LEDs and enclosures

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#1
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Hi All

 

This is a simple question as I would like to know anyone has experience with a particular LED range or size.

 

I aim to place a PCB in an enclosure, I want to avoid making any holes in the enclosure for the LED to shine.  I have noticed from an initial experiment if the enclosure wall thickness is thin and if the plastic color is light, the led inside can still provide some light to shine to the outer wall. These LEDs I tested were axel-legged versions from amazon but do not that any spec information on them.

 

Has anyone else used LEDs in such way?

 

I would like to know is there a recommended package to use or a certain type of LED?  I guess I would still need to experiment with it but would prefer to use a package that has a wider range of led choices to be flexible.

 

Till now I have used simple 0805 LEDs for simple PCB indications. 

 

 

 

 

This topic has a solution.

Thanks

Regards

DJ

Last Edited: Sun. May 2, 2021 - 09:50 PM
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In Australia we can get enclosures with clear plastic lids. Would that help?

 

A few here https://www.jaycar.com.au/search...

John Samperi

Ampertronics Pty. Ltd.

https://www.ampertronics.com.au

* Electronic Design * Custom Products * Contract Assembly

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There are a number of IP65 or better enclosures with transparent lids. I can provide a partial list if that would help.

Jim

 

Until Black Lives Matter, we do not have "All Lives Matter"!

 

 

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search for acrylic boxes ...you can get some for only 50 cents and seal them up with some glue

 

also acrylic flower boxes, ring boxes.....

 

https://www.containerstore.com/s...

 

Use leaded leds that can stand up from the board & touch the wall of the enclosure, otherwise it will spread out like a blur on the entire box.

When in the dark remember-the future looks brighter than ever.   I look forward to being able to predict the future!

Last Edited: Sat. May 1, 2021 - 01:45 AM
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avrcandies wrote:
... & touch the wall of the enclosure,
Same with a light pipe some of which touch to a SMT LED.

"Dare to be naïve." - Buckminster Fuller

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I don't have much choice on the enclosure, for this project.

I have been asked can we place an led bright enough to shine the through the plastic enclosure. 

Thanks

Regards

DJ

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djoshi wrote:

I don't have much choice on the enclosure, for this project.

 

So what are your constraints? What choices do you have?

 

djoshi wrote:

I have been asked can we place an led bright enough to shine the through the plastic enclosure. 

 

As others have said, a clear lid will be fine. A coloured translucent lid will also work. A 'normal' black or grey ABS/polycarbonate box will not work.

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djoshi wrote:

Has anyone else used LEDs in such way?

Yes - but there a light guide was used to funnel the light out.

 

I have seen a few products where the entire interior was illuminated - but they were cheap & nasty things. A USB extension lead with clear rubber overmould for example.

 

Looking around at some typical products I see some have really small holes: My wireless earphones for example have < 1mm diameter hole for Bluetooth Status indication.

 

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N.Winterbottom wrote:

djoshi wrote:

 

Has anyone else used LEDs in such way?

Yes - but there a light guide was used to funnel the light out.

 

I have seen a few products where the entire interior was illuminated - but they were cheap & nasty things. A USB extension lead with clear rubber overmould for example.

 

Looking around at some typical products I see some have really small holes: My wireless earphones for example have < 1mm diameter hole for Bluetooth Status indication.

 

 

Yes that i was is required a simple way to illuminate some light. 

 

 

Thanks

Regards

DJ

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djoshi wrote:
Yes that i was is
translates as?...

Ross McKenzie ValuSoft Melbourne Australia

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I have noticed from an initial experiment if the enclosure wall thickness is thin

I don't have much choice on the enclosure, for this project.

Somehow these don't seem to go together, causing a stack overflow   Yes that i was is required a simple way to illuminate some light. 

When in the dark remember-the future looks brighter than ever.   I look forward to being able to predict the future!

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Sorry typing mistake, best not to use a phone to reply.

Thanks

Regards

DJ

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avrcandies wrote:

I have noticed from an initial experiment if the enclosure wall thickness is thin

I don't have much choice on the enclosure, for this project.

Somehow these don't seem to go together, causing a stack overflow   Yes that i was is required a simple way to illuminate some light. 

 

I will be sending some pictures of what i am trying to do.

Thanks

Regards

DJ

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This is a small paper bin, the circuit will placed in the inside wall. You can see an RED light. 


