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I saw that AliExpress had tiny OLED displays for just a few bucks, so I decided to order a few and figured that I would find a use for them. I haven’t found a use for them yet, but I figured I should go ahead and document what I did.

Here’s what you will need:

Wiring it up was easy. I had already soldered header pins onto the Wemos and the OLED already had a header, so I just had to connect 4 jumper wires. The schematic below shows how you need to wire it up. Keep in mind that you can connect to 3v3 if you need to. The OLED will work on voltage ranging from 3v to 5v.

Wemos w/ OLED schematic

I also learned that you can get OLED displays that need 6 connections. Those use SPI, whereas the one in this post uses I2C. With I2C, you obviously use 2 fewer wires, but it is supposedly slower. I have nothing to compare it to, so I don’t really know how much slower. But it seems to do things fast enough for anything I would expect myself to use it for. So keep that in mind if you are planning on making a video game (Pong?) or something similar out of this.

Next, you need to add the Adafruit libraries to Arduino IDE in order to control the . Open Arduino IDE and click Sketch -> Include Library -> Manage Libraries. Search for Adafruit, and scroll down to the Adafruit Gfx library and install it. Next, scroll down to the Adafruit SSD1306 library and install it.

Next, you can use the following code to output text to the display. This creates a scrolling message:

 

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