I2C-Buffer (PCA9515A) is a compact and reliable I²C bus isolator and signal buffer designed to improve communication stability in complex or long-distance I²C systems.

This board separates the I²C bus into two isolated sections (A-side and B-side), reducing signal distortion and capacitive loading issues that often occur with multiple sensors or long cables. It supports both 3.3V and 5V logic levels, making it ideal for mixed-voltage environments.

Perfect for makers, embedded developers, and engineers who need clean and stable I²C communication in demanding setups.

Key Features:

• Based on PCA9515A I²C Bus Buffer IC
• Bi-directional level shifting (3.3V ↔ 5V)
• Bus isolation between A and B sides
• Compatible with STEMMA QT / Qwiic connectors
• Compact design for prototyping and integration

This open-source project is created and shared by Uğur Altınsoy to help the community build more reliable I²C systems.

🔗 GitHub: https://github.com/Deeplab-Studio/I2C-Buffer