Remove the jumper and connect an external

This comprehensive manual covers the board's technical specifications, layout, jumpers, and practical wiring examples. 1. Technical Specifications

This interface is extremely useful for connecting I2C‑based devices such as OLED displays, real‑time clocks (RTC), temperature/humidity sensors (like the BME280), or port expanders. Using I2C, you can control multiple devices using only two data lines.