node-red-contrib-sunpos

A Node-RED node to calculate the position of the sun at a given location.

Install

Run the following command in the root directory of your Node-RED install

npm install node-red-contrib-sunpos

Usage

This node calculates the position of the sun at a given location. It is configured with the following properties:

• lat: latitude of the location
• lon: longitude of the location
• start: time of day that constitutes the start of daylight hours
• startOffset: offset to be applied for start of daylight hours, a negative value brings the start forward, a positive value delays
• end: time of day that constitutes the end of daylight hours
• endOffset: offset to be applied for end of daylight hours

This node can optionally receive a time via an input message containing msg.time conforming to Javascript Date object, otherwise it will use the current time.

This node emits a msg.payload with the following properties:

• startTime: time of day that constitutes the start of daylight hours (inclusive of offset)
• endTime: time of day that constitutes the end of daylight hours (inclusive of offset)
• sunInSky: boolean value indicating whether it is currently considered daylight hours
• altitude: altitude of the sun above the horizon in degrees
• azimuth: azimuth of the sun in degrees, where 0 is North
• altitudeRadians: altitude of the sun above the horizon in radians
• azimuthRadians: azimuth of the sun in radians, where 0 is South, a positive value is in the west and negative value in the east

The node also sets the following msg properties:

• location: with the coordinates of the location
• sunTimes: an object containing various sunlight times
• topic: to "sun"

All times in msg.payload are milliseconds since midnight Jan 1 1970.

The node also reports its status within the Node-RED flow editor, using colour to indicate whether it is currently considered daylight hours.

Credit

This Node is based on, and has used code from, another node-RED Node called suncalc published by dceejay