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Need Potentiometer Advice for LED Strips
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Need Potentiometer Advice for LED Strips

by andypoms on Wed Aug 14, 2019 6:15 pm

I'm looking to setup two analog LED strips - one Warm White & one Cool While (about 1m each) with a potentiometer that will let me go either full warm or full cool or any combination in between.

I'm looking for something larger for a panel mount application.

What would be the best potentiometer to get for this? How do I know how much resistance I need?

andypoms
 
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Re: Need Potentiometer Advice for LED Strips

by adafruit_support_bill on Wed Aug 14, 2019 7:38 pm

You can't dim those strips directly with a typical potentiometer. You would need a power rheostat capable of handling the full current for driving the strips.

A better approach using common potentiometers is to have a microcontroller and some power MOSFETs to dim the strips via PWM.

This page shows an Arduino microcontroller driving an RGB strip with 3 power MOSFETs. You could use 2 channels of that same circuit to drive your warm and cool strips.
https://learn.adafruit.com/rgb-led-strips/usage

This guide shows how to use a potentiometer as an analog input to a microcontroller:
https://learn.adafruit.com/make-it-chan ... ntiometers

We have a selection of panel mount pots here:
https://www.adafruit.com/?q=pot%20panel

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Re: Need Potentiometer Advice for LED Strips

by andypoms on Wed Aug 14, 2019 8:22 pm

I'm looking for something basic - no microcontroller.

andypoms
 
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Re: Need Potentiometer Advice for LED Strips

by adafruit_support_bill on Wed Aug 14, 2019 8:34 pm

Probably something like this would work: https://www.mouser.com/ProductDetail/Oh ... Kso8tOc%3D

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