"Numeric" as delay pin trigger

Dashboard
1

Hello Friends, i'm new here an the last days i worked on my dashboard.

Node red is installed on a Raspberry Pi 3 and I want to build a onboard computer for my motorcycle with a self made chain oiler.

The layout is ready, the ds18b20 and the bme280 sensors work fine.

But now my problem begins.
I need flow for my chainoiler like this:
I want trigger a pin on the raspy for 1 seconds then the pin should go low wait 20seconds (adjustable with the numeric node) then the pin should go high for a second, turn low for 20seconds and so on.

I don't know how to do that flow =(

Sorry for my bad English, I hope you guys understand me.

Best regards
Pierre

2

Welcome to the forum Pierre

What have you tried so far?
See this guide for how to share your flow.

3

Hey Paul, thank you for your answer.
Here ist my flow till yet.

What i want:

If the "Kettenöler" (chainoiler) switch is on, a pin on the raspberry should go high for 1 second, then go low.
Bevor the pin goes high again there should bei a delay in seconds, adjustable with the numeric node "Sekunden/Tropen" (seconds per dip).

i dont know how to do that =(

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4

Your flow includes a number of nodes which I don't have on my system (and I really don't want to install them), but please take a look at the trigger node, which may help with your flow.

5

i dont get it =(

is it so better? (only the specific flow)

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6

Have you looked at the trigger node ?

7

yes but i dont know how to set it up with the numeric node =(

8

It has to be something like the inject node with interval time but adjustable with the numeric node, not fixes.

9

try something like this, not complete but may help, you will need to load the cronplus node before you add this, full node name is node-red-contrib-cron-plus

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1 Like
10

Do you need exactly that or would something like a pulse width modulation signal with a period of 20 seconds and a variable on/off ratio do the job?

11

You've got me interested now Colin. What type of code do you see here? Essentially mine is a PWM signal but obviously you've got a better method in mind, I'd like to see your implementation so I can learn a little too.

12

Thank you very much gerry! you flow is nearly ecact that what i am looking for!

my flow look like this now and work perfect! (you habe to unstall boolean logig ultimate!)

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Thank you very much!

13

Have a look at node-red-contrib-timeprop I think you may find that it does exactly what you want. It is given an input in the range 0 to 1 and generates a time proportioned signal representing that, with a configurable period.

1 Like
14

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