last updated: 2022-09-09
OLED displays are getting cheaper. They need less power, are brighter and have a greater temperature range then LCDs. At mouser I found an 128x64 monochrome display from Newhaven with 2.7' to possibly replace the GTK-281.
The display can be used in parallel mode or over SPI. As I needed I2C I modified the parallel to I2C board from the GTK281 PCB to use it for the new display.
The display is working like a charm, but it is quite slow.
Themqttoledmon_1 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:
To install the library download
SSD1322_I2C.zip, from the git page and click in Arduino IDE
Sketch > Include Library > Add .ZIP Library....
The library has two examples, the second to set and test the onboard RTC.