SEENGREAT MCP23017 IO Expander Module I2C Interface Expands 16 I/O Pins for Ardui/Stm32/Raspberry Pi Zero W WH 2B 3B 3B+ 4B, 3.3V and 5V Levels, 3-Digit DIP Switch

🔌 MCP23017 I2C GPIO Expander Board: SG IO E017 MCP23017 I2C GPIO Expander Board adds 16 digital I/O pins through the I2C interface, helping users expand GPIO resources while reducing pin occupation on the main controller. ⚙️ 16-Bit IO Expansion Module for Development: This 16-bit IO Expansion Module is suitable for input testing, output testing and interrupt testing, making it useful for GPIO extension, signal control, LED output, key input and sensor interface experiments. 🧩 3.3V/5V Logic Level Compatible: The MCP23017 GPIO Expander Module supports both 3.3V and 5V working levels, suitable for compatible with Raspberry Pi Zero/Zero W/Zero WH/2B/3B/3B+/4B, compatible with Arduino and STM32 boards. 🔗 PH2.0 Interface and 2.54mm Header Pads: This I2C IO Expansion Board includes a PH2.0 connector and reserved 2.54mm spacing pads, making it easy to connect with jumper wires, breadboards, custom PCBs and external development boards. 🎛️ DIP Switch Address Setting with Demo Codes: Onboard 3-digit DIP switch allows convenient I2C address configuration, while open-source C and Python demo codes for Raspberry Pi, for Arduino and STM32 help users quickly start GPIO testing and secondary development.