# "Numeric" as delay pin trigger

**URL:** <https://discourse.nodered.org/t/numeric-as-delay-pin-trigger/22395>\
**Category:** Dashboard\
**Created:** [28 February 2020 22:29 UTC](https://discourse.nodered.org/t/numeric-as-delay-pin-trigger/22395 "2020-02-28T22:29:36Z")\
**Posts on this page:** 14\
**Page:** 1

<div class="post-metadata">

**Author:** ![MasterOfPuppets](https://avatars.discourse-cdn.com/v4/letter/m/e47c2d/32.png) [@MasterOfPuppets](https://discourse.nodered.org/u/MasterOfPuppets)\
**Post date:** [28 February 2020 22:29 UTC](https://discourse.nodered.org/t/numeric-as-delay-pin-trigger/22395/1 "2020-02-28T22:29:36Z")

</div>

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

---

<div class="post-metadata">

**Author:** ![Paul-Reed](https://sea2.discourse-cdn.com/flex026/user_avatar/discourse.nodered.org/paul-reed/32/66906_2.png) [@Paul-Reed](https://discourse.nodered.org/u/Paul-Reed)\
**Post date:** [28 February 2020 23:14 UTC](https://discourse.nodered.org/t/numeric-as-delay-pin-trigger/22395/2 "2020-02-28T23:14:20Z")

</div>

Welcome to the forum Pierre

What have you tried so far?  
See [this guide](https://discourse.nodered.org/t/how-to-share-code-or-flow-json/506) for how to share your flow.

---

<div class="post-metadata">

**Author:** ![MasterOfPuppets](https://avatars.discourse-cdn.com/v4/letter/m/e47c2d/32.png) [@MasterOfPuppets](https://discourse.nodered.org/u/MasterOfPuppets)\
**Post date:** [28 February 2020 23:37 UTC](https://discourse.nodered.org/t/numeric-as-delay-pin-trigger/22395/3 "2020-02-28T23:37:14Z")

</div>

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 =(

```auto
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```

---

<div class="post-metadata">

**Author:** ![Paul-Reed](https://sea2.discourse-cdn.com/flex026/user_avatar/discourse.nodered.org/paul-reed/32/66906_2.png) [@Paul-Reed](https://discourse.nodered.org/u/Paul-Reed)\
**Post date:** [29 February 2020 00:03 UTC](https://discourse.nodered.org/t/numeric-as-delay-pin-trigger/22395/4 "2020-02-29T00:03:03Z")

</div>

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.

---

<div class="post-metadata">

**Author:** ![MasterOfPuppets](https://avatars.discourse-cdn.com/v4/letter/m/e47c2d/32.png) [@MasterOfPuppets](https://discourse.nodered.org/u/MasterOfPuppets)\
**Post date:** [29 February 2020 00:05 UTC](https://discourse.nodered.org/t/numeric-as-delay-pin-trigger/22395/5 "2020-02-29T00:05:49Z")

</div>

i dont get it =(

is it so better? (only the specific flow)

```auto
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```

---

<div class="post-metadata">

**Author:** ![Paul-Reed](https://sea2.discourse-cdn.com/flex026/user_avatar/discourse.nodered.org/paul-reed/32/66906_2.png) [@Paul-Reed](https://discourse.nodered.org/u/Paul-Reed)\
**Post date:** [29 February 2020 00:10 UTC](https://discourse.nodered.org/t/numeric-as-delay-pin-trigger/22395/6 "2020-02-29T00:10:18Z")

</div>

Have you looked at the `trigger` node ?

---

<div class="post-metadata">

**Author:** ![MasterOfPuppets](https://avatars.discourse-cdn.com/v4/letter/m/e47c2d/32.png) [@MasterOfPuppets](https://discourse.nodered.org/u/MasterOfPuppets)\
**Post date:** [29 February 2020 00:31 UTC](https://discourse.nodered.org/t/numeric-as-delay-pin-trigger/22395/7 "2020-02-29T00:31:31Z")

</div>

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

---

<div class="post-metadata">

**Author:** ![MasterOfPuppets](https://avatars.discourse-cdn.com/v4/letter/m/e47c2d/32.png) [@MasterOfPuppets](https://discourse.nodered.org/u/MasterOfPuppets)\
**Post date:** [29 February 2020 00:59 UTC](https://discourse.nodered.org/t/numeric-as-delay-pin-trigger/22395/8 "2020-02-29T00:59:25Z")

