Overview Of pH and ORP Arduino Sensor

Make the SpaSitter 2.0, an open source hardware project based on the Arduino, to perform web based monitoring of the water chemistry for swimming pools, hot tubs, spas 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 chemistry.  These high quality probes are expensive, but will out last any cheep commercial monitor, and they can be reconditions and calibrated!

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 monitoring / ORP  monitoring -  Determine when your hot tub or swimming pool needs chemicals before it gets green or cloudy.  After heavy use the ORP level drops dramatically if there is not enough sanitation added to the water.  Optimum readings should be around 7.6 pH and 700 mV. 
• 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.