I am trying to design a circuit to control a total of 71 RGB LED's (wired basically in parallel for each color channel) using an ATTiny85 to control the on and offs for each color channel. I figure that the current load will be way too much for the ATTiny85 to be directly connected to the LED banks since it max's out at about 40mA per channel.
My thought would be to isolate the LED color banks each on their own transistor. Then I would just connect the bases of the transistors to the ATTiny85's output pins. I figured that this configuration would save me programming for a LED Driver IC.
Does anyone have an input on this evil plan? Also, would a regular 2n2222 appropriate for that?