Add OLED Display

[nathanlong85]

Display functionality needs to be added to display PC values in #6.

• Should use the U8G2 library
• Mock up and implement a basic screen layout

Arduino has either hardware or software SPI. Ideally, I'll use hardware because it's faster (which is good for both storage AND the display). This means I need to use specific pins:

Pin	Name	AKA	Shared Between SPI Devices	Notes
50	MISO (Master In Slave Out)	SDO, DO	Yes
51	MOSI (Master Out Slave In)	SDI, DI	Yes
52	SCK (Serial Clock)	SCLK	Yes
53, ?	CS (ChipSelect)	SS (SlaveSelect)	No	53 isn't required, nor is it the only pin that can be used for this. It just makes sense to use because it can't be used for any other input... 53 is the dedicated CS port when the Arduino itself is being used as a slave SPI device.

I need to figure out which pins to use for the CS lines from the devices... 53 seems to be the official one, but I'm not sure if a dedicated pin is actually needed or not.

[nathanlong85]

Here is the simulation I used to create the attached screenshot. The code from there is really rough and not dynamic... the values are all fixed.