on board there would be
some current getting dumped into the Si5351 die's SDA and SCL protection diodes.

If the Si5351 were on the main board, it would be easy to wire up the an i2c display and tuning pot
to the processor board of our choosing. ?No need for a Raduino board.
(I know, broken record here.)

Jerry, KE7ER

On Fri, Jun 30, 2017 at 03:08 pm, Jeff wrote:

I am not sure it is relevant but I changed to a serial display and all the tuning clicks disappeared with the new display. Nice discussion by the way I am getting my education!

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Mike Hagen, WA6ISP
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