At first, sorry for my Engrish.I would want to know:Can single arduino digital output power 4 LEDs?(Each LED: U= 3.2 V, I = 20 mA.)
Is 9V battery enough to power this for a reasonable time?
I tought that transistor is used to reduce voltage...
Reasonable time is about one hour.
I tought that transistor is used to reduce voltage...Reasonable time is about one hour.
Which battery would be better?And what should I use to reduce voltage?
OK, but how should I reduce voltage from 5V to 3,2V?
R = U / IR = 5V - 3.2V / 0.02A (Each led is 3.2V and takes 20mA)R = 90 Ohm --> Is 100 Ohm resistor before each LED right?Will it work, or will I damage my Arduino?
Quotehttp://evilmadscience.com/productsmenu/tinykitlist/180Thanks fungus!I like that, it looks like the 328 is soldered.
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