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These ELECFREAKS IIC OLED Module are small, but very readable due to the high contrast of an OLED display. This OLED display is made of 128x64 individual white OLED pixels, each one is turned on or off by the controller chip. Because the display makes its own light, no backlight is required. This reduces the power required to run the OLED and is why the OLED display has such high contrast; we really like this miniature OLED module for its crispness!
The OLED Module itself requires a 3.3V power supply and 3.3V logic levels for communication, but we include a 3.3V regulator and all pins are fully level-shifted so you can use it with 5V devices!