Voting resources, early voting, and poll worker information - VOTE. ... Adafruit is open and shipping.
0

My Star Trek Day project needs help! Dimming flex strip?
Moderators: adafruit_support_bill, adafruit

Please be positive and constructive with your questions and comments.

My Star Trek Day project needs help! Dimming flex strip?

by neoBigD on Tue Sep 08, 2020 4:49 pm

Happy Star Trek Day everyone! I realized i had been putting off a project i started while back using that great flex led strip stuff. But after assembling my design (the great Delta symbol!) i noticed its quite bright! I'm looking for a simple method to create a dimmer control for this but i doubt just putting a rheostat in-line on the 12v line is good, let alone safe.

Any suggestions that i can create today with simple components most people would have around? (i have quite a few parts)

Thanks all, and Live Long and Prosper!

Update: And yes i have been searching for a solution but find things from complex multi-component ones to simpler ones but using stuff i dont have. I did find these ones that i might try, any input or pros/cons on their setup?
http://www.circuitdiagram.org/simple-12 ... immer.html
http://www.circuitdiagram.org/simple-le ... rcuit.html



Delta test(1).jpg
Delta test(1).jpg (554.57 KiB) Viewed 38 times

neoBigD
 
Posts: 6
Joined: Sat Apr 26, 2014 9:42 pm

Re: My Star Trek Day project needs help! Dimming flex strip?

by dastels on Tue Sep 08, 2020 9:50 pm

You can't really dim LEDs very effectively the way you can dim incandescent bulbs. generally you will need to use a PWM signal to control a power transistor to rapidly turn the LEDs off & on. The higher % of the time they're on, the brighter they will appear. See https://learn.adafruit.com/transistors-101/example-uses.

Dave

dastels
 
Posts: 3781
Joined: Tue Oct 20, 2015 3:22 pm

Re: My Star Trek Day project needs help! Dimming flex strip?

by caitlinsdad on Wed Sep 09, 2020 3:56 pm

Would trying to power it with 9v or something lower than 12v work? Will you still be using a variable bench power supply where you can just dial in the output voltage? Good luck.

caitlinsdad
 
Posts: 611
Joined: Fri Feb 24, 2012 4:23 pm

Re: My Star Trek Day project needs help! Dimming flex strip?

by dastels on Wed Sep 09, 2020 4:04 pm

I think it depends on exactly what LED strip is involved. Can you link us to the product listing?

Dave

dastels
 
Posts: 3781
Joined: Tue Oct 20, 2015 3:22 pm

Re: My Star Trek Day project needs help! Dimming flex strip?

by neoBigD on Wed Sep 09, 2020 6:29 pm

https://www.adafruit.com/product/3866

Reading the product listing, it does mention using from 9v to 12v!
I kind of had the same thought this morning and am testing with a 9v power source, and it does look better in person.
Guess I should have came back to this page to review product info, thanks for the thought!

neoBigD
 
Posts: 6
Joined: Sat Apr 26, 2014 9:42 pm

Please be positive and constructive with your questions and comments.