WatangTech CAT9555 IO Expander Module - 16 bit Parallel GPIO Expander, Board I2C Interface, SMBus I/O Port, with Pre-soldered Header, Suitable for Arduino/RPi Project Development
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0.30 kg
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- This CAT9555-based I/O expansion module extends 16-bit parallel GPIO ports through I2C/SMBus, designed for integration with popular development boards: For Raspberry Pi: WiringPi/Python libraries, auto-detect via i2cdetect. Compatible with Arduino UNO: Plug-and-play via SDA/SCL pins, with interrupt-driven input monitoring. Fit for STM32F103: UART debugging support, Keil project files provided.
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16-Bit I/O Expansion: Adds 16 programmable GPIO ports via I2C bus (400kHz), ideal for sensors, LEDs, buttons, and fan control. Universal Compatibility: Works with Raspberry Pi (BCM2835), Arduino UNO R3 (ATmega328P), and STM32F103 boards. Pinout guides included. Advanced Interrupt Handling: Active-low interrupt output triggers real-time input change alerts, reducing CPU polling. Plug & Play: 3.3V/5V dual voltage support. Built-in polarity inversion registers and power-on reset. Multi-Platform Support: Includes C/Python code for Raspberry Pi, Arduino IDE examples, and Keil uVision5 project for STM32.