node-red-contrib-ramp-thermostat 0.3.3

A Node-RED node that emulates a thermostat

npm install node-red-contrib-ramp-thermostat

ramp-thermostat

A Node-RED contrib-node that emulates a thermostat.

The ramp-thermostat controls an actuator depending on the current input temperature and the target temperature (setpoint).

Installation

Run the following command in your Node-RED user directory - typically ~/.node-red

$ npm install node-red-contrib-ramp-thermostat

Configuration

The target temperature is defined by a profile that provides the value depending on the current time 00:00-24:00. The profile consists of several points whose connections build a sequence of lines. The switching moment can be optimized by defining a gradient line like a ramp.

A profile has at least 2 points and should typically start at 00:00 and end at 24:00.

The hysteresis is used to prevent osciliation. The [+] value is added to the target and the [-] (absolute) value is subtracted from the target. Within this neutral zone no action accurs.

Usage

This node expects a numeric msg.payload containing the current temperature (number). The msg.topic should be empty or set to setCurrent. It will calculate the target temperature depending on msg.payload at the current time and output 3 values:

  • state (boolean)
  • current temperature (number)
  • target temperature (number)

The state (true/false) is used to control an actuator. The current and target temperature outputs can be wired e.g. into an ui_chart node.

Runtime settings

setTarget

msg.topic: setTarget
msg.payload: nn.n (number)

The target will be valid until a new target or a profile is set again or until node-red is restarted.

setProfile

msg.topic: setProfile
msg.payload: profile-name

The profile-name is one of the existing profiles that are configured in the ramp-thermostat node.

You can even define an input profile (JSON):

msg.topic: setProfile
msg.payload: {"name":"myGreatProfile","points":{"00:00":16.0,"08:00":20.0,"20:00":20.0,"24:00":16.0}}

Examples

ramp-thermostat2

ramp-thermostat1

The profile is defined using 6 points:

"time" : temp

"00:00": 18.0
"03:00": 18.0
"06:00": 20.5
"18:00": 20.5
"20:00": 18.0
"24:00": 18.0

Node Info

Version: 0.3.3
Updated 2 months, 2 weeks ago

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Nodes

  • ramp-thermostat
  • profile

Keywords

  • node-red
  • thermostat
  • profile
  • heating control
  • tmeperature control
  • energy saving
  • multtple heating zones
  • single room temperature control

Maintainers

  • cflurin