I2c Make it Simple – Part 2
This video explains about I2C, with an example of using the I2C extender chip number PCF8574
This extender is used also in Arduino LCD with buttons that is sold on the net
This section shows how the circuit is working with Arduino Mega 2560, also note that:
1. The chip address (A0=A1=A2=0) is 0x20H
2. The Led should be tied to Pull up resistors
3. Pin number 7 is not connected to header
The link for the extender is here: I2C extender Ports on Ebay
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