</div>

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

---

<div class="post-metadata">

**Author:** ![gerry](https://sea2.discourse-cdn.com/flex026/user_avatar/discourse.nodered.org/gerry/32/21604_2.png) [@gerry](https://discourse.nodered.org/u/gerry)\
**Post date:** [29 February 2020 02:02 UTC](https://discourse.nodered.org/t/numeric-as-delay-pin-trigger/22395/9 "2020-02-29T02:02:35Z")

</div>

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

```auto
[{"id":"5239bd08.7e1714","type":"tab","label":"Flow 1","disabled":false,"info":""},{"id":"8fac93df.29ad08","type":"ui_numeric","z":"5239bd08.7e1714","name":"Sekunden/Tropfen","label":"<font size =6>Sekunden/Tropfen","tooltip":"","group":"f1b663b.ad5f4a","order":7,"width":"0","height":"0","wrap":false,"passthru":true,"topic":"","format":"<font size =6>{{value}}","min":"20","max":"180","step":"1","x":170,"y":420,"wires":[["7e6e5b10.4b3fa4"]]},{"id":"eb331a2e.c4f528","type":"comment","z":"5239bd08.7e1714","name":"high one second low adjustable","info":"","x":450,"y":340,"wires":[]},{"id":"7e6e5b10.4b3fa4","type":"function","z":"5239bd08.7e1714","name":"program cron","func":"let z = msg.payload;\n\n\n\nmsg.payload =\n{\"command\":\"add\",\n\"name\":\"Timer1\",\n\"expression\":\"*/\" + z + \" * * * * * *\",\n\"payload\": 1,\n\"type\":\"str\",\n}\n\nnode.status({fill:\"blue\",shape:\"dot\",text:\"Payload \" + z});\n\n\n\n\nreturn msg;","outputs":1,"noerr":0,"x":420,"y":420,"wires":[["f20f695a.b2723"]]},{"id":"f20f695a.b2723","type":"cronplus","z":"5239bd08.7e1714","name":"timer","outputField":"payload","timeZone":"","options":[{"topic":"","payload":"","type":"str","expression":""}],"x":690,"y":420,"wires":[["4998c889.ce1f7"]]},{"id":"4998c889.ce1f7","type":"trigger","z":"5239bd08.7e1714","op1":"1","op2":"0","op1type":"str","op2type":"str","duration":"1","extend":false,"units":"s","reset":"","bytopic":"all","name":"","x":900,"y":420,"wires":[["43c8a112.c5d96"]]},{"id":"43c8a112.c5d96","type":"function","z":"5239bd08.7e1714","name":"show output","func":"let z = msg.payload;\n\nnode.status({fill:\"blue\",shape:\"dot\",text:\"Payload \" + z});\n\nreturn msg;","outputs":1,"noerr":0,"x":1110,"y":420,"wires":[[]]},{"id":"f1b663b.ad5f4a","type":"ui_group","z":"","name":"Umgebungsbedingungen","tab":"98b0b722.d8f158","order":3,"disp":false,"width":"26","collapse":false},{"id":"98b0b722.d8f158","type":"ui_tab","z":"","name":"Motorraddisplay","icon":"dashboard","disabled":false,"hidden":false}]

```

---

<div class="post-metadata">

**Author:** ![Colin](https://sea2.discourse-cdn.com/flex026/user_avatar/discourse.nodered.org/colin/32/17040_2.png) [@Colin](https://discourse.nodered.org/u/Colin)\
**Post date:** [29 February 2020 11:22 UTC](https://discourse.nodered.org/t/numeric-as-delay-pin-trigger/22395/10 "2020-02-29T11:22:15Z")

</div>

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?

---

<div class="post-metadata">

**Author:** ![gerry](https://sea2.discourse-cdn.com/flex026/user_avatar/discourse.nodered.org/gerry/32/21604_2.png) [@gerry](https://discourse.nodered.org/u/gerry)\
**Post date:** [29 February 2020 12:17 UTC](https://discourse.nodered.org/t/numeric-as-delay-pin-trigger/22395/11 "2020-02-29T12:17:35Z")

</div>

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.

