However, none of my blue lights turn on, only the red ones.
the only way to make any sense out of this whole thing is to take a single
Led in hand, and play with it until you get the pin connections straightened out.
Then, if I truly believed they had built-in Rs, I would take exactly one Led with the
intent that I might be sacrificing it to the gods of thermodynamics, and apply full
voltage to it, and see if it glowed for an instant and then forever flamed out.
ONLY THEN would I hook up the original ckt shown. Better than blowing up $18 worth
of Leds at square one.
Yeah, I did all that. That's how I know that the LED works at full current on 3.3v, at least the 3.3 volts supplied by my Teensy3. That's also how I know I've for sure got the wiring right for this particular model of LED. I know that I am not going to blow these out at this voltage, and my question is why the blue lights aren't turning on when the red ones are on, not whether or not I'm about to blow up 20 bucks of hardware. I'm not.
However, thank you for the recommendation for the three grounds and resistor on Adafruit. I'll be making a better board today and implement protection and such so that when I'm running it at high voltages they don't burn out.
Looking forward to the OP's schematic being posted on this one.
Oh boy... I'm not very good at schematics, but I'll try. Give me a bit.