Meanwell LDD driver: for those who want to dim to 0 using Arduino
- Thread starter pwreef
- Start date
rrasco
Active member
No problem guys. Glad I could help.
What shipping method are you choosing? That's my problem, I chose the cheap one so it took forever to get here. Probably on the slow boat. I keep forgetting about that. I need to order some other boards anyways, so it would be nice to have a week turn around.
What shipping method are you choosing? That's my problem, I chose the cheap one so it took forever to get here. Probably on the slow boat. I keep forgetting about that. I need to order some other boards anyways, so it would be nice to have a week turn around.
I always pick the UPS shipping option and normally get my boards in 8-9 days. It's funny that you ask- I just got an Email from SeeedStudio customer service claiming that they never received my gerber files. I replied to them with their own email confirming that my files were received by them and were going into production. Rather than play games with them- I asked for a refund, and let them know that I'll be using IteadStudios from now on.
Whitebeam
New member
Yep. PWM = Pulse Width Modulation - the clue is in the name. My LDDs work perfectly with the Arduino Uno over 0-255.
Peter
LargeAngels
Premium Member
I chose the slow boat this time. I'm in no hurry as I've got plenty of CATs up and running. Now to find a cheap pcb mount AC/DC power supply and make a nice compact system.
rrasco
Active member
Let me know what you find. I've been using variable output universal laptop power supplies. They are like $15 on ebay and come with all the DC barrel sizes.
Not an electronics guy so I will ask all the stupid questions
I use ELN 48P's in the current setup which takes a 0-10V to be applied to the dimming circuit. Initially I applied the PWM from the arduino directly and leds appeared dim. So everyone told me I need a 10V signal and that did help, the LEDs are very bright.
So my understanding from that class is, although the PWM duty cycle could be 0-255 it only cycles the voltage that is being applied. so we could cycle from 0-255 using an arduino but a 5V at 255 will provide the same intensity as a 10V at 125 :worried:
rrasco
Active member
I think that is partially correct.
From my understanding, let's say we are using a 5V PWM signal. If you send that a 50% duty cycle (128 of 255), it will still send 5V, but the pulse width is at 50%, so your voltage reading would be half of 5V, however, in reality, a full 5V is still being sent. At least that is how it has been explained to me.
From my understanding, let's say we are using a 5V PWM signal. If you send that a 50% duty cycle (128 of 255), it will still send 5V, but the pulse width is at 50%, so your voltage reading would be half of 5V, however, in reality, a full 5V is still being sent. At least that is how it has been explained to me.
dwolson2
New member
Thats how I understand it as well. The only catch to that is some drivers can run off of all three types of dimming. But if were only analog, if the ardiuino sends out 5 v, you get 50% power, 10v, 100% power.
one clownfish
Member
If anyone orders extra boards and they want to sell them please keep me in mind. I have no idea how to send a Gerber or any other file to a board house. Heck, I can't even open the zip file, an error comes up,lol. If not, I'll just get the wired ones. It won't be as clean/nice but they will get the job done.
rrasco
Active member
Yes. Looking at the data sheet, they are all the same size.
http://www.meanwell.com/search/ldd-h/default.htm
http://www.meanwell.com/search/ldd-h/default.htm
one clownfish
Member
How do we protect the LDD's from getting to much current? Lets say we have a board with 4 LDD'S on it driven with a 4amp PS. One LDD goes bad and now the remaining 3 are over driven by .33ma. How much over current protection is there before the remaining 3 burn up or if one fails the whole board goes down?
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rrasco
Active member
That's what the drivers are for: to draw and supply the appropriate amount of current. You don't actually want to get a 4A power supply to power four LDD-1000H. Power supplies are not 100% efficient, so you should oversize it a bit. And if they are running at capacity, they will get hotter. I'm running two LDD-600D on a laptop power supply that's rated at 3A or 3.5A. The driver only pulls what they need.
one clownfish
Member
Thanks, thats great. I might be going on a limb here but I'm guessing it doesn't matter if you mix the 700 and 1000 series LDD on the same board, right?
one clownfish
Member
Double post
I hope it is okay for me to post this here vs starting a new thread since everyone is doing this project. If it not okay... please be nice :fun2:
I have a setup but would like verification I did my HW right.
Materials:
--------------------------- Based on Max voltage out from spec sheet/websites
44 RB XT-E --------------- 11 per driver, 3.4v
11 Blue XP-E ------------- 11 per driver, 3.5v @ 1000mA
11 NW XP-G -------------- 11 per driver, 3.25 @ 1000mA
11 WW XP-G ------------- 11 per driver, 3.25 @ 1000mA
11 Deep Red rebel ES ----- 11 per driver, 2.4v @ 700mA
11 Cyan rebel ES ----------- 11 per driver, 3.5v @ 1000mA
11 Violet - rapidled -------- 11 per driver, 4v @ 700mA
Plus
4 RB XT-E - Moonlight over two tanks --- 4 per driver, 3.4v
60 Deep Red rebel ES - scrubber setup --15 per driver, 2.4v @ 700mA
9 - 1000mA LDD-H driver
6 - 700mA driver LDD-H
2 - HLG-320H-48 Power Supply (48v 6.7a 321.6w)
Either 2 O2surplus 10x10 boards or 4 Rrasco 5x10 boards
1.) Will the two PSU's be able to power multiple boards, the drivers and LED's. If I calculated everything right the PSU's has the power. However, unsure on how to connect the power supply to multiple boards unless I splice the wires.
I have a setup but would like verification I did my HW right.
Materials:
--------------------------- Based on Max voltage out from spec sheet/websites
44 RB XT-E --------------- 11 per driver, 3.4v
11 Blue XP-E ------------- 11 per driver, 3.5v @ 1000mA
11 NW XP-G -------------- 11 per driver, 3.25 @ 1000mA
11 WW XP-G ------------- 11 per driver, 3.25 @ 1000mA
11 Deep Red rebel ES ----- 11 per driver, 2.4v @ 700mA
11 Cyan rebel ES ----------- 11 per driver, 3.5v @ 1000mA
11 Violet - rapidled -------- 11 per driver, 4v @ 700mA
Plus
4 RB XT-E - Moonlight over two tanks --- 4 per driver, 3.4v
60 Deep Red rebel ES - scrubber setup --15 per driver, 2.4v @ 700mA
9 - 1000mA LDD-H driver
6 - 700mA driver LDD-H
2 - HLG-320H-48 Power Supply (48v 6.7a 321.6w)
Either 2 O2surplus 10x10 boards or 4 Rrasco 5x10 boards
1.) Will the two PSU's be able to power multiple boards, the drivers and LED's. If I calculated everything right the PSU's has the power. However, unsure on how to connect the power supply to multiple boards unless I splice the wires.
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one clownfish
Member
You might want to start a build thread but your drivers are the wrong type. Your going to want a Meanwell SE-350-48 or a Meanwell NES-350-48 or Something along those lines. The drivers you listed are controllable.
