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Brief your question little bit, if you want to measure water flow you need to learn working principle of solenoid valve and sensor unit if you are measuring water level or something, then you have to learn protocol unit, which protocol you are going to use there, for example if water flow is there you gonna get message in the sense you need to learn some GSM ...


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I need to have more detail from your question. But, I think you can easily use an Arduino or Mbed to monitor the water meters and communicate back to a server on your LAN. If the sensors will have external power (no battery), then you can connect to a wi-fi network with this type of board. If you have batteries only, then choose a low-power network like Lora....


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