I have a huge cool project going on. Going to have my whole appartment fitted with LED downlights, and im planning to controlling(dimming) all of the downlights invidually. Have gotten a lot of help from another on another forum, but now im stuck at a problem. First the facts, then the problem.
Driver: 320mA, 3W, about 9v-10v
Ardurino Uno. and the PCA9685 on the schematics are the Adafruit 16-Channel 12-bit PWM/Servo Driver
When i set the frequency of dimming to 500Hz and start dimming, the driver makes a loud buzzing sound. but only when its dimming or not at max or mix. if setPWM is 0 or 4096 its quiet. What is making this sound. Tryed fitting a capasitator between the positive and ground on the driver output, but did not help. The sound gets louder the higher frequency i set on, but the LED is starting to flash/flicker under 200Hz.
I also did not have this problem when i tryed dimming the LED with PWM directly from Ardurino.
Very gratefull for all help.
For refrence the old forum thread on the other forum that helped me with the procject is here: http://www.electro-tech-online.com/elec ... sject.html