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 is 240 MHz, with computing performance up to 600 DMIPS. Built-in 520 KB SRAM. Supports UART, SPI, PWM, ADC, and other interfaces. Includes OpenOCD debugging support. Offers 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 for one-click network configuration. Compatible with standard AT commands. Supports local serial port firmware upgrade and remote firmware upgrade. Specifications: Micro-USB interface. Color: Black. Material: PCB + PVC. Package includes: 1 x ESP32 Development Board. Other accessories are not included. Note: Lighting conditions and screen variations may cause slight color differences between the image and the actual product. Measurement tolerance: ±1–3 cm.