Hydropi – Parts List


Here’s a list of all the materials that I used to make the Hydropi Pool Monitor.

The Hardware

Sensors Connected


The 4 items above can also be purchased in a variety of kits





Atlas Scientific Sensor Circuits

Atlas Scientific Sensors


These can also be bought as kits that include the circuit, BNC socket, sensor and calibration liquids all in one


 pH Kit


 Electrical Conductivity (EC) Kit


 Oxidation Reduction Potential (ORP) Kit

Atlas Scientific Temperature KitTemperature Kit


Atlas Scientific’s documentation states that their pH, ORP and EC circuits will work with any off the shelf BNC probes, I haven’t tried connecting any other probes to the circuits so I can’t say whether they will work or not but if your budget doesn’t stretch to the Atlas probes the Neptune series of probes are cheaper and appear to have good reviews.



Note that some soldering may be required to add header pins to these circuit boards depending on how you decide to connect them to your Pi. Here are my recommendations of the best value temperature controlled soldering irons.


The 2 items above are now incorporated in one board providing both power isolation and sensor circuit mounting, this will free up a lot of breadboard space and also save you money, you will need one for each sensor you are connecting.


Electronic Components



AC Power


Working with AC current is Dangerous, Please exercise extreme caution and preferably consult a professional to make any high voltage connections. Always disconnect from the mains when not in use and mount in a secure sealed plastic container.


  • 4 Way relay module
  • Surface Mount AC power socket (Country specific, required to plug in the Pi power supply)


For the following 3 items I basically bought one of these and broke it down to use it’s parts, I’m sure that something similar is available in most countries with the required socket type.


When it comes to AC power the required items are quite country specific so I have only placed links as examples, you will need to do your own research to find the appropriate parts for your project,  and again if you are not use to working with AC power then please get the advice of a professional.





Tools (Optional)






These are all the items that I used to create this project, obviously there are other possible arrangements, if you have thought’s feel free to leave a comment below.





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