Wiring RGB LED
Moderators: adafruit_support_bill, adafruit

Wiring RGB LED

by maggiemouse on Mon Mar 18, 2013 10:17 am

I'm working on a prop gun that I am putting LEDS in. Due to size constraints and because the LEDs do not need to be individually controllable instead of using 12mm RGB strands I opted to solder leads onto 5mm RGB LEDS (http://www.adafruit.com/products/302). Ideally they are going to be hooked up and controlled by an Arduino but since there are quite a few LEDs (38) I was wondering how to wire them without frying anything.

Is it ok to wire them in parallel? (red to red blue to blue) I know I will need resistors but will I need a transistor to run them with an Arduino?
maggiemouse
 
Posts: 2
Joined: Sun Mar 17, 2013 9:32 pm

Re: Wiring RGB LED

by adafruit_support_bill on Mon Mar 18, 2013 10:34 am

You can wire them in parallel, but you will want separate current limiting resistors for each cathode (R, G and B leads) on each led. With 38 leds wired together, you will need to sink 760 mA on each of the R G and B channels. That is too much for an Arduino pin. You would need transistors like the PN2222: https://www.adafruit.com/products/756
User avatar
adafruit_support_bill
 
Posts: 31820
Joined: Sat Feb 07, 2009 10:11 am