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Topic: Using Solid State Relays with PWM on an Incandescent Bulb - Wiring Help Needed (Read 8 times) previous topic - next topic


brendanwilding

Out of curiosity, if the PWM frequency was changed to something much lower, say 30Hz, would it then be possible to control the intensity via PWM? I understand its probably not going to be perfectly 'in-sync' but if the fading is fast it shouldn't matter?

You can change the arduino PWM frequency quite easily (http://www.arduino.cc/playground/Code/PwmFrequency), however I have only tried increasing the PWM in the past.

be80be

You could use The PWM but it doesn't work well at all.
It's like this I tried this years ago what happens is some times you'll get a 1/2 off light next time its 3/4  then the next it jumps to off and you can see it like flickering.

Now with zero crossing you can make it soft and slow change without flickering.

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