I want to log the water pressure coming into my house only when no one is using any taps in the house. The pressure is never more than 45PSI. The main water line coming into house is 15mm. I had an IP camera looking at the gauge for some time now. I can easily install something inside the pipe, I do not want to reduce the pressure "significantly" by installing anything into the pipes. I bought and learn with Arduino Mega.
Looking on the web I thought I need the following: a. Water pressure sensor. I want to buy this: http://sensing.honeywell.com/index.cfm?ci_id=140301&la_id=1&pr_id=145908
b. Water flow sensor recommend in this forum and on web: http://www.seeedstudio.com/depot/water-flow-sensor-p-635.html?cPath=6&zenid=594b89701c7a2015a13064b67aed4f44
I hope to only record pressure when the flow meter indicate zero flow.
Your advise will be much appreciated. I can buy digital data loggers It is very expensive +- UK £400. This will not allow me to learn anything.