Question 1

what can you do with it

Accepted Answer

I use one as a weather station display with an esp8266.  I use another as a display for an APRS tracker.  The uses are virtually limitless

Question 2

Can I run multiple displays from the same i2c bus?

Accepted Answer

Yes, you may select 1 of 2 addresses so you can run 2 from the same buss. BUT, there is one other problem that may get you. 
Using the recommended library, each instance of the display uses 1k bytes of memory for screen storage, plus a fair amount for housekeeping. So, depending on the computing device you're using you may not have enough memory to run two of these displays. For example, using an Arduino UNO with one display and just a 'Hello World' I received a low memory warning from the compiler. There are a couple work arounds.

1) If you don't need graphics go to GitHub (https://github.com/greiman/SSD1306Ascii) and download the Arduino SSD1306Ascii library. It's lightweight and versatile, but doesn't provide pixel by pixel graphics. This is what I did for the project I built using this display.
2) Use an Arduino Mega, Raspberry Pi, Beagle Bone, or something else that can access more memory.
3) Something I considered but didn't use because it seemed to be overkill plus, I didn't need the graphics, is use a dedicated board like a NANO to drive the display and send it commands from your main processor. Lots of advantages to that but approach but some disadvantages too.
4) Last but not least is when I get around to it I may design a board using something like an ATmega640 to act as display driver for this, and similar, displays. Maybe a little bit of overkill too, but it's a thought.

Finally, aside from the memory issue, I really like these displays. :)

Question 3

Where can I find code examples/libraries for this?

Accepted Answer

Dear Sir,
Here is the link of libraries, please check it.
https://github.com/supprot/ArducamSSD1306
If you need any support, please feel free to contact us.
Best regards,
Arducam Support Team

Question 4

I lost my paper that said how to use the product. How can I view it online?

Accepted Answer

Here you are: https://www.uctronics.com/download/Amazon/U602602.pdf

ASIN	B072Q2X2LL
Best Sellers Rank	#3,183 in Computers ( See Top 100 in Computers ) #32 in Single-Board Computers
Brand	UCTRONICS
Built-In Media	1pcs UCTRONICS 0.96 Inch 128X64 Yellow Blue OLED Display Module
Compatible Devices	Single-board Computers, Microcontrollers
Connectivity Technology	I2C
Customer Reviews	4.6 4.6 out of 5 stars (943)
Item Dimensions L x W x H	30L x 30W x 10H millimeters
Item Weight	0.35 Grams
Manufacturer	UCTRONICS
Memory Storage Capacity	8 GB
Mfr Part Number	U602602
Model Name	U602602
Model Number	U602602
Number of Items	1
Number of Packs	1
Operating System	Linux
Processor Brand	Broadcom
Processor Count	1
RAM Memory Technology	I2C
Total Usb Ports	1
Unit Count	1 Count
Wireless Compability	802.11a/b/g/n/ac

UCTRONICS 0.96 Inch OLED Module 12864 128x64 Yellow Blue SSD1306 Driver I2C Serial Self-Luminous Display Board for Arduino Raspberry Pi Pico

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