node-red-contrib-trigger-empty v2.1.0

node-red-contrib-trigger-empty

node-red-contrib-trigger-empty directly send an "On" on the given topic, when it receives an "On", on any topic. Stores the "On" per topic and if all topics that send an "On" have send an "Off", sends an "Off" on the given topic. So basically a dynamic OR gate for topics. The actual "On" and "Off" value can be entered in Config. The send value is (case-insensitive) checked against the on or off value. The entered value is send.

Install

Run the following command in the root directory of your Node-RED install. Usually this is ~/.node-red

npm install node-red-contrib-trigger-empty

Using

The Node expects, or actually only uses the "ON" and "OFF" values given in the Configuration. When an message receives with the given On or Off payload, the topic is registered. If an On is received, it sends the On value. If the Off value is received for all registered topics (without receiving a new On value), a message with the Off value is send. In both cases the topic in the config is used as the topic for the message.

This can be used for an Under Floor Heating system. Turn the hot water loops on or off with thermal acuators connected to Tasmota-ted Sonoff 4channel switching units and use this node-red node to react on the stats of these Sonoffs, to turn on the pump of the UFH divider unit or the kettle. On when some loop wants hot water, off when no loop wants hot water.