Using the original MCP23017 chip,  16-channel IO over I2C interface 16 IOs can be input or output Support to set pull-up resistor Support to enable Interrupt function IO drive capability up to 25mA I2C interface can support rate 100K 400K 1.7M The module I2C address line can be selected by itself. Up to eight different addresses can be applied to modules. Support arduino by libaries. https://elecena.pl/product/19643857/mcp23017-i2c-16ch-gpio-expander-board 2021-10-16 https://elecena.pl/product/19643857/mcp23017-i2c-16ch-gpio-expander-board 2024-04-30