Hi all! It's my first node red and I'm trying to make an mqtt arduino alarm.
I need help on how can I do something like this:
If door_open_topic="open" AND alarm_topic="armed" THEN do this and that...
Thanks for the help guys!
So I’m guessing you’ve realised that a node in node-RED has no memory of previous messages. There are several ways of getting the status of two messages together in Node-RED. One way is to use the join node the other way is to store one of the message values, see this part of the docs
Here is one example. Your conditions are set in a global variable. The payload only passes when both of them are true.
[{"id":"156b11a0.14c1ee","type":"inject","z":"1f481add.f1d5e5","name":"","topic":"","payload":"true","payloadType":"bool","repeat":"","crontab":"","once":false,"onceDelay":0.1,"x":130,"y":40,"wires":[["339345ba.ce389a"]]},{"id":"339345ba.ce389a","type":"change","z":"1f481add.f1d5e5","name":"","rules":[{"t":"set","p":"door_open_topic","pt":"global","to":"payload","tot":"msg"}],"action":"","property":"","from":"","to":"","reg":false,"x":340,"y":60,"wires":[[]]},{"id":"6418d271.0b747c","type":"inject","z":"1f481add.f1d5e5","name":"","topic":"","payload":"ALARM","payloadType":"str","repeat":"","crontab":"","once":false,"onceDelay":0.1,"x":130,"y":200,"wires":[["79abb755.831178"]]},{"id":"d43a1e7d.56035","type":"inject","z":"1f481add.f1d5e5","name":"","topic":"","payload":"false","payloadType":"bool","repeat":"","crontab":"","once":false,"onceDelay":0.1,"x":130,"y":80,"wires":[["339345ba.ce389a"]]},{"id":"e5555548.403698","type":"inject","z":"1f481add.f1d5e5","name":"","topic":"","payload":"true","payloadType":"bool","repeat":"","crontab":"","once":false,"onceDelay":0.1,"x":130,"y":120,"wires":[["c1d1b731.1ace88"]]},{"id":"c1d1b731.1ace88","type":"change","z":"1f481add.f1d5e5","name":"","rules":[{"t":"set","p":"alarm_topic","pt":"global","to":"payload","tot":"msg"}],"action":"","property":"","from":"","to":"","reg":false,"x":320,"y":140,"wires":[[]]},{"id":"1e77dcff.e8a703","type":"inject","z":"1f481add.f1d5e5","name":"","topic":"","payload":"false","payloadType":"bool","repeat":"","crontab":"","once":false,"onceDelay":0.1,"x":130,"y":160,"wires":[["c1d1b731.1ace88"]]},{"id":"79abb755.831178","type":"switch","z":"1f481add.f1d5e5","name":"","property":"door_open_topic","propertyType":"global","rules":[{"t":"true"}],"checkall":"true","repair":false,"outputs":1,"x":250,"y":200,"wires":[["7e5f9789.1993a8"]]},{"id":"7e5f9789.1993a8","type":"switch","z":"1f481add.f1d5e5","name":"","property":"alarm_topic","propertyType":"global","rules":[{"t":"true"}],"checkall":"true","repair":false,"outputs":1,"x":370,"y":200,"wires":[["acbc913e.ac345"]]},{"id":"acbc913e.ac345","type":"debug","z":"1f481add.f1d5e5","name":"","active":true,"tosidebar":true,"console":false,"tostatus":false,"complete":"true","x":490,"y":200,"wires":[]}]
If you'd like to check many conditions you should take a look at node-red-contrib-bool-gate
Made it!
Thank you so much!
