Help using PCA9685 to control LEDs

Projects General Guidance
1

I am using the PCA9685 to control 6 RGB leds, i have 5 of them connected to the PCA9685 and one connected directly to the arduino pwm pins, my problem is how do i use the setPWM(channel, on, off) command in the library of that chip as it looks nothing like the AnalogWrite command, the setPWM has 2 values one for off and one for on and they range between 0 and 4096 while the arduino pwm pins range between 0 and 255 and they only take in one value per pin not 2.

How do i make them equivalent using variables in the code?
Thanks.

2

which library are you using? The one in the library reference just specifies the duty cycle, not on and off time.

Either way, this chip deals with 0-4096 which is just your analogWrite() value [0--255] times 4.

3

Post a link to that LED connected directly to the controller I/O. It might be a bad idea.

4

I’m using the library by adafruit

5

I have a bunch of resistors between the chip and the leds

6

You give no useful information, no code, no wiring so I give You no help.

7

I agree and no links to the parts!

8

Are these LEDs common <=20mA indicator LEDs ?

Why did you choose the PCA9685.
Wouldn't it be easier to use addressable LEDs.

Please tell us more about your project.
Leo..

9

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