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-   -   small superbright green LED panels? (http://www.chiefdelphi.com/forums/showthread.php?t=154327)

BitTwiddler 27-01-2017 12:02

small superbright green LED panels?
 
We're in a space crunch situation this year. In the past we've used Superbright LED angel rings around our camera for target location. Because of the design of our robot there is not enough height available for a ring at the optimum location for a camera. We're looking for small rectangular (or square) panel LED assemblies to place on either side of the camera lens instead. I have not seen anything like that on the market. If we had printed circuit board development expertise we could probably make one but we don't.
Anybody know of a source of bright (around 200 Lumens) LED panels -in green color- that are around 2" high? If no commercial source exists does anybody have some ideas how we could make them?

JR0405 27-01-2017 12:06

Re: small superbright green LED panels?
 
Buy a roll of adhesive backed led strips and stick them on a board(most can be cut to length and have jumper cables soldered to the end)

something like this

billbo911 27-01-2017 12:19

Re: small superbright green LED panels?
 
You want small and bright? Wow, you want everything don't you?

Well, today is your lucky day! These little spots of sunshine will more than meet your desires. BTW, they are also available in red, blue, warm and cool white.
Partner those LEDs with this LED driver and you will not only be able to light up the target, you will also be able to do it on command!

Trust me on this, wear sunglasses when viewing them directly.

RoboChair 27-01-2017 12:35

Re: small superbright green LED panels?
 
Quote:

Originally Posted by billbo911 (Post 1637085)
You want small and bright? Wow, you want everything don't you?

Well, today is your lucky day! These little spots of sunshine will more than meet your desires. BTW, they are also available in red, blue, warm and cool white.
Partner those LEDs with this LED driver and you will not only be able to light up the target, you will also be able to do it on command!

Trust me on this, wear sunglasses when viewing them directly.

1678 hereby endorses this endorsement! We used these(or something very similar) last year to good effect.

BitTwiddler 27-01-2017 13:16

Re: small superbright green LED panels?
 
Quote:

Originally Posted by billbo911 (Post 1637085)
You want small and bright? Wow, you want everything don't you?

Well, today is your lucky day! These little spots of sunshine will more than meet your desires. BTW, they are also available in red, blue, warm and cool white.
Partner those LEDs with this LED driver and you will not only be able to light up the target, you will also be able to do it on command!

Trust me on this, wear sunglasses when viewing them directly.

Wow! just the ticket. The video made a believer out of me. Seriously cheap too. Thanks much.

Michael Corsetto 27-01-2017 13:34

Re: small superbright green LED panels?
 
Quote:

Originally Posted by RoboChair (Post 1637087)
1678 hereby endorses this endorsement! We used these(or something very similar) last year to good effect.

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 :o

-Mike

BitTwiddler 27-01-2017 14:58

Re: small superbright green LED panels?
 
Quote:

Originally Posted by Michael Corsetto (Post 1637104)
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 :o

-Mike

Thanks for the tip. What burnt out, the LED or the plastic?:)

RoboChair 27-01-2017 15:00

Re: small superbright green LED panels?
 
Quote:

Originally Posted by BitTwiddler (Post 1637159)
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.

billbo911 27-01-2017 15:48

Re: small superbright green LED panels?
 
Quote:

Originally Posted by RoboChair (Post 1637161)
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!

MrForbes 27-01-2017 15:52

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.

Nuttyman54 27-01-2017 17:02

Re: small superbright green LED panels?
 
Quote:

Originally Posted by RoboChair (Post 1637161)
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?

RoboChair 27-01-2017 17:52

Re: small superbright green LED panels?
 
Quote:

Originally Posted by billbo911 (Post 1637178)
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 (Post 1637201)
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).

billbo911 27-01-2017 18:05

Re: small superbright green LED panels?
 
Quote:

Originally Posted by Nuttyman54 (Post 1637201)
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.




MrForbes 27-01-2017 22:47

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.


Coach Seb 01-02-2017 10:58

Re: small superbright green LED panels?
 
Can anyone explain how to connect the LED driver to the RoboRio?

MrForbes 01-02-2017 11:04

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.

Bkeeneykid 01-02-2017 11:07

Re: small superbright green LED panels?
 
Quote:

Originally Posted by Coach Seb (Post 1639009)
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.

billbo911 01-02-2017 12:25

Re: small superbright green LED panels?
 
Quote:

Originally Posted by Coach Seb (Post 1639009)
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.

EASY PEAZY!

snekiam 01-02-2017 17:40

Re: small superbright green LED panels?
 
Quote:

Originally Posted by MrForbes (Post 1639011)
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.

MrForbes 01-02-2017 20:49

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

Tom Line 01-02-2017 21:11

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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