I love New Haven Displays, especially the 4x20 character slim OLED displays for small electronic projects. Especially the NHD-0420CW which is available in blue, green, red, or yellow.

These displays can be interfaced by a number of protocols, parallel, SPI, and I2C. I2C is the easiest for a small micro controller, but the interface connection on the display has twenty pins, and the selection of I2C requires the grounding or pull up of 16 of the signals.

Bringing all twenty signals back to your main circuit board just to tie them to ground or Vcc is a pain. So, I created a small adapter board that does the work. You just need to wire 4 signals to your Arduino or other controller: Vcc, ground, SCL, and SDA. A reset signal is optional, or, you can jump it high (no reset) on the adapter board.

You will need to supply your own headers to complete the project. The picture shown is an example of how I finished it. Also, the display is not included, this is also provided as an example.