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PCA9685 Issue

Started by dreiman, October 04, 2021, 07:56:14 PM

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I have set up my light show to use the PCA9685 PWM controller. I am having a weird issue and I am not sure why this is happening.

The lights are just flashing. The modulation is really slow and the lights are just flashing. I tested this with incandescent and LED, and I get the same thing.

Anyone have any thoughts?


So you are trying to use a servo controller to control some lights? 

The PCA9685 is designed to control RC servos so it sends out pulses to tell the servo what position it should go to.

Since you did not tell us what type of lights you are trying to control it is hard to recommend the right product.
Using K8-B, Rpi 3b w/PiHat, Rpi 3b+ w/ PiHat, K4-PB


Actually, if you look at the spec sheet from NXP, it's officially listed as "12-bit PWM Fm+ I2C-bus LED controller".  That said, from OUR standpoint, the normal use case is definitely servos and the cheap servo control boards based on the PCA9685.   The "defaults" in FPP are definitely tuned toward the servos.   Most likely the min/max/mid will need to be adjusted (0/2048/4095) instead of the 1000/1500/2000 the servos use.
Daniel Kulp -


Yes sir. That did the trick. i Searched around for a good while and didn't see anything on that. I had thought the ranges were not correct. But that makes sense. 


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