I would like to test if a sensor is working, my schematic I have is the following [image] what I intend is through a test function if the sensor 3 is working and showing a message saying ok, and when it is off to say no ok, the function I did was this: var test=msg.payload; if (test=== "OK"){ …

Your function node that generates the query is doing this: msg.topic= "INSERT INTO testebase VALUES ('"+new Date().toString()+"','"+msg.topic["sensor1"]+"','"+msg.topic["sensor2"]+"','"+msg.topic["sensor3"]+")"; It is trying to pull the sensor values out of msg.topic. but the are not under msg.top…

Best thing to do is to read a bit about basics first. https://nodered.org/docs/user-guide/messages

As the error says you have returned a string ("sensor not working"). You must always return a message (or nothing). Perhaps you want to put the error string into msg.payload and then return msg. I also see that if it is OK you return nothing, which means no message will be sent, which I suspect i…

I make this for testing the sensor 1 when it is at zero value and sensor 3 when it is at zero value: if(msg.payload[0]===0){ msg.payload = " Sensor 1 not ok"; } else if(msg.payload[1]===0){ msg.payload = " Sensor 2 is not ok"; } else if(msg.payload[2]===0){ msg.payload = " Sensor 3 is n…

If it is returning sensor 1 not ok then that means that msg.payload[0] is 0. If that is not what is happening then show us what is in the message going in by putting a debug node to show it and expanding it in the debug pane to show all the contents. [Edit] Note that if msg.payload[0] is zero the…

yes the msg.payload[0] is correct, I want is to run the Join array and detect the position of the array that is at zero and show the sensors that are at zero and in this case with sensor 1 and sensor 3 at zero only shows that the 1 is not ok 08/02/2019, 16:38:33node: Output of state of sensor …

the node of state function [{"id":"2778a415.504f8c","type":"function","z":"ebbf8292.d6fd4","name":"State of Sensor","func":"if(msg.payload[0]===0){\n msg.payload = " Sensor 1 not ok";\n}\nif(msg.payload[1]===0){\n msg.payload = " Sensor 2 is not ok";\n}\nif(msg.payload[2]===0){\n msg.paylo…

Select the set of nodes including the inject nodes so we can try it out. Then export it.

I assume from the function that you are joining the messages together into an array. The problem with that is, how do you know which element is which sensor? You cannot guarantee the order they will arrive at the node. Instead you can specify joining to a key/value pair. Make sure each message c…

The program show this: [ { "id": "8ee0a7b9.5a9af8", "type": "debug", "z": "ebbf8292.d6fd4", "name": "Output of function", "active": true, "tosidebar": true, "console": false, "tostatus": false, "complete": "true", "x": 740.1001243591309, "y": 26.200007438659668, "wires": [] }, { "id…

Test of a sensor

General

Colin 8 February 2019 17:01 7

Export the test flow by selecting the nodes and slicking Ctrl-E which will allow you to export to the clipboard, select Compact mode. Then you can paste it here for us to see exactly what you are doing. See this for how to format it so the forum formatting does not mess it up.

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Test of a sensor

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