LED Calculator

Parallel LED Circuit (with Resistors)

Rob ‘linear’ Arnold has put together a fantastic LED Series/Parallel Wizard.  Not only will it calculate the current limiting resistor you need, it will draw a circuit diagram, and give you full statistics on power usage.  If you are just getting started with Electronics, this is a great resource for learning about LEDs.  Experienced users will enjoy a quick check of their math.

The array above is designed for some Blue LEDs I have laying around.  I wanted them to run with 15mA which is well below their max, but still very bright.  In this case 1/4W resistors should be fine and each should be 120 ohms.  I should be safe hooking this array up to an Arduino since each LED will draw less than each I/O pin can handle AND total current draw is only 60mA.

Very Cool Stuff!

http://led.linear1.org/led.wiz

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4 thoughts on “LED Calculator

  1. I’ve used Rob’s led calculator many times in the past, now it’s gone the “404” path. Any ideas on what happened ?????

    • Me to… since my first led burnout anno 2010 maby.. to my array of 200 rgb mix.. my guess.. He stoped paying for the hosting or grew tired of it. I tried a few times to rip the code from the page because of this but i cant recall if I at anytime succeded.

  2. calculator is no more work.
    Warning: main(/home/linear1/public_html/led/wp-includes/wp-db.php) [function.main]: failed to open stream: No such file or directory in /home/linear1/public_html/led/wp-settings.php on line 30