On Sun, 20 Apr 2008 09:17:36 -0400, CBFalconer wrote:
> Tomás Ó hÉilidhe wrote:
>>
>> My project board looks great in a dimly lit room, the LED's are nice
>> and bright. In a well lit-up room though, it looks crap.
>>
>> I'll be putting my board in a transparent perspex case. I wonder is
>> there any kind of layer or coating I can put on the perspex so that the
>> LED's will look bright in daylight?
>
> Find a suitable rheostat and put it in series with the power leads to
> the sun. Adjust as needed. :-)
You _know_ that isn't practical. Think about it -- there's an 8-minute
lag for the new light level to get from the sun to you, and with a 66%
velocity factor in the leads from the rheostat there's a 12-minute lag
going the other way -- that's a 20 minute total lag, which is just way
too long.
--
Tim Wescott
Control systems and communications consulting
http://www.wescottdesign.com
Need to learn how to apply control theory in your embedded system?
"Applied Control Theory for Embedded Systems" by Tim Wescott
Elsevier/Newnes, http://www.wescottdesign.com/actfes/actfes.html
Reply by linnix●April 20, 20082008-04-20
On Apr 20, 4:21 am, Arlet Ottens <usene...@c-scape.nl> wrote:
> Tom=E1s =D3 h=C9ilidhe wrote:
>
> > My project board looks great in a dimly lit room, the LED's are nice
> > and bright. In a well lit-up room though, it looks crap.
>
> > I'll be putting my board in a transparent perspex case. I wonder is
> > there any kind of layer or coating I can put on the perspex so that
> > the LED's will look bright in daylight?
>
> Use brighter LEDs.
Or use LCD. Reflective LCD are better for daylight and/or outdoor
viewings.
>
> My project board looks great in a dimly lit room, the LED's are
> nice and bright. In a well lit-up room though, it looks crap.
>
> I'll be putting my board in a transparent perspex case. I wonder
> is there any kind of layer or coating I can put on the perspex
> so that the LED's will look bright in daylight?
Find a suitable rheostat and put it in series with the power leads
to the sun. Adjust as needed. :-)
--
[mail]: Chuck F (cbfalconer at maineline dot net)
[page]: <http://cbfalconer.home.att.net>
Try the download section.
** Posted from http://www.teranews.com **
Reply by Spehro Pefhany●April 20, 20082008-04-20
On Sun, 20 Apr 2008 04:11:15 -0700 (PDT), the renowned Tom�s �
h�ilidhe <toe@lavabit.com> wrote:
>
>
>My project board looks great in a dimly lit room, the LED's are nice
>and bright. In a well lit-up room though, it looks crap.
>
>I'll be putting my board in a transparent perspex case. I wonder is
>there any kind of layer or coating I can put on the perspex so that
>the LED's will look bright in daylight?
Tinting it the same color as the LEDs can help a lot.
Best regards,
Spehro Pefhany
--
"it's the network..." "The Journey is the reward"
speff@interlog.com Info for manufacturers: http://www.trexon.com
Embedded software/hardware/analog Info for designers: http://www.speff.com
Reply by larwe●April 20, 20082008-04-20
On Apr 20, 7:11=A0am, Tom=E1s =D3 h=C9ilidhe <t...@lavabit.com> wrote:
> I'll be putting my board in a transparent perspex case. I wonder is
> there any kind of layer or coating I can put on the perspex so that
> the LED's will look bright in daylight?
Besides using brighter LEDs and/or increasing the duty cycle (if
muxed), the way one normally improves contrast is by using a dark
perspex. Look at the front of an older LED sign that uses discrete
LEDs and you'll see what I mean.
>
> My project board looks great in a dimly lit room, the LED's are nice
> and bright. In a well lit-up room though, it looks crap.
>
> I'll be putting my board in a transparent perspex case. I wonder is
> there any kind of layer or coating I can put on the perspex so that
> the LED's will look bright in daylight?
Use brighter LEDs.
Reply by ●April 20, 20082008-04-20
My project board looks great in a dimly lit room, the LED's are nice
and bright. In a well lit-up room though, it looks crap.
I'll be putting my board in a transparent perspex case. I wonder is
there any kind of layer or coating I can put on the perspex so that
the LED's will look bright in daylight?