I just added a page to the blog introducing my major side project. I've built an Arduino based flow sensor that monitors my irrigation water usage. (It also keeps an eye on my automatic pool filler.) It mails me graphs of water usage every morning so that I can easily see if a sprinkler head has been broken off, thereby saving me money and worry. It also emails me if flow stays on for longer than a set time (in case I've forgotten to turn off water filling the pool). I can check the flow rate in real time from a web page.
I haven't yet packaged up the source, but I'll do that soon. Check it out and leave me comments.
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