OpenSprinkler › Forums › Hardware Questions › OpenSprinkler Pi (OSPi) › Does OSPi system have a way to detect open/close states of DIY sensor? › Reply To: Does OSPi system have a way to detect open/close states of DIY sensor?
You ought to be able to use any of the unused pins (see the user manual) for your pressure sensor. You could then have software running on the Pi independent of OpenSprinkler that would monitor the pressure. If the pressure dropped to low, you could interact with OpenSprinkler via the API to stop the program. Your software could also notify you through whatever means you want it to.