using the PCA9685 16 channel to dim regular 2-pin LEDs

Other Hardware LEDs and Multiplexing
1

noob question, I know.
I'm setting up a 16 channel LED build (which will eventually be using the Meanwell LDD drivers and CREE Leds).
But in the meantime, I JUST received my adafruit 16 channel PWM/Server board (the PCA9685 based one) and I'm starting to play with the PWM dimming code.

I assumed that I would be able to -- for testing -- be able to connect some of those cheap 2 prong (cathode/anode) LEDs to the board to test my PWM code.

I've got the 3.3v feeding the PCA9685 board's PWM, and I'm hooking the ground back to ground.

Wouldn't the 3.3v PWM be enough to give me an indication to how my code is working? As it stands, the LEDs don't light up at all.

2
  1. you need a resistor in line with those LEDs.
  2. you need to connect the anode end to +ve and the cathode to the PCA9685 board's outputs.
  3. you need a resistor in line with those LEDs.

See page 28 of the data sheet. You need INVRT = 1 OUTDRV = 0

3

Grumpy_Mike:
See page 28 of the data sheet. You need INVRT = 1 OUTDRV = 0

I haven't actually seen the data sheet off of the Adafruit website. Can you repost the link here?
(and thank you, by the way)

4

Just google
PCA9685 data sheet