20 LEDs isnt too many for the arduino to control, even at 20mA each
Hello,I am making a type of LED arrangement almost like a display board with over 20 LEDs being used. My arduino gets very hot when i power 12 of them at once. Can someone draw me a setup on how I could hook up an external Power supply to power all of the LEDs while using the arduino as a switch? Thank you all!!!
Quote from: Hippynerd on Feb 03, 2013, 09:16 pm20 LEDs isnt too many for the arduino to control, even at 20mA eachMy copy of the datasheet says maximum current allowed through the VCC or GND pin is 200mA...20x20 is 400 - too much.
Quote from: fungus on Feb 03, 2013, 11:14 pmQuote from: Hippynerd on Feb 03, 2013, 09:16 pm20 LEDs isnt too many for the arduino to control, even at 20mA eachMy copy of the datasheet says maximum current allowed through the VCC or GND pin is 200mA...20x20 is 400 - too much.I cant find it right now, but Im fairly certain that the 5v line has a 500mA max because of the voltage on board voltage regulator. Each I/O pin is 40, and the 3.3 pin is 50mA. according to:http://arduino.cc/en/Main/ArduinoBoardUnobut it doesnt list the 5v pins current max.I looked in the datasheet thats linked on the same page, and it does list this:DC Current VCC and GND Pins................................ 200.0 mAon page 313, but I think thats the IC, not the arduino as a whole.
Well, that does make me wonder how my units have survived the abuse I have been delivering to them.
it sounds like specifications dont really matter.
Well, technically just using the electronics shortens its life. so the only way to ultimately protect your electronics is to not ever use them. Sample size has nothing to do with it. but if you say it can work until hell freezes over, then it sounds like specifications dont really matter.
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