 

Thanks

Regards

DJ

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To assist people I would ;
1) draw a square on the outside so that people know where to look for the light,
and/or
2) pulse (flash) the LED to indicate operating status. (slow flash = ok, rapid flash = fault)

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Brian Fairchild wrote:
djoshi wrote:

I don't have much choice on the enclosure, for this project.

So what are your constraints? What choices do you have?

+1

 

These are essential questions - can't really help you without answers to those!

 

Are you looking for an off-the-shelf, standard enclosure; or do you have an existing custom enclosure?

(#14 looks rather like a custom enclosure?)

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mikech wrote:
To assist people I would ; 1) draw a square on the outside so that people know where to look for the light, and/or 2) pulse (flash) the LED to indicate operating status. (slow flash = ok, rapid flash = fault)

 

Yes, i will be adding some type of indication, to get people's attention.

 

But i would like to know is there any particular LED size or colour that i should use on my PCB to be more effective.

Thanks

Regards

DJ

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This is already an enclosure(paper shreader bin ) that is existing, therefore it can not be changed.  

 

Therefore the only thing that can be changed is the LED size or color, so that example shown can be replicated with a SMD version.

Thanks

Regards

DJ

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djoshi wrote:

But i would like to know is there any particular LED size or colour that i should use on my PCB to be more effective.

 

Yes. Something bright - high efficiency LEDs are a good start. The human eye is most sensitive to green light, but it depends on the background light around your box; some tests with different colours will help you decide the best option.

 

Any type with a focussed (narrow angle) beam will be subjectively brighter but not so bright off-axis; again, you'll need to experiment to see what works well. A wider - 5-10mm - light source will be more obvious, which points to the larger leaded types. And if it's wide, you can mount it as close as possible to the casing.

 

Neil

This reply has been marked as the solution. 
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This is already an enclosure(paper shreader bin ) that is existing, therefore it can not be changed.  

How did it take 18 messages to mention that???

 

Use a tight beam so that it will have high contrast with the  plastic--spread out will do no good.  There really won't be an off-axis effect, since you are illuminating and entire square, flat,  area.

 

Move the led closer to the top, maybe....at the floor probably will be overlooked or hidden.  Note you can stick on a "fresnel/prism type" lens/material on the front to direct the light upward instead of straight out.

 

https://www.luminitco.com/produc...

 

http://www.opticalfilters.co.uk/...

When in the dark remember-the future looks brighter than ever.   I look forward to being able to predict the future!

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Drill a hole slightly smaller than the diameter of a 5mm LED. Glue the LED into the hole and use a flying lead and polarised connector combination to attach to your pcb assembly.

Ross McKenzie ValuSoft Melbourne Australia

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djoshi wrote:
This is already an enclosure(paper shreader bin ) that is existing,   

Didn't you think that was essential information to know from the outset?

 

therefore it can not be changed.

What about drilling holes - as Ross suggested?

 

An alternative to fixing the LED in the hole would be to fill the hole with something transparent - and put the LED behind that.

 

Does it even matter if there's an unfilled hole in this casing?

 

 

Top Tips:

  1. How to properly post source code - see: https://www.avrfreaks.net/comment... - also how to properly include images/pictures
  2. "Garbage" characters on a serial terminal are (almost?) invariably due to wrong baud rate - see: https://learn.sparkfun.com/tutorials/serial-communication
  3. Wrong baud rate is usually due to not running at the speed you thought; check by blinking a LED to see if you get the speed you expected
  4. Difference between a crystal, and a crystal oscillatorhttps://www.avrfreaks.net/comment...
  5. When your question is resolved, mark the solution: https://www.avrfreaks.net/comment...
  6. Beginner's "Getting Started" tips: https://www.avrfreaks.net/comment...
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I'm confused. Back in post #14 there is a picture of an LED showing through your chosen (?) enclosure. Does this not achieve what you want?

#1 Hardware Problem? https://www.avrfreaks.net/forum/...

#2 Hardware Problem? Read AVR042.

#3 All grounds are not created equal

#4 Have you proved your chip is running at xxMHz?

#5 "If you think you need floating point to solve the problem then you don't understand the problem. If you really do need floating point then you have a problem you do not understand."

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I think djoshi was looking for ideas to improve what unfortunately looks a fairly shoddy implementation of an LED indicator.

 

@djoshi Just stating the obvious here - no offence meant.