This is probably one of the stupidest questions asked here... but what is an I/O expansion board and what is it used for? Is it used for testing software? Or for connecting between different interfaces? I was told I will be working with an Arduino micro controller, joystick, lcd screen, servo, and…

What is an I/O Expansion Board?

Chagrin June 8, 2012, 8:56pm 5

The centipede shield is a good example of an I/O expander. It uses an I2C interface as AWOL described and MCP23017 chips like majenko described

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