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Unread 27-01-2017, 14:58
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Re: small superbright green LED panels?

Quote:
Originally Posted by Michael Corsetto View Post
Can confirm, these are the LED's we used in 2016. Pro tip, mount them to a piece of metal, or plan some other method of heat dissipation. We first had one mounted to a piece of plastic, and it burnt out pretty quick

-Mike
Thanks for the tip. What burnt out, the LED or the plastic?
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Unread 27-01-2017, 15:00
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Re: small superbright green LED panels?

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Originally Posted by BitTwiddler View Post
Thanks for the tip. What burnt out, the LED or the plastic?
The LED. They need something with good thermal conductivity to keep pulling the heat out of them. But that can be as easy as mounting it against some aluminum.
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Unread 27-01-2017, 15:48
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Re: small superbright green LED panels?

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Originally Posted by RoboChair View Post
The LED. They need something with good thermal conductivity to keep pulling the heat out of them. But that can be as easy as mounting it against some aluminum.
If you really want to make certain to conduct the heat out, ad a dab of thermal compound.
These baby's get hot enough to make you think twice before touching them a second time!
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Unread 27-01-2017, 15:52
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Re: small superbright green LED panels?

Dave, we used the white version of those LEDs on our underwater ROV Babs. They work pretty well. Heat sink...we want a heat sink..but we have some aluminum we can use to make that.
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Unread 27-01-2017, 17:02
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Re: small superbright green LED panels?

Quote:
Originally Posted by RoboChair View Post
The LED. They need something with good thermal conductivity to keep pulling the heat out of them. But that can be as easy as mounting it against some aluminum.
What did you use to mount it? As far as I can tell, they don't have any mounting holes per-se. Presumably you'd want something that is a good thermal conductor. I could see using bolts through the cutouts in the star, but I'd be worried about putting stress on the PCB that way. Or zip ties through the star loops and thermal paste between the PCB and the aluminum?
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Unread 27-01-2017, 17:52
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Re: small superbright green LED panels?

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Originally Posted by billbo911 View Post
If you really want to make certain to conduct the heat out, ad a dab of thermal compound.
I just want it on record that I think thermal paste is just about the messiest thing in existance. It's good at what it does, but it's also evil. Not even GoJo can get all of it off.

Quote:
Originally Posted by Nuttyman54 View Post
What did you use to mount it? As far as I can tell, they don't have any mounting holes per-se. Presumably you'd want something that is a good thermal conductor. I could see using bolts through the cutouts in the star, but I'd be worried about putting stress on the PCB that way. Or zip ties through the star loops and thermal paste between the PCB and the aluminum?
I think we used safety wire, but zip ties will work as well. Bolts would work fine as long as you torque them correctly(i.e. have someone that knows their bolts and doesn't have the desire to tighten till it cracks, back a quarter turn it).
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Unread 27-01-2017, 18:05
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Re: small superbright green LED panels?

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Originally Posted by Nuttyman54 View Post
What did you use to mount it? As far as I can tell, they don't have any mounting holes per-se. Presumably you'd want something that is a good thermal conductor. I could see using bolts through the cutouts in the star, but I'd be worried about putting stress on the PCB that way. Or zip ties through the star loops and thermal paste between the PCB and the aluminum?
Evan, we've used these LEDs in a couple configurations. If properly spaced, a pair of 4-40 screws works great. I would avoid using nylon screws as the nylon might melt. The "PCB" is actually aluminum. The LED sits on a flexible circuit board that is adhered to the aluminum sub-straight. Here's a couple pictures from my collection of these little guys. In the second image, you can see the aluminum back easily.



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Unread 27-01-2017, 22:47
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Re: small superbright green LED panels?

We used 4-40 screws with a nylon washer under it, and insluating material between the aluminum LED base, and the chunk of aluminum they are attached to. This is in Babs, aka Stanford in the movie Spare Parts.

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Unread 01-02-2017, 10:58
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Re: small superbright green LED panels?

Can anyone explain how to connect the LED driver to the RoboRio?
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Unread 01-02-2017, 11:04
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Re: small superbright green LED panels?

get a Spike relay, and use it to switch power on or off, if that's what you are trying to do.
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Unread 01-02-2017, 17:40
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Re: small superbright green LED panels?

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Originally Posted by MrForbes View Post
get a Spike relay, and use it to switch power on or off, if that's what you are trying to do.
Spikes are no longer sold - so long as you are not using it to control motors or other actuators, you can get an off the shelf relay for controlling any sort of lights on your bot.
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Unread 01-02-2017, 20:49
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Re: small superbright green LED panels?

Thanks for the update on Spikes...we have been using them for a long time, and have plenty, so I wasn't aware that you can't buy them.

Also interesting about the power supply, that makes life easy
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Unread 01-02-2017, 21:11
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Re: small superbright green LED panels?

Depending on the current draw, you may be able to use the PCM to power these. I'd have to verify the legality of that for a competition robot thought. I believe the PCM can source around .6 amps for relays.
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Unread 01-02-2017, 11:07
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Re: small superbright green LED panels?

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Originally Posted by Coach Seb View Post
Can anyone explain how to connect the LED driver to the RoboRio?
The RIO won't be able to provide enough current to drive one of these directly. If you want the ability to turn the LED on and off, you'll need to use a relay module. The only legal one is the Spike. IF you're not worried about that current draw, you can just plug them straight into the PDP.
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Unread 01-02-2017, 12:25
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Re: small superbright green LED panels?

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Originally Posted by Coach Seb View Post
Can anyone explain how to connect the LED driver to the RoboRio?
If you use the LED driver in the link I provided, connection to the RoboRio is very simple.
Because the driver is a constant current source, you can provide power to it directly from the PDB, there is no need to use a VRM to power it.

The connection to the RoboRIo is as simple as connecting the "CTRL" (D+), these are the dimmer inputs, input on the LED Driver to a digital out on the RoboRio. There is no need to connect the "DGND"(D-) as GND is provided by the power GND.
Setting the digital output low turns the LED off, and high turns it on.

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