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).
Run the following command in your Node-RED user directory - typically ~/.node-red
$ npm install node-red-contrib-ramp-thermostat
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.
This node expects a numeric msg.payload containing the current temperature. It will calculate the target temperature depending on msg.payload at the current time and output 3 values:
The state (true/false) is used to control an actuator. The current and target temperature outputs can be wired e.g. into a ui_chart node.
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}}
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