Switching power with the Arduino over a I2C connected PCF8574

1 Goal

This little project wants do demonstrate how it is possible to switch a great number of lines with one single Arduino controller. It uses the PCF8574P chip. It is actually a reimplementation of this project:

• http://circuitsforbeginners.blogspot.com/2009/11/project-rolling-dice-expanding-arduino.html

2 References

• http://www.arduino.cc/en/Reference/Wire The WIRING "Wire" library
• http://www.neufeld.newton.ks.us/electronics/?p=241 A project in which the workings of the I2C protocol are well described
• www.nxp.com/documents/data_sheet/PCF8574.pdf The Datasheet for the PCF8574

3 The Scheme