Pool/Hot Tub Monitoring and Data Collection

Pools and hot tubs, although enjoyable, require monitoring and maintenance to keep the water clean and clear. [bhuebner] didn’t like having to constantly testing his hot tub’s vitals using test strips and water test kits. In an effort to autonomously monitor his hot tub’s water, he came up with a project he’s calling SpaSitter that records and tracks water quality indicators.

spa sitter The hardware is based on a Nanode (think Arduino with on-board Ethernet). Three sensors are connected to the Nanode and placed in his hot tub’s water.  The sensors measure pH, ORP and Temperature. That data is then uploaded to xively.com where the data is not just stored, but tracked over time and displayed in graph-form. Checking the vitals on your phone can also get a bit tedious so [bhuebner] set up an email notification if one of the measured data streams go outside of a predetermined range. He still has to add chemicals manually and hopes to see some automation added to the next project revision.

[bhuebner] made his code available and also posted detailed instructions, including how to calibrate the sensors, for anyone wanting to do the same thing.

Itemizing Water Consumption At Home

For a while now [Florian] has wanted to itemize his water usage at home to keep better track of where his water bill is coming from — and to help him develop water conscious habits. He’s not done yet, but has had a pretty good start.

Faucet Sensor

The problem with measuring the water usage of everything in your house is that the plumbing involved to install sensors is a rather big job — so instead he assumed constant flow in some places and just used sensors on the valves to determine how long the valve was open for, which gives him a fairly accurate number for water usage.

On the right is his kitchen faucet which features a super quick arcade button hack to keep track of it being on or off.

The toilet was a bit trickier. He ended up designing a 3D printed mount attached to the lever on the inside of the tank — it’s pretty universal so he’s included the .STL files on his website if anyone wants to try implementing this system.

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