Building a tuner with round LCD display

[FurnaceRocker]

Hey,

Anyone ever built a tuner with a round LCD display?  I'm going for a look here, and I'm comfortable building the circuitry, just how to program the display is intimidating to me.  Was thinking of using an Arduino, but again, don't really know where to start there.

Thanks!

[FiveseveN]

I'm confused, do you have the display and don't know how to interface with it or are you looking for a round one? Might make more sense to get a square one and mask it, there are many unknowns about your situation. Are you saying you're unfamiliar with programming for displays, for Arduinos or in C(++) in general?

[Marcos - Munky]

Do you want to build a tuner for the challenge on making one, of some other reason? Tuners are the kind of things that are hard to build a good one, and way easier and cheap to just buy one.

[FurnaceRocker]

I'm actually wanting to see if I could design an onboard tuner for my acoustic guitar.  I have an LR Baggs Anthem pickup, and I'd like to see if I can diy a tuner onto it, probably one that looks like Fishman's F1 or Flex.  I have found a round LCD screen at digikey.

I realize that I can get a different solution like a snark tuner, or even a different type of pickup, but that's not what I'm wanting.  I was curious about designing one from scratch, I haven't had much luck figuring out how to rig a different tuner to it.

[FiveseveN]

I have found a round LCD screen at digikey.

Which one?
And what is your experience with programming for Arduino and with electronics? Because

I haven't had much luck figuring out how to rig a different tuner to it.

That should be trivial: you just stick it on the output, the load would be insignificant.
FFT on the Arduino UNO can be done: https://github.com/dafnamargalit/Guitarduino-Tuner but it's significantly more difficult than tacking on a commercial tuner.

[FurnaceRocker]

The bigger issue I've had rigging another circuit to it is finding one with the look I'm going for.  I think I'd rather not do it than do something that will look dumb on my guitar.

The LCD I was thinking of using is this one https://www.digikey.com/en/products/detail/focus-lcds/E13RG62424LWAM450-N/12182134

As far as my experience with arduino, I've programmed a lot of fairly basic stuff, telling it to trigger lights and things when different sensors or buttons are triggered, as well as very simple lcd things (basically just displaying words).  In college I took a few programming classes that fit with my engineering degree, so I have some understanding of how programming works.  I can look at the code on the page you linked and understand what it's doing.

[FiveseveN]

That's good, other than some Arduino-compatible platform all you'll need is the appropriate FFC connector and a simple preamp. Take a look at the input stage from the pedalSHIELD UNO but really any boost should do.
That LCD has the popular ST7789 controller so there are libraries and tutorials for what you'll need:
https://github.com/adafruit/Adafruit-ST7735-Library
https://simple-circuit.com/arduino-st7789-ips-tft-display-example/
https://learn.adafruit.com/adafruit-gfx-graphics-library/overview
etc.