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Sean Breheny | 1 Dec 05:25
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[EE] Help identifying LED module

Hi all,

I have two 7-digit multiplexed LED display modules that I'd like to
use for a project but I do not know the pinout. I tried some Google
searches but couldn't find any data. The part is marked
"LS-2072YKB-93R05" Can anyone point me in the right direction?

Thanks,

Sean
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William "Chops" Westfield | 1 Dec 05:44
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Re: [EE] TI releases watch development kit (wireless, accel, pressure, temp, etc)

>> http://www.ecnmag.com/Products/2009/11/Sports-Watch-Development-Kit-Fits-on-your-Wrist/

There was a discount if you attended TI's "MCU Day" a couple months  
back;  I've had mine ordered for quite a while.  Hopefully this widely- 
viewed announcement means that it will show up soon.

The other interesting device is http://www.hawkboard.org/, a board  
similar to beagleboard  based on the OMAP L138 application processor  
(300MHz ARM9 + DSP.  Runs linux.)  This is similar to Beagleboard, but  
less video oriented (and has ethernet built in!)

BillW

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Marcel Duchamp | 1 Dec 05:55
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Re: [EE] Help identifying LED module

Use your DMM in "diode" mode or "ohms" mode, etc, to get segments to 
light.  If you don't have one, use a 5 volt power supply and a 5.1K 
resistor.  You should quickly be able to find the common pin, be it 
common anode or common cathode.  Then the rest is simply probing around 
til you have the segments all doped out.

Sean Breheny wrote:
> Hi all,
> 
> I have two 7-digit multiplexed LED display modules that I'd like to
> use for a project but I do not know the pinout. I tried some Google
> searches but couldn't find any data. The part is marked
> "LS-2072YKB-93R05" Can anyone point me in the right direction?
> 
> Thanks,
> 
> Sean

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Dr Skip | 1 Dec 06:11
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Re: [EE] Making a Smoke Alarm distinctive 99tweet

I doubt that... It's an alarm for the occupants, not a cause of the fire 
(unless the mod does CAUSE the fire). If that were the case, then a dead 
battery in a smoke alarm would trigger the same invalidation. IF it were a 
rental or such, then there may be liability for injury if they didn't go off 
and warn the renters to get out. A non-functioning alarm neither causes a fire 
nor prevents it.

Again, if this generality were true, then a broken one (if later analysis even 
tries to ascertain that) would be a similar case, as would be taking it out and 
having a fire while buying a replacement. There would also have to be proof 
that the modified alarm didn't work as well. All these are irrelevant to the 
existence of the fire in the first place, unless the thing caused it. Without 
someone saying "we never heard the smoke alarm" and then were injured by the 
delay in getting out, it would never even come up I suspect.

Marc Nicholas wrote:
> Of course, any tinkering you do likely automatically invalidates your
> building insurance policy upon a fire-related claim :)
> 
> -marc
> 
> On 11/29/09, YES NOPE9 <yes <at> nope9.com> wrote:
> 
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Dwayne Reid | 1 Dec 06:50
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Re: [EE] Help identifying LED module

Gosh, Sean.

I don't mean to be rude but I'd think that 5 minutes with a power 
supply or 9V battery and a 1k resistor would give you that information.

Its really easy!  Just clip one side of the battery to a corner 
pin.  Brush the resistor lead (other side of the resistor goes to the 
other side of the battery) along all of the other pins.

If nothing lights up (probably won't), move the battery clip to the 
next pin along and repeat the brushing procedure.

Fairly quickly, a LED segment will light.  Keep track of what lights 
up with which pin.

You will find that it takes not much more than 5 minutes to identify 
all of the anodes and cathodes.  You can then figure out if the 
display is common anode or common cathode.

dwayne

At 09:25 PM 11/30/2009, Sean Breheny wrote:
>Hi all,
>
>I have two 7-digit multiplexed LED display modules that I'd like to
>use for a project but I do not know the pinout. I tried some Google
>searches but couldn't find any data. The part is marked
>"LS-2072YKB-93R05" Can anyone point me in the right direction?
>
>Thanks,
(Continue reading)

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YES NOPE9 | 1 Dec 07:15
Gravatar

[EE] HawkBoard is ARM based ... Are there any FLOSS SBCs based on the EP80579 or equivalent ?

ARM based Hawkboard
http://elinux.org/Hawkboard
http://code.google.com/p/hawkboard/

Intel X86  EP80579   system on a chip  integrated processor  single chip
http://www.intel.com/design/intarch/ep80579/index.htm

Gus

> Begin forwarded message:
>
> From: "William \"Chops\" Westfield" <westfw <at> mac.com>
> Date: November 30, 2009 9:44:57 PM MST
> Subject: Re: [EE] TI releases watch development kit (wireless,  
> accel, pressure, temp, etc)
>
>>> http://www.ecnmag.com/Products/2009/11/Sports-Watch-Development-Kit-Fits-on-your-Wrist/
>
> There was a discount if you attended TI's "MCU Day" a couple months
> back;  I've had mine ordered for quite a while.  Hopefully this  
> widely-
> viewed announcement means that it will show up soon.
>
> The other interesting device is http://www.hawkboard.org/, a board
> similar to beagleboard  based on the OMAP L138 application processor
> (300MHz ARM9 + DSP.  Runs linux.)  This is similar to Beagleboard, but
> less video oriented (and has ethernet built in!)
>
> BillW
>
(Continue reading)

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Sean Breheny | 1 Dec 07:34
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Re: [EE] Help identifying LED module

Hi Dwayne and Marcel,

Yes, you are right. I will probably do just that. However, I always
like to see a datasheet for any "gotchas" before I use a part I'm
unfamiliar with and I was hoping that someone here just might be
familiar with this one.

