I²C OLED Backpack Board for Newhaven OLED Displays

i2c OLED Backpack with Seeeduino

Description

OLEDs are my favorites types of displays because they are bright, easy to read in moderate sunlight, and relatively low in power consumption. Newhaven makes a wide variety of OLED character displays. They offer 16×2, 20×2, and 20×4 (columns by rows) sizes and they come in many colors (blue, green, yellow, and red). They operate on 3.3 or 5 volts, so they are ideal for a most embedded projects.

You’ll need to choose a Newhaven OLED module that uses the US2066 controller chip which has I²C built in (see links below). This project consists of a board that sits on the back of the display, and provides two Grove type I²C connectors and one 4 pin connector (with .1 inch spacing) for easy connection to a microcontroller. This board also has the I²C pullup resistors (enabled with solder jumpers), a jumper to select the I²C address, and a jumper to select the supply voltage. The display and backpack board will operate on 3.3 or 5 volts, which allows it to work with the most microcontrollers.

You can purchase the Newhaven OLEDs direct from Newhaven or from Mouser.

To make it easy to use this display, I wrote a software library for the Arduino and Particle microcontrollers. In this library there are over 20 functions, such as clear(), moveCursor(), createChar() (for making custom characters), and write() (for using the Print function).

Here are some related projects and posts that might also interest you.

Files

The schematic and pcb layout files (Eagle and pdf) are available at this Github repository.

Parts

This project does not require many parts, and most are available from Mouser. Bare PC Boards are available from OSH Park.

Qty Part Value Package Vendor Part Number
1 C1 .1uF 0805 Mouser.com 80-C0805C104M5R
1 C2 10uF 0805 Mouser.com 647-F921A106MPA
2 J1,J2 4 pin Grove SMD 90 Seeedstudio.com 320110032
1 J3 20 pins .1 Header Pins Mouser.com 855-M20-9992045
1 J4 4 pins .1 Header Pins Mouser.com 855-M20-9990445
2 R1,R2 4.75K 0805 Mouser.com 71-CRCW0805-4.75K-E3
2 R3,R4 10K 0805 Mouser.com 71-CRCW0805-10K-E3
1 PC Board OSH Park Order Link

J4 does not need to be populated if you are using the Grove type connector to connect to the microcontroller. J4 can be used for other type connectors that use the standard .1 inch spacing.

You can purchase the Newhaven OLEDs direct from Newhaven or from Mouser.

Bare pc boards are available from OSH Park.

Assembly

i2c oled backpack with display

As you probably noticed, this board uses surface mount components, so you will need some skill in dealing with these small parts. Sparkfun has an excellent series of tutorials if you want to brush up your knowledge on soldering these small parts..

Hookup

i2c oled backpack with display

Solder the backpack board to the OLED display module using a 20 pin strip header (.1 inch pin spacing).

Using a 4 pin Grove type cable, attach the backpack board to a microcontroller that has a I²C Grove type connector on it. This will power the display and connect the SDA and SCL lines to the microcontroller.

Jumpers

There are four solder jumpers near the center of the backpack board. To “close” a jumper, carefully solder a bridge across the two pads using a small amount of solder.

If you solder across SJ1 and SJ2 you can enable pull up resistors on the signals SCL and SDA (respectively). At least one pull up resistor is required on these lines somewhere on your various hardware boards.

SJ3 is used to set the I²C address of the board.

  • If SJ3 is closed (shorted) the I²C address is 3C hex.
  • If SJ3 is open (unshorted) the I²C address is 3D hex.

Software

For Arduino and Particle users, the I2cCharDisplay library provides functions the take advantage of the features of this display. An included demo program shows the usage of the functions. These links give the details.

Miscellaneous

Seeeduino Version 4.2 is an Arduino compatible board with Grove I²C connectors on it and is available from Mouser, Amazon and Seeedstudio.

Seeedstudio makes the Particle Photon Base Shield which is a board that allows you to plug in a Particle Photon module. It has the Grove type connectors on it for easy connection to this backpack board.

Grove cables in various lengths are available from Seeedstudio, Mouser, Amazon, and Digikey.



2 comments on “I²C OLED Backpack Board for Newhaven OLED Displays
  1. Brian Beardmore says:

    Awesome Work on this tutorial!!! One questionDo I have to have the backpack board if I have the NewHaven NHD-0420CW-AG3 … I thought this NewHaven OLED already had I2C.

  2. gary@wht.io says:

    Thanks Brian. Yes, the NewHaven displays do indeed have i2c build in and a backback board is not required. This backpack board adds i2c connectors and jumpers for i2c addressing just to make it easier to use the NewHaven board.

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