Change variable type?

General
1

Hi,

I have some formula nodes which work out temperatures from incoming mqtt messages, in the node they say var temp1, var temp 2 etc, my question is can i change the var to global. so that the information can be harvested to create a file with current temperatures ?

Thanks
Stuart

2

you can store your values in global or flow context using a change node.

function:calc temp --> change:set global.temp to the value of msg.payload

You can also do it directly in a function node using global.set("name", value)

At some later timed event, you can then grab the value from global context

inject:every-hour --> change:set msg.payload to value of global.temp --> DB node (or file node or whatever)

Context is covered in the recommend playlist: Node-RED Essentials. The videos are done by the developers of node-red. They're nice & short and to the point. You will understand a whole lot more in about 1 hour. A small investment for a lot of gain.

1 Like
3

Hi Steve,
Thanks for this I will look at the videos tonight

Stuart