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Topic: analog out 0-10V With Arduino for lighting control (Read 16064 times) previous topic - next topic

admin

I use a simple lm358 configured as a x2 amplifier

with an rc filter I smooth out the arduino PWM signal then i feed it into the amp powered at 12v
if you dont have motors connected to the arduino, you can increase the pwm speed and get smoother signals
i get pretty good results

massimo

Othersounds

I try the Delta schematics with the LM324N. Works fine!.
Many thanks to all for the help!
F
Felix Luque Sanchez
http://www.othersounds.net

Othersounds

Hi,
I just wanted to know if someone can confirm that the delay I'm getting when dimming a 0-10V ballast is normal (has nothing to do with the arduino). I'm using a Philips HF-R 118 TL-D (18w). This ballast makes big fades when diming the tube, so I can't make quick transitions. You can see the delays I'm talking about in this youtube video:
http://www.youtube.com/watch?v=s1AjLvUJJeE
Has anyone better results? Maybe with Osram dimmable ballast or with other brands and models?
Any comments are welcome ?
F
Felix Luque Sanchez
http://www.othersounds.net

sv1eed

The delays seem normal, if you are using big capacitors for the RC filter.

i was wondering...
as for the initial 10V question, if we power the arduino with an external 12V, why cant we just get the pwm to drive a small npn transistor, powered by the 12V VIN pin?
the dimmable ballast application does not need great linearity. is there another issue i am missing?

retrolefty

Quote
is there another issue i am missing?


No, that should work. However as already posted, using a single common emitter transistor will result in a reversal of control action. That is at 0% duty cycle in software the control voltage will be full Vin voltage output and 100% duty cycle will result in near zero voltage output. Just makes the software a little more tricky, but not that big a deal. Biggest concern is if Vin is over 10vdc then the control voltage to the ballast will also be over 10vdc, does this cause any harm to the ballast controller?

Lefty

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