# LED Brightness, for(), dash board slider, dimming

**URL:** <https://discourse.nodered.org/t/led-brightness-for-dash-board-slider-dimming/28706>\
**Category:** General\
**Created:** [22 June 2020 02:46 UTC](https://discourse.nodered.org/t/led-brightness-for-dash-board-slider-dimming/28706 "2020-06-22T02:46:58Z")\
**Posts on this page:** 1\
**Showing post:** 2

<div class="post-metadata">

**Author:** ![bakman2](https://sea2.discourse-cdn.com/flex026/user_avatar/discourse.nodered.org/bakman2/32/6207_2.png) [@bakman2](https://discourse.nodered.org/u/bakman2)\
**Post date:** [22 June 2020 05:57 UTC](https://discourse.nodered.org/t/led-brightness-for-dash-board-slider-dimming/28706/2 "2020-06-22T05:57:44Z")

</div>

To send msg in a loop you can use `node.send`, eg;

```auto
s = msg.payload

for(x=s;x<255;x++){
  node.send({"brightness":x})
}

```

Then add a delay node, set it rate limit 1 per second, or a fraction; 0.2

 ![Screenshot 2020-06-22 at 07.57.11](https://us1.discourse-cdn.com/flex026/uploads/nodered/original/3X/a/d/ad0402fcf18d872a25464e40eb8ad2cdeaa9d93f.jpeg)

Example flow

```auto
[{"id":"230ec9aa.d10f3e","type":"inject","z":"46161f77.3c21d","name":"","props":[{"p":"payload"}],"repeat":"","crontab":"","once":false,"onceDelay":0.1,"payload":"200","payloadType":"num","x":250,"y":500,"wires":[["dd0be8e0.063e98"]]},{"id":"dd0be8e0.063e98","type":"function","z":"46161f77.3c21d","name":"","func":"s = msg.payload\n\nfor(x=s;x<255;x++){\n\n node.send({\"brightness\":x})\n\n}\n","outputs":1,"noerr":0,"initialize":"","finalize":"","x":400,"y":500,"wires":[["cec8de22.da0a4"]]},{"id":"e19bad9a.a09f98","type":"debug","z":"46161f77.3c21d","name":"","active":true,"tosidebar":true,"console":false,"tostatus":false,"complete":"true","targetType":"full","statusVal":"","statusType":"auto","x":710,"y":500,"wires":[]},{"id":"cec8de22.da0a4","type":"delay","z":"46161f77.3c21d","name":"","pauseType":"rate","timeout":"5","timeoutUnits":"seconds","rate":"1","nbRateUnits":"0.5","rateUnits":"second","randomFirst":"1","randomLast":"5","randomUnits":"seconds","drop":false,"x":550,"y":500,"wires":[["e19bad9a.a09f98"]]}]

```

---

_[View the full topic](https://discourse.nodered.org/t/led-brightness-for-dash-board-slider-dimming/28706)._