1) I couldn't understand the diagram with them, so I winged it.... these are wired in parallel?2) The Specs days that require 20ma per unit?, 3) is that 20ma in total when all 3 "Diodes" in side one RGB LED is Lit?4) is "3" is correct wouldn't the total current of all 3 lit LED's draw 60ma? 5) if "5" is correct why do they still all light, when the max output of the Arduino pins(in this case the the Regulated 5v pin) is only 40ma?
Thanks Mike So the resistor is limiting what the led's are pulling less then 20ma , does mean that they are not at there optium current for optium brightness?
but if the LEDs have to be matched for brightness it won't work.
Quotebut if the LEDs have to be matched for brightness it won't work.No so.There will be very little difference in brightness with the same LED running at 20mA controlled by a resistor from 5V. Lower than a JND (just noticeable difference).Any brightness variation will come from the LEDs themselves not the variation in current. As such constant current control will not help.
but you cannot use the above resistors, before this would overload the arduino since it can only supply 40ma from a pin at a time and since the they are using common anode on the 5v pin.
I thought LED's had a limit that they only activated(switched on) at, is that a Volt Level or Amp level?
I didn't know you could run then at lower current levels.
Thanks Mike, Totally got a grip on it now Thanks mucho mucho mucho appreciated. yer a star