Sean

On Tue, Dec 1, 2009 at 12:50 AM, Dwayne Reid <dwayner <at> planet.eon.net> wrote:
> Gosh, Sean.
>
> I don't mean to be rude but I'd think that 5 minutes with a power
> supply or 9V battery and a 1k resistor would give you that information.
>
> Its really easy!  Just clip one side of the battery to a corner
> pin.  Brush the resistor lead (other side of the resistor goes to the
> other side of the battery) along all of the other pins.
>
> If nothing lights up (probably won't), move the battery clip to the
> next pin along and repeat the brushing procedure.
>
> Fairly quickly, a LED segment will light.  Keep track of what lights
> up with which pin.
>
> You will find that it takes not much more than 5 minutes to identify
> all of the anodes and cathodes.  You can then figure out if the
> display is common anode or common cathode.
>
> dwayne
(Continue reading)

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Xiaofan Chen | 1 Dec 09:02
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Re: [EE] HawkBoard is ARM based ... Are there any FLOSS SBCs based on the EP80579 or equivalent ?

On Tue, Dec 1, 2009 at 2:15 PM, YES NOPE9 <yes <at> nope9.com> wrote:
> ARM based Hawkboard
> http://elinux.org/Hawkboard
> http://code.google.com/p/hawkboard/
>
> Intel X86  EP80579   system on a chip  integrated processor  single chip
> http://www.intel.com/design/intarch/ep80579/index.htm
>

I believe the Pentium M based SOCs are still too power hungry
for many applications. And ARMs are still much more popular
in the embedded market.

For the listed target market of the Intel SOC (especially those
communication related applications), MIPS is also very strong.

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M. Adam Davis | 1 Dec 19:51
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Re: [EE] Help identifying LED module

Shorter google searches showed that it's an obsolete ROHM part:

http://www.google.com/search?q=2072YKB+led

http://www.oemstrade.com/search/LS-2/

Their part number explanation sheet doesn't include the LS series, but
other parts of the part number may still be usable, which could mean
that it may be a yellow LED with a common cathode connection.

http://www.rohm.com/products/databook/dp/pdf/hinmei.pdf

Given that they don't appear to have data online, you'll have to call
or email ROHM directly for more information.

You will likely find that the pinout probably matches one of their
current models, so that should narrow your search down for determining
your own pinout.  Look for one with a similar form factor and pin
arrangement:

http://www.rohm.com/products/opto_device/led_display/numeric/

The LED characteristics are likely similar to one of the existing
yellow models (if, indeed, yours is yellow).

Chances are good, though, that if you contact them they'll fax or
email you a data sheet for it.

On Mon, Nov 30, 2009 at 11:25 PM, Sean Breheny <shb7 <at> cornell.edu> wrote:
> Hi all,
(Continue reading)

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M. Adam Davis | 1 Dec 20:11
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Re: [EE] LCD display loses stability , comes back

Either the macbook is driving it outside its range (but just barely)
or the monitor itself isn't sensing the clock and auto-synchronizing
appropriately.

You can try a few different refresh rates to see if you can find one
the monitor is happier with on wake up.  You might see this if, for
instance, the monitor is expecting 60Hz and the macbook is feeding
59.94Hz or vice versa - the monitor thinks it's in the right range,
but it's not, and it takes awhile to shift out of phase enough before
it does an autoadjust.

The monitor may also have a method to force and auto adjust, where it
will blank the screen and look at the signal carefully for a few
seconds before synchronizing to the signal again.  You may be able to
find the monitor manual online, and it may only be one button press
and hold.

Also, make sure you're driving it at its exact resolution - I've found
some LCD monitors adjust faster if you drive them at their native
resolution, although in theory it shouldn't make a difference.

On Thu, Nov 26, 2009 at 2:22 PM, YES NOPE9 <yes <at> nope9.com> wrote:
> I have an 19 inch LCD display I got for $5 at a junkyard.  I hacked
> together a 24V 2A supply for it.   It works fine except.......
> It is a second monitor for my MacBook.  When my MacBook goes to sleep,
> the display goes black.  When I wake my MacBook up, often the extra
> display is torn horizontally.  The right and left edges have jagged
> edges with a periodicity of about 4 mm.   At first I would turn the
> display on and off and eventually it would stabilize.   Then I
> accidently noticed that if I left it alone for 90 seconds .... the
(Continue reading)

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Gmane