https://www.baldengineer.com/tag/calculatorsRecent content in Calculators on Bald EngineerHugoen-USTue, 24 Mar 2015 16:24:07 +0000https://www.baldengineer.com/led-calculator.htmlWed, 13 Oct 2010 11:44:05 +0000https://www.baldengineer.com/?p=271Rob ’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.