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The class library that will be used in this section and that needs to be imported is:

  • MCP23008_Keypad (Author: Grant Phillips, Apr 2016, search: "mcp23008_keypad") - Class library for a 4x4 keypad connected to a MCP23008 I2C IO Expander.

The following example programs will demonstrate the principles of using a 4x4 keypad connected to a MCP23008 I2C IO Expander using the MCP23008_Keypad class library: