node-red-contrib-light-scheduler/lib/isitdark.js

Light Scheduler is a node-red node that provides a weekly schedule, and is mainly focused on controlling light in home automation scenarios.

var SunCalc = require('suncalc')

module.exports = {
  isItDark: node => {
    if (!node.settings || !node.settings.latitude || !node.settings.longitude) {
      node.warn(
        'Longitude and Latitude not configured properly, unable to take sun position into calculation!'
      )
      return true
    }

    var th = node.sunElevationThreshold ? node.sunElevationThreshold : 6

    var ts_now = new Date()
    var sunPos = SunCalc.getPosition(
      ts_now,
      node.settings.latitude,
      node.settings.longitude
    )
    var sunDeg = (sunPos.altitude * 180) / Math.PI

    return sunDeg < th
  },
  getElevation: node => {
    if (!node.settings || !node.settings.latitude || !node.settings.longitude)
      return 0

    var ts_now = new Date()
    var sunPos = SunCalc.getPosition(
      ts_now,
      node.settings.latitude,
      node.settings.longitude
    )
    return (sunPos.altitude * 180) / Math.PI
  },
}