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US$8.95
This module is the 16 way GPIO expander for the I2C interface, and built with the MCP23017.MCP23017 has a high-speed I2C interface which supports the I2C frequency of 100KHz, 400KHz and 1.7MHz. The chip has 3 address pins, which can be set up for 8 different addresses. So 8 modules can be connected through two I2C buses to achieve up to 128 IO extensions.