This is an ESP32 development board with a built-in 128×64 pixels SSD1306 OLED display. The display communicates with the ESP32 via I2C communication protocol (GPIO5=SDA; GPIO4=SCL) – Guide for Arduino IDE and MicroPython.
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The SSD1306 OLED display uses I2C communication. It is made of 128 by 64 individual OLED pixels and no backlight is required. Learn how to use ESP32 with Built-in OLED on Arduino IDE or MicroPython. More OLED guides: