Hi, I need to sense a DIM 220v signal, and then depending on the % of the signal, generate a PWM signal on 12v. I don't know anything about electronic, it is possible to find any way?
PasZ
Can you explain your problem please, not how you think you need to solve it?
What is a "DIM 220V" signal?
AC?
DC?
AWOL:
Can you explain your problem please, not how you think you need to solve it?
What is a "DIM 220V" signal?AC?
DC?
Hi AWOL, what I need to know is which percent of a 220v AC is dimmed before with a Control4 Dimmer(Domotic), then Im going to use that % to generate a PWM to dimm a LED strip.
PasZ
If you don't know what you're doing, I'd advise against the mains side of things.
It isn't as simple as a straightforward percentage of a fixed voltage.
If you need to dim the low voltage in sync with the mains, it would be simpler to swap the dimmer's pot with a double-ganged potentiometer, and read that separately.
Still pretty dangerous for someone with no experience though.
AWOL:
If you don't know what you're doing, I'd advise against the mains side of things.
It isn't as simple as a straightforward percentage of a fixed voltage.
If you need to dim the low voltage in sync with the mains, it would be simpler to swap the dimmer's pot with a double-ganged potentiometer, and read that separately.
Still pretty dangerous for someone with no experience though.
What I need is to DIM a 12v Led Strip with my Control4 Dimmer Module.
What does the Control4 Dimmer Module do? It Dimm a 220v AC (and it sincronize himself with the system and you have the posibility to control it with an iPad or a TouchScreen).
So I connect:
220v to the Control4 Dimmer Module, and the I need an interface to check the tension and transform it in a 12v PWM.
If you don't understand my english, tell me, its very little.
PasZ
What does the Control4 Dimmer Module do?
It chops the mains signal - it doesn't simply reduce the amplitude.
The software to read and work out the dimming isn't simple.
Why not get rid of the mains altogether and simply control the low-voltage side with a pot and PWM?
AWOL:
Why not get rid of the mains altogether and simply control the low-voltage side with a pot and PWM?
Because with that solution I do not have feedback at the system.
PasZ
If I understand what you are trying to do, might it work to just use a 12 volt power supply which is connected to your control4dimmer?
Hi,
This does not need to be so dangerous if you use an optoisolator (AKA optocoupler) to sense the 220V signal and then monitor its output with Arduino.
I think you have a 220V 50 or 60 Hz dimmer that does "Phase Control" dimming of a 220V lamp, right?? (You need SOME load on this even if it is a small bulb).
So an optocoupler connected to the "dimmed" circuit will see the width of the "on time" change with dimming: full width every 1/2 cycle at max, getting down to a small width value at min.
You should be able to measure this with PULSEIN in Arduino.
This can be dangerous connecting to mains, especially 220V! SO make sure you understand how to connect carefully.
Google "optoisolator zero crossing 220V arduino" and go from there, or continue the discussion here...
bilbo:
If I understand what you are trying to do, might it work to just use a 12 volt power supply which is connected to your control4dimmer?
Yes, if you can tell me where can I find a 220v to 10v with PWV dimmer, it would be perfect!
Hi, yes I have a 60/50Hz 200v dimmer, I supouse that does Phase Control. The default use is dimming a 220v lamp, but we need to dimm a Led Strip that its dimmed with 10v PWM
The little that I know of a optocoupler, I supouse that you cant sense a dimmed signal, but... if you say, it would be like that!
PasZ
Take a look here: http://knol.google.com/k/electronic-circuits-design-for-beginners-chapter-16#
The point is that during each cycle the dimmer turns the power on sooner or later each cycle to control the dimming. An optoisolator (with appropriate current limiting resistor for 220V!) will see the full cycle (actually 1/2 cycle) ON at full brightness, and smaller and smaller times as the lamp is dimmer, and almost zero or actually zero at fully dimmed.
The TRIAC is triggered at different "phase angles" for different dimming.
So you should have an output that varies from off or very short up to 1/2 cycle at 50 or 60 Hz...
Make sense??