Early in 2011 I became fascinated by the open source hardware movement, and saw the potential for new micro controller platforms to replace expensive commercial sensor units with cheap & cheerful DIY equivalents. So this blog is a record of my attempt to build an underwater flow sensor using an Arduino based data logger. My goal for this project is to build a submersible data logger for research in flooded cave systems that costs less than $300 each, and runs for a year on regular AA batteries.
Site Link: http://edwardmallon.wordpress.com/
The Arduino is an off the shelf Tiny duino, and the code was just cobbled together from the usual sources on the web, so I don't take any credit there. But I am quite happy with the o-ring underwater housing made from PVC plumbing, as it is very robust, even for a beta unit. And I am sure that many other groups who need a quick waterproof housing could put together the rubber end cap design I came up with in just a few minutes, hopefully saving themselves a few dollars in the process.
Once the basic data logger passes the current long term deployment testing, I will be adding many more water quality sensors to the units such as temperature, conductivity, and pressure. I will post progress there as I go along, and I look forward to insights from other collaborators, now that the project has been put online.