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1  Using Arduino / LEDs and Multiplexing / Re: Driver recommendation on: April 11, 2013, 03:27:46 pm
So, for my case, I can turn it all the way down. Thanks for the help!
2  Using Arduino / LEDs and Multiplexing / Re: Driver recommendation on: April 11, 2013, 01:12:23 pm
I was leaning towards the 15P, thanks for the confirmation.

Any insight into what the "Voltage Adjustment Range" spec on the datasheet means? It's in the same table as the "LED Operation Voltage"

On the 15P, VAR is 13.5~16.5 (This was my only concern, as this is above the 13.2V the LEDs will take.)

I just got the bright idea to email Meanwell customer service. I'm betting on the 15P, but I'll report back either way.

Thanks for all the replies!

EDIT: BONUS ROUND! I dono how electricity works; do I need to adjust the voltage the driver provides, or will the LEDs only suck out as much voltage as they need? (There are both voltage and current trim pots in the driver)
3  Using Arduino / LEDs and Multiplexing / Re: Driver recommendation on: April 10, 2013, 01:52:41 pm
I think I might have not worded my original post well enough. The arduino is only used to engage the dimming function of the drivers, using PWM.



My question is; to power 4X LEDs 3.3V@350mA, which driver should I use.

I had a side question, asking if the arduino could supply power to this string, instead of using a driver, and maybe that's what you're referring to. I assume that's not possible, but figured I would ask.
4  Using Arduino / LEDs and Multiplexing / Driver recommendation on: April 10, 2013, 09:31:04 am
I want to drive 4 of these LEDs http://www.rapidled.com/royal-blue-moonlight-led/
3.3V @350mA

I want to use PWM from the arduino for dimming.

It's going into a fixture with 3 other drivers form the ELN60 line (1X 48P, 2X 27P) http://www.meanwell.com/search/eln-60/ELN-60-spec.pdf

I chose the other 3 because they were recommended by the website I'm buying the LEDs from. I would guess I could use the ELN60-12P, Which is $24. Would be nice to keep the footprints consistent, so if this driver is a suitable option, I would prefer to use it. I'm just not completely confident in my knowledge, so I figured I should ask.

Also thought it might be possible to just drive them from the arduino its self? I don't know.

EDIT: I'll keep looking, but I guess I just don't know how to look at the spec sheet to see what I need. I have 4X 3.3V@350mA, so I need 13.2V @ 350mA, right? There are two sections on the spec sheet that talk about voltage output; LED Operation Voltage, and Voltage ADJ Range. Could someone explain these further? My 13.2V lands within LED Operation Voltage on the ELN-60-12P, but in Voltage Adjustment range of the ELN-60-15P

5  Using Arduino / Project Guidance / Re: Doubling PWM voltage (For LED Driver) on: April 10, 2013, 08:10:43 am
I tried a few different loads, 1K 4K7 and 10K I think.

Should I start a new thread for my hardware (Drivers, connectors, wires, housing, etc.) stuff? I'm putting together some drawings now, but I want a critique before I go buying stuff.

Thanks!
6  Using Arduino / Project Guidance / Re: Doubling PWM voltage (For LED Driver) on: April 06, 2013, 06:51:37 pm
Hey! It worked!
                                                                                                                                                                                                   
I'm at 9.82 with 3 diodes, I think that should be good, no? My other option is 10.44

I was kind of surprised that I could measure the -.62 across the diode... I think I have no idea how electricity works.

Now onto hardware design. This is so exciting!
7  Using Arduino / Project Guidance / Re: Doubling PWM voltage (For LED Driver) on: April 05, 2013, 01:47:59 pm
Ahh, of course, absolutely. I knew I understood you at first, then i made the drawing, then i guess I forgot what I understood in the first place. Got it, will report back in a few hours (Maybe... I think the girlfriend wants to go on a date tonight...)
8  Using Arduino / Project Guidance / Re: Doubling PWM voltage (For LED Driver) on: April 05, 2013, 08:33:03 am
Ahhhhh, okay!
I'll try it when I get home! Hopefully I can get this working this weekend.

Thanks!

EDIT: To be clear, is this what you mean? http://imgur.com/Xf9W8wo Of course, the driver won't be hooked up yet ('til I know this is correct)

Actually, I don't understand the difference between what I did on the breadboard, and this drawing. Picture 4 (should be 5) showed this...
9  Using Arduino / Project Guidance / Re: Doubling PWM voltage (For LED Driver) on: April 04, 2013, 08:06:30 pm
Sorry for the long delay, I was sick all of last week, and I'm just now getting everything back in order... So lets get into this so we can figure out how I'm screwing everything up =)

I ripped my breadboard apart, and started over. First thing first, getting Vin down from 11.9V to 10V

Here's a gallery showing my set-up. Vin->IN4003->IN4003->Resistor (A 4K7 is pictured, but I also used a 1K and 10K with the same results)
Pictures 4 and 5 are swapped around in the gallery, but they're meant to show that the load doesn't change voltage.
http://imgur.com/a/Awx8u

I'm not sure if I'm measuring right, I dono, I'll let the pictures speak for themselves...

Thanks! I'll do my best to reply to any questions as quickly as possible.
10  Using Arduino / Project Guidance / Re: Doubling PWM voltage (For LED Driver) on: March 25, 2013, 11:59:47 am
I did a 1k resistor, I'll try a 4.7K tonight.

To double check that I'm doing this right, the "load" resistor goes where my driver would go, right? And I measure voltage between the resistor and ground?
11  Using Arduino / Project Guidance / Re: Doubling PWM voltage (For LED Driver) on: March 24, 2013, 04:55:41 pm
I picked up some IN4003 diodes, in series between Vin and the resistor, but they're only dropping the voltage by 0.3V each. Don't really want to put 5 diodes on each of these.

Anyone have any ideas? (Either about why the diodes aren't working properly, or other options to drop from 11.6 to 10)
12  Using Arduino / General Electronics / Re: LM317 not working as expected on: March 24, 2013, 01:30:20 pm
Awesome links. Loving the charts, calculating resistance values is becoming my most hated aspect of electronics.
13  Using Arduino / General Electronics / Re: LM317 not working as expected on: March 23, 2013, 08:50:28 pm
Lefty, Alright, i'll be picking up some diodes tomorrow and we'll see how it goes. Thanks.

Afremont, after reading your post at least 5 times, I still mostly don't understand anything, but it sounds scary. Someday I'll understand, thanks for trying to educate me!
14  Using Arduino / General Electronics / Re: LM317 not working as expected on: March 23, 2013, 07:26:01 pm
I should probably stop posting to this thread, as the question was answered and it's sidetracking now.

Through testing different R2s, I see that when Vin-Vout>3, the regulator works normally, so I'm just using it wrong.

Feel free to join in on my project guidance post, though.
15  Using Arduino / Project Guidance / Re: Doubling PWM voltage (For LED Driver) on: March 23, 2013, 07:21:19 pm
Mike, ahh okay, yeah I see the difference. Hey, I did something right!

Lefty, I wasn't sure what to do 'cause this post is about the project, but I had another question about a piece of hardware not working how I expected it to. So... project here, hardware in hardware.

A mod should probably just delete both of these and i'll start over... =\
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