---

<div class="post-metadata">

**Author:** ![MasterOfPuppets](https://avatars.discourse-cdn.com/v4/letter/m/e47c2d/32.png) [@MasterOfPuppets](https://discourse.nodered.org/u/MasterOfPuppets)\
**Post date:** [29 February 2020 12:34 UTC](https://discourse.nodered.org/t/numeric-as-delay-pin-trigger/22395/12 "2020-02-29T12:34:26Z")

</div>

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!)

```auto
[{"id":"ae81b4f7.3c6848","type":"InterruptFlowUltimate","z":"5eb3c81f.5e5548","name":"Interrupt Flow","triggertopic":"trigger","x":700,"y":660,"wires":[["55ddbfe9.7c0cc"]]},{"id":"67f757a.92d4da8","type":"ui_switch","z":"5eb3c81f.5e5548","name":"Kettenöler","label":"<font size =6>Kettenöler","tooltip":"","group":"2ba0ecdd.afa884","order":10,"width":"5","height":"2","passthru":true,"decouple":"false","topic":"trigger","style":"","onvalue":"true","onvalueType":"bool","onicon":"fa-cog fa-spin fa-4x","oncolor":"green","offvalue":"false","offvalueType":"bool","officon":"fa-power-off fa-4x","offcolor":"red","x":450,"y":660,"wires":[["ae81b4f7.3c6848"]]},{"id":"76038a0e.9538d4","type":"inject","z":"5eb3c81f.5e5548","name":"","topic":"","payload":"false","payloadType":"bool","repeat":"","crontab":"","once":true,"onceDelay":"1","x":230,"y":620,"wires":[["c5307206.6eb52","67f757a.92d4da8"]]},{"id":"55ddbfe9.7c0cc","type":"trigger","z":"5eb3c81f.5e5548","op1":"1","op2":"0","op1type":"num","op2type":"num","duration":"1","extend":false,"units":"s","reset":"","bytopic":"all","name":"","x":930,"y":660,"wires":[[]]},{"id":"3101e30f.6ed82c","type":"cronplus","z":"5eb3c81f.5e5548","name":"timer","outputField":"payload","timeZone":"","options":[{"topic":"","payload":"","type":"str","expression":""}],"x":630,"y":740,"wires":[["ae81b4f7.3c6848"]]},{"id":"90b4f976.e46a58","type":"function","z":"5eb3c81f.5e5548","name":"program cron","func":"let z = msg.payload;\n\n\n\nmsg.payload =\n{\"command\":\"add\",\n\"name\":\"Timer1\",\n\"expression\":\"*/\" + z + \" * * * * * *\",\n\"payload\": 1,\n\"type\":\"str\",\n}\n\nnode.status({fill:\"blue\",shape:\"dot\",text:\"Payload \" + z});\n\n\n\n\nreturn msg;","outputs":1,"noerr":0,"x":450,"y":740,"wires":[["3101e30f.6ed82c"]]},{"id":"100db837.1cf948","type":"ui_numeric","z":"5eb3c81f.5e5548","name":"Sekunden/Tropfen","label":"<font size =6>Sekunden/Tropf","tooltip":"","group":"2ba0ecdd.afa884","order":7,"width":"6","height":"2","wrap":true,"passthru":false,"topic":"","format":"<font size =6>{{value}}","min":"20","max":"180","step":"20","x":250,"y":740,"wires":[["90b4f976.e46a58"]]},{"id":"2ba0ecdd.afa884","type":"ui_group","z":"","name":"Umgebungsbedingungen","tab":"1c07db11.fd2435","order":3,"disp":false,"width":"26","collapse":false},{"id":"1c07db11.fd2435","type":"ui_tab","z":"","name":"Motorraddisplay","icon":"dashboard","disabled":false,"hidden":true}]

```

Thank you very much!

---

<div class="post-metadata">

**Author:** ![Colin](https://sea2.discourse-cdn.com/flex026/user_avatar/discourse.nodered.org/colin/32/17040_2.png) [@Colin](https://discourse.nodered.org/u/Colin)\
**Post date:** [29 February 2020 13:25 UTC](https://discourse.nodered.org/t/numeric-as-delay-pin-trigger/22395/13 "2020-02-29T13:25:31Z")

</div>

Have a look at [node-red-contrib-timeprop](https://www.npmjs.com/package/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.

---

<div class="post-metadata">

**Author:** ![system](https://us1.discourse-cdn.com/flex026/uploads/nodered/original/1X/d073cd938eafa2e558d7c2cd59003b3ef4963033.png) [@system](https://discourse.nodered.org/u/system)\
**Post date:** [14 March 2020 13:31 UTC](https://discourse.nodered.org/t/numeric-as-delay-pin-trigger/22395/14 "2020-03-14T13:31:07Z")

</div>

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