# Node RED activating different elements/diodes with Dashboard slider

**URL:** <https://discourse.nodered.org/t/node-red-activating-different-elements-diodes-with-dashboard-slider/44082>\
**Category:** Dashboard\
**Created:** [13 April 2021 07:23 UTC](https://discourse.nodered.org/t/node-red-activating-different-elements-diodes-with-dashboard-slider/44082 "2021-04-13T07:23:29Z")\
**Posts on this page:** 3\
**Page:** 1

<div class="post-metadata">

**Author:** ![Nikolay](https://avatars.discourse-cdn.com/v4/letter/n/a698b9/32.png) [@Nikolay](https://discourse.nodered.org/u/Nikolay)\
**Post date:** [13 April 2021 07:23 UTC](https://discourse.nodered.org/t/node-red-activating-different-elements-diodes-with-dashboard-slider/44082/1 "2021-04-13T07:23:29Z")

</div>

Hello to All,

I used the Dashoboard slider to activate different elements, in my case raspberry pi 4 GPIO connected to diodes. The idea is that the slider has 4 steps 0, 1, 2 and.

When the slider is on 0 no diode shines.

When the slider is on 1, 1 diode shines.

When the slider is on 2, 2 diodes shine.

When the slider is on 3, all 3 diodes shine.

Just for information I also use links as the raspberry pi logic is in another flow. For interacting with raspberry pi I use the module " node-red-node-pi-gpio" (you need to have Node-RED on the raspberry pi, to control its GPIO pins)

[https://nodered.org/docs/faq/interacting-with-pi-gpio](https://nodered.org/docs/faq/interacting-with-pi-gpio)

The function "Func1" to make the fist diode to shine, when the slider is 1, 2 or 3 position is:

```auto
if (msg.payload == 1 || msg.payload == 2 || msg.payload == 3)
{
    msg.payload = 1;
} else {
    
    msg.payload = 0;
    
}
return msg;

```

 ![image](https://us1.discourse-cdn.com/flex026/uploads/nodered/original/3X/f/8/f83b3310a8d9d9abe715282d8b2388b6af868023.png)

![image](https://us1.discourse-cdn.com/flex026/uploads/nodered/original/3X/f/e/fe3b71579a2f659e677ae90f1f82987475524f35.png)

```auto
[{"id":"58826869.170d3","type":"ui_slider","z":"794cd749.ae3b9","name":"","label":"slider","tooltip":"","group":"dd11ee4.37f1b1","order":1,"width":0,"height":0,"passthru":false,"outs":"end","topic":"","topicType":"str","min":"0","max":"3","step":1,"x":330,"y":220,"wires":[["e3cc053c.5a3a38","9315d9b8.578a88","5bd7ebe0.9520fc"]]},{"id":"79d30609.fb0ed8","type":"link out","z":"794cd749.ae3b9","name":"1","links":["c6843345.dbac1"],"x":1095,"y":140,"wires":[]},{"id":"eba0eeb4.6eb45","type":"link out","z":"794cd749.ae3b9","name":"2","links":["6ba11d90.a3f234"],"x":1095,"y":240,"wires":[]},{"id":"775d7f38.06d928","type":"link out","z":"794cd749.ae3b9","name":"3","links":["ab6516ea.646c18"],"x":1095,"y":320,"wires":[]},{"id":"e3cc053c.5a3a38","type":"function","z":"794cd749.ae3b9","name":"Func1","func":"if (msg.payload == 1 || msg.payload == 2 || msg.payload == 3)\n{\n msg.payload = 1;\n} else {\n \n msg.payload = 0;\n \n}\nreturn msg;","outputs":1,"noerr":0,"initialize":"","finalize":"","x":730,"y":140,"wires":[["79d30609.fb0ed8"]]},{"id":"9315d9b8.578a88","type":"function","z":"794cd749.ae3b9","name":"Func2","func":"if (msg.payload == 2 || msg.payload == 3)\n{\n msg.payload = 1;\n} else {\n \n msg.payload = 0;\n \n}\nreturn msg;","outputs":1,"noerr":0,"initialize":"","finalize":"","x":720,"y":240,"wires":[["eba0eeb4.6eb45"]]},{"id":"5bd7ebe0.9520fc","type":"function","z":"794cd749.ae3b9","name":"Func3","func":"if (msg.payload == 3)\n{\n msg.payload = 1;\n} else {\n \n msg.payload = 0;\n \n}\nreturn msg;","outputs":1,"noerr":0,"initialize":"","finalize":"","x":720,"y":320,"wires":[["775d7f38.06d928"]]},{"id":"dd11ee4.37f1b1","type":"ui_group","name":"Default","tab":"e66b254.14380d8","order":1,"disp":true,"width":"6","collapse":false},{"id":"e66b254.14380d8","type":"ui_tab","name":"Home","icon":"dashboard","order":2,"disabled":false,"hidden":false}]

