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Topic: Power LED Shield V2 (Read 25385 times) previous topic - next topic


Jul 20, 2011, 12:25 am Last Edit: Jul 20, 2011, 12:46 am by koyaanisqatsi Reason: 1
Power LED Shield V2 is now available at Chester's Garage!


I'm still working on documentation and it should be available in the next few days.

The shield is available with a variety of driver sizes, ranging from 350mA to 1200mA, or without drivers if you want to install your own selection.  Any combination of driver sizes is supported.


I'm planning a project to modify my floor lamp to use RGB LEDs. I'm using this lamp:

For this project, I'm considering using the Power LED Shield to power one, preferably two of these RGB LED plates:

The green and blue channel require at least 32V, so it seems I need to find a 32V power supply. Unfortunately, I only need three channels, one for each color, so I'm not sure what to do with the four channel. Maybe I'll use it to power a white LED assembly.

Will I be able to power two of these RGB plates with one shield? If not, can two stacked shield share the same power supply?

For 32V, I think I can't use a laptop DC adapter as those supply only 24V. Any recommendations for those?


Aug 14, 2011, 07:55 pm Last Edit: Aug 14, 2011, 08:02 pm by TheDOdblG Reason: 1
One of the many good things about the V2 is you don't have to fully populate the shield in order for it to work.  You can have 1, 2, 3 OR 4 per shield.  So really, you don't have to use all 4 channels, but it's there in case you want to.  You could in fact use the 4th channel for a cooling fan, and use a temp sensor such as the DS18B20 to monitor you LED's temperture to control the fan via PWM through your Arduino.  That's what I would do, use Channels 1-3 for the LEDs, and Channel 4 for the fan.

This is the power supply I used with the V2's:

The V2 uses RECOM drivers, so it will accept Power Supplies up to 36V.  Many more PSUs that fit your needs are available at http://wattsupply.com/s.nl/sc.30/category.2200/.f

Both of these sites you will have a hard time beating their selection, price, and service.  Enjoy!


I can't guarantee the Power LED Shield will drive those LEDs.  The site is light on spec data, but the info posted by others suggests they _could_ work.  The Power LED Shield can handle up to 36V input voltage and can deliver up to 33V to the LEDs.  As long as you don't get one that needs more than 33V on any of the colors, you should be OK.  But it will be close.  The 36V supply linked by TheDOdblG would work well.

You can't (at least you _shouldn't_) drive something like a fan with the LED drivers.  They are constant current drivers and will push as much voltage as necessary to achieve the desired current.  Fans and most other electrical devices require a specific voltage and will draw as much current as necessary to do what they need.  LEDs are "different" in that they require a constant current value at whatever voltage is necessary to obtain the current.  This is why LEDs are sometimes rated with a range of voltage rather than a specific voltage.

I have another product coming soon that controls fans and has the DS18B20 and a real time clock too.  It's for aquarium and similar projects.

You can order the Power LED Shield with any combination or number of driver modules.  My site doesn't show it because it would be a zillion different options.  But email/PM me if you want to order a board with a custom selection of drivers.

I'm really happy to see that link to wattsupply.com.  I have had a hard time finding sources of 36V supplies.  They seemed so common when I started designing the V2 board.  But once I released it, I couldn't find the 36V supplies as easily!



Are there limits to how far away the LEDs can be from the Power LED Shield? (I seem to recall that a BuckPuck wants the LED to be 6" away max.)


Hi 8bar,

The RECOM Power data sheet for the RCD-24 driver modules does not indicate any wire length limits. You will need slightly thicker wire for longer runs though.  Below is an article that gives some suggestions on wire sizes, based on the distance between the driver and the LEDs (at the bottom of the article):

Also see the data sheet for the RECOM Power RCD-24 drivers used on the Power LED Shield V2:



Thanks for the links. I assume that if I use the analog dimming mode, that my distances to the LED can be much longer than with PWM dimming.


That is probably true, due to capacitance and inductance in the longer wires.  But I haven't tested anything in PWM dimming mode beyond a few inches.  My desk lamp is a conversion from halogen and the LED is maybe 4 feet from the driver module electrically (the LED power runs through the lamp parts).  It has consistent brightness in both high and low modes, using analog dimming.

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