Hi,
Why are you using a Ameba RTL8195A board, when the Dissolved Oxygen Circuit unit has I2C?
There is even sample code and circuit fritzy on how to connect and get readings directly from it.
All from the link you provided.!!!
[http://www.atlas-scientific.com/product_pages/circuits/ezo_do.html](http://"http://" http://www.atlas-scientific.com/product_pages/circuits/ezo_do.html"")
Tom... :o :o :o