Thanks Travis. The more I think about it, this will actually get quite complicated using Photons.
It may be easier to read the Flow Meter Output directly with an XBee (I/O sampling change detect) and aggregate the readings from all 9 XBees at an internet connected gateway (Cellular or WiFi).
Then have each XBee drive it’s relay (change a Pin High/Low) using an API command from the Gateway.
All 9 Flow Meter Xbee’s would be configured the same in XCTU, and you only maintain/modify your logic on the one Photon/Electron/Boron Gateway.
@Travis, do you have a relay board w/ XBee socket? I believe that was/is a major part of NCD, I’m not sure?
@dserrano, what Load will the Relay Drive, and @ what Voltage?
Your power budget (battery+Solar) will need to account for the Flow Meter, XBee, Relay Load, etc.