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By trackerj
#66158 start with a I2C scan, to check your wiring and find the proper OLED I2C address.
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By QuickFix
#66168 It's a really nice OLED for a great price (they're about $2,50 on AliExpress), though it's not 128*128 but 128*64 pixels. :idea:

I2C address is on 0x3c (not 0x78 like the PCB says) and you can use any good SD1306-library (for instance the one from AdaFruit).