What is it?

It is a Shield for a D1 Mini style ESP8266 board that has connections for a Nokia 5110 and for OLED screens. These are both really common style of displays that are used with Arduino projects and can be bought really cheaply from Aliexpress or eBay

Why did you make it?

A huge amount of my projects boiled down to fetching data from some place on the internet and displaying it on a screen.

Any screen shields that are readily available for a D1 mini have too small displays for what I wanted (0.66")

Since these small screens were not an option, I was getting pretty tired of wiring up the exact same wires over and over again just to connect the D1 mini to the display! The OLED screens aren't that big of a deal as there are only 4 wires, but the Nokia screen has 8 wires and was definitely a pain!

This shield makes connecting up these larger displays as simple as possible!

What makes it special?

• Use the displays with no external circuitry, just plug in the D1 mini and your screen of choice and you're good to go!
• Sample code for the different screens provided to get you started.
• Additional free pins are broken out to the side of the shield so functionality can be extended.
• Shield is also compatible with OLEDs that have the VCC and GND swapped (more info below)

Sounds good, Anything wrong with it?

Glad you asked. This my first version of the PCB and there are some mistakes on it. They are nothing that prevents it from working, and I have been using it happily since I got it so I decided to list it anyways to see was there much interest in a product like this. But I wanted to make you aware of the issues so you can decide for yourself are they a concern for you.

• Screw holes for the screens are bad. The 5110 ones are not in a bad position, but they are too small to be useful. The OLED ones are not good at all! The OLEDs I have all have screw holes in slightly different positions, so I'm not sure they will ever be "right"
• Silkscreen has "10K" beside pull-up resistors for the i2c data lines, but it should be "4K7"
• Any future revisions will be a slightly larger PCB (1 or 2mm) as there is on trace that is too close to the edge for panelizing.

What comes with the kit

• 1no. D1 mini Screen Breakout Shield PCB
• 4no. 0805 4K7 SMD resistors (You only need 2, so 2 spares)
• 2no. 8P Female Headers (For 5110 screen)
• 2no. 4p Female Headers (For the OLED screens)

It DOES NOT include an D1 mini EPS8266 or screens!

Documentation and Set-up info

I created a post on my website that has some basic instructions for assembly and setup

Please note that I do not send any documentation with the board. There is a sticker with a link and QR code to the above URL. I feel it's wasteful to send on documentation when I can provide much better documentation on the web page than I could in a small sheet of paper.

Code Examples

Check out this Github repo for examples on how to use both types of screen, the comments on the top of the example sketches talk about what libraries to install to get them working.