Signal K•2mo ago

barnaclebill - Can anyone help me configure a n...

Can anyone help me configure a node-red flow? I am measuring a fuel tank sensor, which sends a percentage, but I can't figure out how to configure the pathvalue node.

25 Replies

Scott Bender•2mo ago

Export and paste your nodes here, then I can help.

barnaclebillOP•2mo ago

Output from "smooth" is a numeric value...I'm stuck trying to figure out how to translate that payload into the value to be submitted at the path I specify.

flows.json

Scott Bender•2mo ago

did youi give me all your flows?

barnaclebillOP•2mo ago

Yes. I only have one.

Scott Bender•2mo ago

so, I'm not sure I understand what the issues is you just to convert to a ratio? You can use a change node for that

barnaclebillOP•2mo ago

If I connect "smooth" to "fuel tank" and deploy, I get an error "The workspace contains some nodes that are not properly configured:"

Scott Bender•2mo ago

it does look like the send-path node is not using the entered path and you do need to convert to a ratio, so add a change node like this

Scott Bender•2mo ago

(of course, change the math and path) let me make a real example for you...

[{"id":"81ee81a2c1303be9","type":"debug","z":"50961b374e1aefc7","name":"debug 1","active":true,"tosidebar":true,"console":false,"tostatus":false,"complete":"payload","targetType":"msg","statusVal":"","statusType":"auto","x":880,"y":260,"wires":[]},{"id":"afeee15b412ed126","type":"inject","z":"50961b374e1aefc7","name":"","props":[{"p":"payload"},{"p":"topic","vt":"str"}],"repeat":"10","crontab":"","once":false,"onceDelay":0.1,"topic":"","payload":"54","payloadType":"num","x":550,"y":140,"wires":[["f1108a8da68fb223"]]},{"id":"ea4c67d59a1899c5","type":"signalk-send-pathvalue","z":"50961b374e1aefc7","name":"fuel tank","path":"","source":"","meta":"","x":1000,"y":180,"wires":[]},{"id":"f1108a8da68fb223","type":"change","z":"50961b374e1aefc7","name":"","rules":[{"t":"set","p":"topic","pt":"msg","to":"tanks.fuel.0.currentLevel","tot":"str"},{"t":"set","p":"payload","pt":"msg","to":"payload/100","tot":"jsonata"}],"action":"","property":"","from":"","to":"","reg":false,"x":740,"y":200,"wires":[["ea4c67d59a1899c5","81ee81a2c1303be9"]]}]

[{"id":"81ee81a2c1303be9","type":"debug","z":"50961b374e1aefc7","name":"debug 1","active":true,"tosidebar":true,"console":false,"tostatus":false,"complete":"payload","targetType":"msg","statusVal":"","statusType":"auto","x":880,"y":260,"wires":[]},{"id":"afeee15b412ed126","type":"inject","z":"50961b374e1aefc7","name":"","props":[{"p":"payload"},{"p":"topic","vt":"str"}],"repeat":"10","crontab":"","once":false,"onceDelay":0.1,"topic":"","payload":"54","payloadType":"num","x":550,"y":140,"wires":[["f1108a8da68fb223"]]},{"id":"ea4c67d59a1899c5","type":"signalk-send-pathvalue","z":"50961b374e1aefc7","name":"fuel tank","path":"","source":"","meta":"","x":1000,"y":180,"wires":[]},{"id":"f1108a8da68fb223","type":"change","z":"50961b374e1aefc7","name":"","rules":[{"t":"set","p":"topic","pt":"msg","to":"tanks.fuel.0.currentLevel","tot":"str"},{"t":"set","p":"payload","pt":"msg","to":"payload/100","tot":"jsonata"}],"action":"","property":"","from":"","to":"","reg":false,"x":740,"y":200,"wires":[["ea4c67d59a1899c5","81ee81a2c1303be9"]]}]

barnaclebillOP•2mo ago

OK so I divided/100 in the "ads-to-fuel-level" node, so I should have the ratio correct now. But (I realize this is kind of idiotic)...I can't figure out how to get Rules in the UI.

Scott Bender•2mo ago

Also note the proper path for a tank level in my example)

barnaclebillOP•2mo ago

(This is my first day with node-red 🙂

Scott Bender•2mo ago

delete the path you entered in the send-path-value node (there does look like I have a bug there) and use a change node to set the topic to the path you want to send which should probably be tanks.fuel.0.currentLevel

barnaclebillOP•2mo ago

I added a change node to set the topic, and the payload is the ratio, but I'm still getting the same error on deploy, so I must be doing something wrong.

barnaclebillOP•2mo ago

Scott Bender•2mo ago

Try deleting and recreating that send-path-value node Don’t change anything in it And I think if you hover over that red triangle, it will tell you what’s wrong

barnaclebillOP•2mo ago

Success!

barnaclebillOP•2mo ago