```

---

<div class="post-metadata">

**Author:** ![E1cid](https://sea2.discourse-cdn.com/flex026/user_avatar/discourse.nodered.org/e1cid/32/77971_2.png) [@E1cid](https://discourse.nodered.org/u/E1cid)\
**Post date:** [13 April 2021 08:08 UTC](https://discourse.nodered.org/t/node-red-activating-different-elements-diodes-with-dashboard-slider/44082/2 "2021-04-13T08:08:53Z")

</div>

Try this, It will send 1 or 0 to corresponding outputs depending on slider value.

```auto
[{"id":"17cf4abc.4dffb5","type":"inject","z":"5a245aa1.510164","name":"","props":[{"p":"payload"},{"p":"topic","vt":"str"}],"repeat":"","crontab":"","once":false,"onceDelay":0.1,"topic":"","payload":"0","payloadType":"num","x":240,"y":3860,"wires":[["58826869.170d3"]]},{"id":"58826869.170d3","type":"ui_slider","z":"5a245aa1.510164","name":"","label":"slider","tooltip":"","group":"dd11ee4.37f1b1","order":1,"width":0,"height":0,"passthru":true,"outs":"end","topic":"","topicType":"str","min":"0","max":"3","step":1,"x":340,"y":3940,"wires":[["e3cc053c.5a3a38"]]},{"id":"e3cc053c.5a3a38","type":"function","z":"5a245aa1.510164","name":"Func1","func":"if (msg.payload == 1 ){\n return [{payload: 1},{payload: 0}, {payload: 0}]\n}else if ( msg.payload == 2 ){\n return [{payload: 1},{payload: 1}, {payload: 0}]\n}else if ( msg.payload == 3){\n return [{payload: 1},{payload: 1}, {payload: 1}]\n}else{\n return [{payload: 0},{payload: 0}, {payload: 0}]\n}\n\n","outputs":3,"noerr":0,"initialize":"","finalize":"","x":480,"y":3940,"wires":[["223e5053.1d17e"],["223e5053.1d17e"],["223e5053.1d17e"]]},{"id":"a755c89.8a54338","type":"inject","z":"5a245aa1.510164","name":"","props":[{"p":"payload"},{"p":"topic","vt":"str"}],"repeat":"","crontab":"","once":false,"onceDelay":0.1,"topic":"","payload":"3","payloadType":"num","x":260,"y":4100,"wires":[["58826869.170d3"]]},{"id":"27ebd5d9.45522a","type":"inject","z":"5a245aa1.510164","name":"","props":[{"p":"payload"},{"p":"topic","vt":"str"}],"repeat":"","crontab":"","once":false,"onceDelay":0.1,"topic":"","payload":"2","payloadType":"num","x":260,"y":4040,"wires":[["58826869.170d3"]]},{"id":"e423764d.a9e948","type":"inject","z":"5a245aa1.510164","name":"","props":[{"p":"payload"},{"p":"topic","vt":"str"}],"repeat":"","crontab":"","once":false,"onceDelay":0.1,"topic":"","payload":"1","payloadType":"num","x":240,"y":4000,"wires":[["58826869.170d3"]]},{"id":"223e5053.1d17e","type":"debug","z":"5a245aa1.510164","name":"","active":true,"tosidebar":true,"console":false,"tostatus":false,"complete":"false","statusVal":"","statusType":"auto","x":710,"y":3920,"wires":[]},{"id":"dd11ee4.37f1b1","type":"ui_group","name":"Default","tab":"e66b254.14380d8","order":1,"disp":true,"width":"6","collapse":false},{"id":"e66b254.14380d8","type":"ui_tab","name":"Home","icon":"dashboard","order":2,"disabled":false,"hidden":false}]

```

---

<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:** [13 May 2021 08:09 UTC](https://discourse.nodered.org/t/node-red-activating-different-elements-diodes-with-dashboard-slider/44082/3 "2021-05-13T08:09:20Z")

</div>

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