Comments on: How do RGB LEDs work?

By: Joana Paulo Pardal | C0de2CR8

Joana Paulo Pardal | C0de2CR8 — Sun, 26 Feb 2023 16:26:05 +0000

You need a higher resistance on RED so it doesn’t overlap the other colors.
I’m using 150R for the Red leg and 100R for the Green and Blue legs and manage to see all the colors (I found the values here):
https://diotlabs.daraghbyrne.me/docs/leds-continued/images/rgbled_1.png

Using the same on all the legs doesn’t seams to work in practice…

By: Sara Santos

Sara Santos — Wed, 26 Oct 2022 10:40:28 +0000

In reply to Mitja.

Hi.
I guess if you get one with three connectors, it will work as a regular potentiometer/trimpot.
So, you’ll just need to make sure you wire it correctly: VCC, GND, and data, and you’ll be fine to go with the examples provided.
You can take a look at this tutorial from another blog that explains it quite well: mschoeffler.com/2020/11/14/arduino-tutorial-slide-potentiometer-slide-pot-controls-led-strip-ws2812b/
Regards,
Sara

By: Mitja

Mitja — Tue, 25 Oct 2022 18:58:14 +0000

Hello.

Great info and just what i need for my project. I see some old comments, so i hope i can still get some help.

I’m thinking about buying 1K sliding potentiometers, instead of trimpot. What should i pay attention to, when buying. I assume number of connectors is important?

By: Sara Santos

Sara Santos — Sat, 20 Feb 2021 16:37:28 +0000

In reply to Fabian F..

Hi.
Yes, you can use them as long as you reference our website in the References section.
Regards
Sara

By: Fabian F.

Fabian F. — Fri, 19 Feb 2021 20:50:19 +0000

Subject: Thesis

Hello,
I read your article about rgb leds and found the pictures very well done. can I please use this in my thesis?

With best regards
Fabian Feyerer

By: Paulo Medronho

Paulo Medronho — Fri, 30 Aug 2019 11:30:39 +0000

Nevermind,
I was applying low voltage (resistance 220 included on each “leg” color) when applied pure 3V i got the all colors and got white.

By: Paulo Medronho

Paulo Medronho — Fri, 30 Aug 2019 11:25:55 +0000

I bought a pack of RBG leds (Cathode) that can mix blue and green but it can’t do RED with any other colors. Any time I activate RED it offs other colors (I was trying to get white, mixing all colors).
What could I be doing wrong or what Leds should I be looking in order to get white trough mixing?
Thanks,
Paulo Medronho

By: Satish

Satish — Mon, 26 Aug 2019 11:07:23 +0000

Very nice article for students.

By: Jelle Aarnoudse

Jelle Aarnoudse — Tue, 12 Feb 2019 14:45:03 +0000

Nice article. May I ask what’s the reason for the dots in (255./1023.)?

By: Sara Santos

Sara Santos — Mon, 29 Oct 2018 09:34:35 +0000

In reply to Bear Graves.

Hi.
You can send your questions using our contact page: https://randomnerdtutorials.com/contact/
Regards,
Sara 🙂