The board uses I2C to connect to the OLED display via the SDA (D21/GPIO21) and SCL (D22/GPIO22) pins. The I2C address of the OLED display is 0x3C. Module body: ESP-WROOM-32 module. ESP32 0.96-inch OLED board has all the functions of the traditional ESP32 DevKit V1 module, with identical peripheral ports. It seamlessly integrates a 0.96-inch OLED display with a resolution of 128x64 and built-in driver, compatible with the I2C interface. The module is based on the ESP-WROOM-32, an 802.11b/g/n Wi-Fi + Bluetooth module. It features a low-power dual-core 32-bit CPU, usable as an application processor; maximum clock frequency of 240 MHz, computing power up to 600 DMIPS; built-in 520 KB SRAM; supports UART, SPI, PWM, ADC, and other interfaces; supports OpenOCD debugging; supports multiple sleep modes, with deep-sleep current as low as 6.5 µA; embedded LwIP and FreeRTOS; supports STA, AP, and STA+AP modes; supports Smart Config and AirKiss one-click network configuration; supports standard AT commands; supports local serial port firmware upgrade and remote firmware upgrade. Specifications: - Interface: Micro-USB - Color: Black - Material: PCB + PVC - Package Contents: 1 x ESP32 Development Board Note: The actual product color may vary slightly due to lighting conditions and screen settings. Measurement tolerance: ±1–3 cm.