Meanwell LDD driver: for those who want to dim to 0 using Arduino

[one clownfish]

I'd like to get my hands a couple of those pcb's too.

 

[007Bond]

Thanks Synodontis,...I took a peak at Dmx controllers when you first posted. I see they very in price range quite a bit. That's as far as I went. I'll have to read some more. I assume these are what guys are using to control all that fancy moving led Christmas lighting on their homes with. You caught my attention with controlling the lighting remoltly from your laptop, and it sounds like you could incorporate other things also. Please post updates as you move forward with your build, or better yet start a thread,...usually get others chiming in that have experience.---RICK

 

[pwreef]

Check this one out. This is for a projector like Kessil. Not for sale yet, but should be awesome.

 

[nettraptor]

Hello guys

my friend and i having some big issues with the LDD meanwell and arduino mega
we have

two power supplies 48v/6A connected to 12 ldd drivers.
Each driver is connected to 14 led strings (xte white & blues).
During power up the system , all leds at full, there is no noise at all.
During dimming a annoying noise (likes bees) is coming from ldds

i changed the frequensy with this library http://code.google.com/p/arduino-pwm-frequency-library/downloads/list
to 70hz , now is better but not what we are looking for , are we missing something?

Please Help.

 

[n2585722]

They do make a high pitch noise. But it is hard to hear over the fans other devices running on my system.

 

[asid61]

View attachment 251130
Check this one out. This is for a projector like Kessil. Not for sale yet, but should be awesome.

Looks sketchy. How is heat being dissipated? Not heatsinking, but getting heat from the led board to the heatsink. Is the MCPCB made of copper or aluminum?
On the other hand, I can see a ton of work probably went into that. Incredible PCB layout.

 

[pwreef]

Sketchy, huh. Well my research and past track record of that designer shows that this Sputnik will fly first again. Way before Cupertino. Gooo USA!

 

[stu.uk]

I am looking to make 2 builds, 1 with 5 LDDs and 1 with 10. What boards would people recommend i use and would i better to split the LDDs between more boards for better heat spread or does it not make much of a difference?

 

[nemosworld]

I am looking to make 2 builds, 1 with 5 LDDs and 1 with 10. What boards would people recommend i use and would i better to split the LDDs between more boards for better heat spread or does it not make much of a difference?

3 5-up ldd boards sounds just about right for your application/s.

 

[stu.uk]

Excellent thank you, now just to find the files! I am correct in that the resistor drives the LDDs and ultimately LEDs to off?

I take it heat isn't any different in the different board configs?

Also, i'm guessing the 5 up boards are on 10 x 10 boards, 1.6mm thick?

 

[stu.uk]

Not to worry found the files and confirmed board size. Handy to have all the ITEAD files already in a zip file too, nice and easy to send

 

[kapelan]

Hello guys

my friend and i having some big issues with the LDD meanwell and arduino mega
we have

two power supplies 48v/6A connected to 12 ldd drivers.
Each driver is connected to 14 led strings (xte white & blues).
During power up the system , all leds at full, there is no noise at all.
During dimming a annoying noise (likes bees) is coming from ldds

i changed the frequensy with this library http://code.google.com/p/arduino-pwm-frequency-library/downloads/list
to 70hz , now is better but not what we are looking for , are we missing something?

Please Help.

http://www.reefcentral.com/forums/showthread.php?p=22006471#post22006471

 

[acron]

Hi all,
first of all I apologize for my bad english
I have a problem with these drivers
Each driver (in total 4) is powered at 48V-8A with a meanwell power supply and to each are connected 12 led cree in series, all are controlled by a single PWM output.
The problem is that during the fading hear a slight hum (I do not know exactly where it comes from, seems around to the LEDs)
I already tried to change the frequency up to 1kHz but the buzz remains the same. I have an arduino Mega1280.

The other tests I've done with no results are:
- I disconnected everything and connected only one driver and the related LED PWM separating the signal from the power.
- I unplugged the LEDs from the heat sink
- I connected a capacitor on the output of the power supply
- Twisted wires for power supply


How can I fix? Advise me anything, even the most banal


Thank you!

 

[fefegarcia1]

Hi!

You have all GNDs of the power supplies connected with Arduino GND?

Fernando Garcia

 

[acron]

I have only one power supply 48v and its negative is connected to Arduino gnd

 

[asid61]

I have only one power supply 48v and its negative is connected to Arduino gnd

Can you make the frequency even higher than 1000Hz?

 

[acron]

already done

 

[letoan]

Does the -Vout from the LDD needs to be isolate or I can treat them as a common ground?

 

[pwreef]

Each Vout (-) from each LDD needs to be connected only to the string lit by that LDD. Do not connect them to common ground or to each other.

 

[letoan]

Each Vout (-) from each LDD needs to be connected only to the string lit by that LDD. Do not connect them to common ground or to each other.

Thanks pwreef.