Overview




Make the SpaSitter  to perform web based monitoring of the water chemistry for swimming pools, hot tubs and other water bodies.  We have spent over a year testing the continued use of the pH and ORP (Oxidation Reduction Potential) probes in a hot tub environment.   They remain very accurate and react great to changes in water quality.

Its easy to use!  Drop the sensors into the water and put the electronics in a water proof project box.  Run a Ethernet line out to the monitor and plug it into a power supply.


  • Temperature monitoring -  A stainless steal encapsulated DS18B20 one wire temperature sensor for water proof temperature readings. 
  • pH / ORP  monitoring -  Determine when your hot tub needs chemicals before it gets green.  After heavy use the ORP level drops dramatically if there is not enough sanitation added to the water. 
  • Email or text message alerts -  Cosm.com has great options and add on features that alert you when your chosen parameter falls outside a selected value. 
  • Smart phone access - Add a Cosm widget to your smart phone and always have access your pool or spa conditions
  • High quality probes -  The kit comes with industrial grade pH and ORP probes.  Ideal for prolonged reading.  High polymer gel-filled design requires virtually no maintenance as there is no need to refill the reference chamber

2 comments:

  1. Could this be extended to control the temperature, automatically, or manually via your phone?

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  2. Very Cool .. Im interested in building one.. I love that its a DYI type of device and not a store bought solution..
    I do have a question.. do you know of or have any way to monitor the Hot tub Bromine levels in the case of a salt water spa?
    Ideally, I would look to monitor Temp, PH, Bromine, and ALkalinty levels... any help you can offer would be awesome. thanks

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