I2c i o port expander arduino lcd - Rods Electronics Projects: Extremely simple I/O port
Basically what this does is to allow the master Arduino to access the remote's IO I2C io expander O port expansion using two arduinos and I2C.
The I2C port expander shield adds 16 digital outs to the arduino. Using the I2C bus means you save 14 pins. Each pin is capable of sinking 20ma of current. No PWM.
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The GPIO Expander Keypad and LCD Demo Board is designed to inputoutput functionality of the MCP (I2C IO Port Expander.
I2C port expander driving an LCD screen, Adventures with the MCP I2C port expander. as documented.
Components Parts IC Transistors MCP i2c 16 inputoutput port expander. O pins! We used this chip in our RGB LCD Keypad Arduino library.