( NOOB ) Numeric input as value for if else function

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Hello Community,

I previsouly want to excuse my self if this question was already answerd or discussed. But I searched since two days and try to solved it myself but with now succed.

Im new into this topic of programming or node-red, so maybe I also searched for the wrong keywords.

My aim is to switch some sockets based on temperature and humidity.

As Hardware i use:

Raspberry Pi 4
1x BME280
2x DHT11
1x 8-Relay Modul

I already have succed to control a gpio-port via humidity-data based on the DHT11 and to display these data on gauges and charts.

I use a simple if-else function:

if (msg.payload >= "50")
{
    msg.payload = "1";
}
else{
    msg.payload = "0";
}
return msg;

I now want to change the fix value "50" with an numeric-input, so i could adjust the "setpoint" using the UI.

My problem is that the numeric-input gives out the "value" into the msg.payload. I would like to change the msg.payload to something else like msg.setpoint1 and then use this to compare with the sensor-data.

I have tried serval methods but since I am brandnew to programming, I think I made basic false.

Could you please help me with this topic ?

Thanks in advance for your help!

BR,

Julian

Here my complete Flow up to now:

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2

Hi and welcome.

You can use a change node after the numeric input, set to move msg,payload to msg.setpoint.

when posting code it is good practice to post between backticks, i.e.
```
code
```
This makes the thread less messy and easier for someone to copy and past your code. Your posted flow has syntax errors due to not posting in code tags, if you want someone to look at it please repost.

3

Thanks a lot E1cid for your reply !

I've already have tried this. It works if I use it as a "seperat" flow.
But if I try to integrade it into my "complete" flow, it seems like the value "msg.setpoint1" couldn't get trough it all.
I always get a "undefined". As I said I do something basic wrong I guess.

I create a numeric input -> change node ( msg.payload set to msg.setpoint1 )

Now I change:

if(msg.payload >= msg.setpoint1)
{
    msg.payload = "1";
}
else{
    msg.payload = "0";
}
return msg;

than I connect like this numeric -> change -> function -> gpio

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4

You have this the wrong way around (many people trip up on this)

image

It reads set msg.payload to the value of msg.setpoint1

you need it to read set msg.setpoint1 to the value of msg.payload

5

Ok now i can see your flow, your msg payload and setpoint are not in the same message

so i suggest store your set point to flow context storage in the change node. Then in your function access it with
let setpoint1 = flow.get("setpoint1");
then remove the link from change node to function , as setpoint1 will be stored so no need for link.
eg.

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you can also add a defualt if setpoint has not be stored yet
let setpoint1 = flow.get("setpoint1") || 20;

6

Thanks again for the fast replay ! :star_struck:

Ok I've now change the change-node to set msg.setpoint1 to msg.payload.

Than I add to the function-node:

let setpoint1 = flow.get("setpoint1") || 20;

if(msg.payload >= "setpoint1")
{
    msg.payload = "1";
}
else{
    msg.payload = "0";
}
return msg;

If I now change the value to it still outputs '0' as msg.paylod. So it not respond on my changes, how could I check if the changes really effect into the function-node ?

7

show your change node please

8

"Festlegen" means "set" :sweat_smile:

Bildschirmfoto 2020-11-10 um 19.31.15
Bildschirmfoto 2020-11-10 um 19.31.151016×1268 35.5 KB

Bildschirmfoto 2020-11-10 um 19.34.49
Bildschirmfoto 2020-11-10 um 19.34.491478×1220 89.3 KB

9

you need to move it to flow as below.

Screenshot_20201110-183627
Screenshot_20201110-1836271920×1080 207 KB

10

Still no effect on the output of the function node :frowning:

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11

What is the output to the debug from the function node. Best to set debug node to complete message object and post result

let setpoint1 = flow.get("setpoint1") || 20;

if(msg.payload >= setpoint1)
{
    msg.payload = "1";
}
else{
    msg.payload = "0";
}
return msg;

you have quotes around setpoint 1, remove them as above
"setpoint1" is a string
setpoint1 is a variable

12

I'm so sorry for your time :pensive: , now it works ! Thanks a lot !

As I said I'm totaly new into this, and sooo many thing you can trip on.

13

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