How to dim/brighten RGB strip lights over time

[phreaq]

Hi folks,

I have a few RGB light strips hooked up via a wifi controller, and I am controlling them thru node-red/ha.

Is there a routine/method, that I can have the lights slow dim/brighten over time?

For example, if i have a flow that will dim the light strip to 20% brightness over 5 minutes, it would find the current brightness value, find the delta difference, and then gradually decrease that difference over the 5 minute time frame.

I suspect several components would be needed to do this, which would fire an event off to the wifi controllers ever x seconds or so.

has anyone done this yet, or have any pointers?

TIA

[bakman2]

This is a very broad question, with a very broad answer: node-red can do it.

There are many ways to do this, with home assistant I don't know because I don't use that, but I can imagine that you can control your wifi controller directly from NR or from HA.

But there is not a "component" that will do this for you because of the many variables that apply.

Questions:

• Do you "just" want to dim the strip to 20% brightness over 5 minutes or
• Do you want to sync it to something like sunrise
• Do you want it to happen on a specific time or via a certain trigger ?

[phreaq]

bakman2, thanks for the reply.

In this case, I "just" want to dim the strip to 20% brightness over 5 minutes. Once that's figured out, I can trigger it with various other items in my other nodes.

[bakman2]

Simple example:

5 minutes is 300 seconds, send value+1 every 15 seconds, 20 times = 5 minutes and the 20% brightness you should map yourself somewhere towards the striplight.

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[cflurin]

Have a look at the dsm wiki

cflurin/node-red-contrib-dsm

or

cflurin/node-red-contrib-dsm

[phreaq]

bakman2, that's exactly what I needed.

I made a few tweaks, as needed, and works perfect, thanks!

[phreaq]

In case anyone stumbles on this in the future, here's a bit more coding based around bakman2's original code.

I added in a few variables, and have a few checks and balances going on (it will dim or brighten accordingly).

this is my first chunk of code done in js, so it may not be to best practices...

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5 seconds","func":"var Desired_Brightness_Pct = 0  //key in desired percent value (0-100)\nvar Desired_Time = 5 //transition time in seconds\n\n//do not edit below this line\n\nvar CurrBrightness_Pct = 0\nvar TimerValue = 1\nvar LightStatus = (msg.data.state)\n\nif (LightStatus == \"on\")  \n    {\n        CurrBrightness_Pct = (((msg.data.attributes.brightness)/255*100).toFixed(0))\n    }\n    else\n    {\n        CurrBrightness_Pct =  0\n    }\n\nvar Delta = (Desired_Brightness_Pct - CurrBrightness_Pct)\n\nif(Delta < 0)\n    {\n      TimerValue = ((Desired_Time/(Delta)*-1)*1000) \n    } \n    else\n    {\n      TimerValue = ((Desired_Time/Delta)*1000)\n    }\nlet CBP = CurrBrightness_Pct\n\ndimmer()\nvar timer = setInterval(dimmer, TimerValue);\n\nfunction dimmer() \n{\n    if(Delta > 0)\n        {\n           if(CBP >= Desired_Brightness_Pct)\n           {\n              node.send({payload:{dimmer:Desired_Brightness_Pct}}) \n              stopDimmer() \n           }\n           else\n           {\n                node.send({payload:{dimmer:CBP}})\n                 CBP++\n           }\n        }\n    else\n        {\n            if(CBP <= Desired_Brightness_Pct)\n           {\n              node.send({payload:{dimmer:Desired_Brightness_Pct}})  \n              stopDimmer() \n           }\n           else\n           {\n                node.send({payload:{dimmer:CBP}})\n                 CBP--\n           }\n        }\n        \n}\n\nfunction stopDimmer() {\n  clearInterval(timer);\n}\n\n\n\n","outputs":1,"noerr":0,"x":1050,"y":2160,"wires":[["f7e68c7d.82751"]]},{"id":"f7e68c7d.82751","type":"api-call-service","z":"25593659.aa9afa","name":"Kitchen Upper (128, 20, 0)","server":"1e3a8fe9.e93cf","version":1,"debugenabled":false,"service_domain":"light","service":"turn_on","entityId":"light.kitchen_upper","data":"{\"rgb_color\":[128,20,0],\"brightness_pct\":\"{{payload.dimmer}}\"}","dataType":"json","mergecontext":"","output_location":"","output_location_type":"none","mustacheAltTags":false,"x":1500,"y":2180,"wires":[[]]},{"id":"1e3a8fe9.e93cf","type":"server","z":"","name":"Home Assistant","legacy":false,"addon":true,"rejectUnauthorizedCerts":true,"ha_boolean":"y|yes|true|on|home|open","connectionDelay":true,"cacheJson":true}]