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Topic: [Mini Arduino Pro] Driving 12 RGB LEDS Questions (Read 2 times) previous topic - next topic

Grumpy_Mike

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With this chip i need a resistor on each LED too?

Yes.
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if i will use 3 outputs of this chip to drive each R-G-B line of 2-3 RGB leds in parallel, in this case i will need a Transistor, right?

Yes.

Xl97 - he said he has common cathode LEDs so unfortunately that is not the right way to wire those.

xl97

#11
Jan 15, 2013, 02:37 am Last Edit: Jan 15, 2013, 05:27 pm by xl97 Reason: 1
yikes!..

I'll remove the images right away as to not confuse!..

(but correct for common 'annode' (+) leds)??



images update..(both RGB types posted)

thanks.

update: corrected/both images added*

Grumpy_Mike



Grumpy_Mike

Yes very nice. You just need to say that for the common cathode type you will need PNP transistors and NPN for common anode.

The transistor common line is always the emitter with the collector going off to the LEDs.

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