Trinket and 3W LED
Moderators: adafruit_support_bill, adafruit

Please be positive and constructive with your questions and comments.

Trinket and 3W LED

by joshuakane on Wed Jun 19, 2019 8:40 am

Hi There,

I purchased a 3W RGB LED https://www.adafruit.com/product/2530

I wanted to be able to turn it on/off and was thinking of using the trinket to do it.

As the LED requires 3W and the Trinket can't provide that could I use one of your UBEC's https://www.adafruit.com/product/1385 connected directly from the power source (4x AA) batteries to the LED Module to power the 3W LED? My thought was I could as 5V x 3A should = 15W.


Posts: 277
Joined: Sat Apr 13, 2013 4:40 pm

Re: Trinket and 3W LED

by adafruit_support_bill on Wed Jun 19, 2019 9:09 am

That is really 3 LEDs in one package. So you need a circuit for each of the 3 channels.
You need something that can switch the 350mA of current required to drive each channel to full intensity.
You also need something that will limit the current to no more than 350mA per channel so you don't burn it out.

For switching the current, you can use transistors. PN2222s would be the most economical. https://www.adafruit.com/product/756
MOSFETs would be a bit more efficient. https://www.adafruit.com/product/355

For current limiting, you will need some resistors. The data sheet tells you the forward voltage for each channel: https://cdn-shop.adafruit.com/product-f ... RGB-Y2.pdf
And there are dozens of LED resistor calculators online: http://ledcalc.com/

Posts: 76150
Joined: Sat Feb 07, 2009 10:11 am

Please be positive and constructive with your questions and comments.