This article explains what I2C is, how it works, how devices are addressed, why pull-up resistors are needed, and how to use and troubleshoot I2C in projects.

A Raspberry Pi I2C tutorial using the Qwiic ecosystem. It shows required hardware, how to enable I2C, connect a BME680 sensor and SSD1306 OLED, install tools/libraries, scan devices with i2cdetect, and run a Python example that reads temperature via pigpio and displays it on the OLED.