last updated: 2022-09-09
I had some spare monochrome OLED displays from an old project. OLED display are are getting cheaper. They need less power, are brighter and have a greater temperature range then LCDs. And you can never have enough monitors :).
The displays are used to show MQTT data from my new Energy Storage System (ESS) from Victron (3 phase 24 kVA). More infos soon on http://www.prosumer.lu.
The displays are 128x64 monochrome display from Newhaven with 2.7' screen. They can by found at
The display can be used in parallel mode or over SPI. As I needed I2C for 4 displays, I'm using my modified PCBs from the old project. More infos on this page:
On one display (OLED3) the first lines are not working, so I don't use this lines :).
The board was designed in Kicad. The schematic is already changed, but the PCB has still to be modified in Kicad.
I used the parallel to I2C board from the GTK281 PCB with the following changes:
As I needed 4 different I2C addresses, I had to modify the pin connections A0-A2 (all connected to GND) for 3 boards. So I got the addresses 0x20, 0x21, 0x22 and 0x23.
To install the library download
SSD1322_I2C.zip, from the git page and click in Arduino IDE
Sketch > Include Library > Add .ZIP Library....
The housing is drawn in FreeCAD. The stl files are on github.