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This project is part my robot project called [http://ymoona.com/wiki/index.php/Maggie Maggie]. Maggie used analog infrared distance sensors from sharp: GP2D12. To make it also possible drive some leds from the same module I could not use a standard I2C A/D converter. So I build my own universal Input Output Module (IOM) with I2C. The main features of this project are:
* Configurable address (multiple devices on the same bus)
* 8 Programmable IO pins
* Programmable via I2C
* All pins can be programmed to be digital input 
* All pins can be programmed to be digital output
* 4 pins can be programmed to be analog input

= Hardware =
== Schematics ==
[[Image:I2C_Input_Output_Module_schema.jpg|right|thumb|400px|schema]]
The schema is build around a standard micro controller from Microchip. For the microntroller I used a PIC16F88. This controller has a few features why I've choosing this one:
* Internal RC oscilator
* Low cost
* I2C support
* Available for me in SMD

==PCB==
The PCB is a professional made one. I designed it myself and let manufacture in China. This way I get nice looking PCB without high costs. 
<gallery>
Image:I2C_Input_Output_Module_top.JPG
Image:I2C_Input_Output_Module_bottom.JPG
</gallery>

= software =

I have uploaded the source file to this wiki. [http://www.ymoona.com/wiki/images/b/bd/I2C_Input_Output_Module_IOM.c here] I've also uploaded a compiled version of this software: [http://www.ymoona.com/wiki/index.php/Image:I2C_Input_Output_Module_HEX.zip here]

== protocol decription ==
protocol is to be described
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If you have any questions please send me a email.