precipitation-irrigation.js

// With this script you can stop or limit watering your garden according to the rain
// that has fallen in the last 24 hours
// You can use any Shelly Plus 1/Pro1 ot Pro2 to control your irrigation system
// Dont forger to add AutoOFF for max Irrigation time and set a Schedule which start irrigation in device webUI.
// Configure Accuweather APIKEY and end points
let CONFIG = {
  accuWeatherAPIKEY: "YourACCUWEATHERKeyGoesHere",
  weatherCurrentEndpoint:
    "http://dataservice.accuweather.com/currentconditions/v1/",
  switchId: 0,
  // turn off, if rain in the last 24h was > 4.5mm
  rainMmValue: 4.5,
  //  List of locations
  locations: {
    Sofia: 51097,
    Test: 318900,
  },
};
// Choose which location
let here = "Sofia";
let location_id = CONFIG.locations[here];

function getWeatherURLForLocation(location_name) {
  return (
    CONFIG.weatherCurrentEndpoint +
    JSON.stringify(CONFIG.locations[location_name]) +
    "?apikey=" +
    CONFIG.accuWeatherAPIKEY +
    "&details=true"
  );
}

// This function read rain value in last 24h
function ReadRainHistory() {
  print("Check and Decide");
  Shelly.call(
    "http.get",
    { url: getWeatherURLForLocation(here) },
    function (response, error_code, error_message) {
      if (error_code !== 0) {
        // HTTP call to error service failed
        // TODO: retry logic
        return;
      }
      let weatherData = JSON.parse(response.body);
      let RainValue =
        weatherData[0].PrecipitationSummary.Past24Hours.Metric.Value;
      print("RainValue", RainValue);
      decideIfToIrrigate(RainValue);
    }
  );
}

// This function check are the rain in enought and switch off the valve
function decideIfToIrrigate(RainValue) {
  print(here, " Rain Last 24h - ", RainValue, " mm ");
  if (RainValue > CONFIG.rainMmValue) {
    //        Can be use to caluculate irrigration time base of amount the Rain last 24h
    //        let seconds_to_irrigate = (10 - RainValue) * 30;
    //        Shelly.call("Switch.Set", {"id": CONFIG.switchId, "on": true, "toggle_after": seconds_to_irrigate});
    Shelly.call("Switch.Set", { id: CONFIG.switchId, on: false }); // Disable if you calculate irrigration time
    print("Irrigration not needed");
  }
}

Shelly.addStatusHandler(function (e) {
  if (e.component === "switch:" + JSON.stringify(CONFIG.switchId)) {
    if (e.delta.output === true) {
      print("Switch is on, triggered source:", e.delta.source);
      ReadRainHistory();
    }
  }
});