RGB LED

This seems to be a multi-vendor common footprint for RGB LEDs, a PLCC6
package. It's nice in that the diode connections are independent, so
one can use any handy drive circuit. The blues generally need more
voltage.

https://www.dropbox.com/s/dem8abfzwryw78l/Cree_RGB.png?raw=1

https://www.dropbox.com/s/gqzruatzo6j7sg8/Cree_PLCC6_RGB.JPG?raw=1



--

John Larkin Highland Technology, Inc

lunatic fringe electronics

 

[John Miles, KE5FX]

On Wednesday, October 30, 2019 at 8:33:41 AM UTC-7, jla...@highlandsniptechnology.com wrote:

https://www.dropbox.com/s/dem8abfzwryw78l/Cree_RGB.png?raw=1

https://www.dropbox.com/s/gqzruatzo6j7sg8/Cree_PLCC6_RGB.JPG?raw=1

Cool, I'll have to check those out.

Big fan of RGB LEDs. It's amazing how much information they can get
across. I've been using these Rohm SMLP36RGB1W3 parts, which are a
little bigger than 0603 size:

https://www.digikey.com/short/pdnw0b

D'oh, make that SMLP36RGB2W3R:

https://www.digikey.com/short/pdnwnh

That's the problem with RGB LEDs, you have to keep updating your BOMs. Sometimes they go away completely. Everybody go buy a bunch of these
so they'll keep making them.

-- john, KE5FX

 

[John Larkin]

On Wed, 30 Oct 2019 10:16:58 -0700 (PDT), "John Miles, KE5FX"
<jmiles@gmail.com> wrote:

On Wednesday, October 30, 2019 at 8:33:41 AM UTC-7, jla...@highlandsniptechnology.com wrote:
https://www.dropbox.com/s/dem8abfzwryw78l/Cree_RGB.png?raw=1

https://www.dropbox.com/s/gqzruatzo6j7sg8/Cree_PLCC6_RGB.JPG?raw=1


Cool, I'll have to check those out.

Big fan of RGB LEDs. It's amazing how much information they can get
across. I've been using these Rohm SMLP36RGB1W3 parts, which are a
little bigger than 0603 size:

https://www.digikey.com/short/pdnw0b

D'oh, make that SMLP36RGB2W3R:

https://www.digikey.com/short/pdnwnh

That's the problem with RGB LEDs, you have to keep updating your BOMs. Sometimes they go away completely. Everybody go buy a bunch of these
so they'll keep making them.

-- john, KE5FX

I need a right-angle RGB to mount on a horizontal board but backlight
a small window in a front panel.

One great tragedy and frustration in my life, aside from the cat
snoring, is getting LED brightnesses right. People keep changing
things, especially the blue efficiency.

--

John Larkin Highland Technology, Inc
picosecond timing precision measurement

jlarkin att highlandtechnology dott com
http://www.highlandtechnology.com

 

[TTman]

On 30/10/2019 15:33, jlarkin@highlandsniptechnology.com wrote:

This seems to be a multi-vendor common footprint for RGB LEDs, a PLCC6
package. It's nice in that the diode connections are independent, so
one can use any handy drive circuit. The blues generally need more
voltage.

https://www.dropbox.com/s/dem8abfzwryw78l/Cree_RGB.png?raw=1

https://www.dropbox.com/s/gqzruatzo6j7sg8/Cree_PLCC6_RGB.JPG?raw=1

Have you tried the RGB LEDs that have 4 wires and data in, data out ,
driven by a microcontroller? They're fun... + software controlled
brightness...

--
This email has been checked for viruses by Avast antivirus software.
https://www.avast.com/antivirus

 

[John Larkin]

On Wed, 30 Oct 2019 22:39:44 +0000, TTman <kraken.sankey@gmail.com>
wrote:

On 30/10/2019 15:33, jlarkin@highlandsniptechnology.com wrote:
This seems to be a multi-vendor common footprint for RGB LEDs, a PLCC6
package. It's nice in that the diode connections are independent, so
one can use any handy drive circuit. The blues generally need more
voltage.

https://www.dropbox.com/s/dem8abfzwryw78l/Cree_RGB.png?raw=1

https://www.dropbox.com/s/gqzruatzo6j7sg8/Cree_PLCC6_RGB.JPG?raw=1



Have you tried the RGB LEDs that have 4 wires and data in, data out ,
driven by a microcontroller? They're fun... + software controlled
brightness...

Is that an SPI link?

--

John Larkin Highland Technology, Inc
picosecond timing precision measurement

jlarkin att highlandtechnology dott com
http://www.highlandtechnology.com

 

[Lasse Langwadt Christense]

onsdag den 30. oktober 2019 kl. 23.47.47 UTC+1 skrev John Larkin:

On Wed, 30 Oct 2019 22:39:44 +0000, TTman <kraken.sankey@gmail.com
wrote:

On 30/10/2019 15:33, jlarkin@highlandsniptechnology.com wrote:
This seems to be a multi-vendor common footprint for RGB LEDs, a PLCC6
package. It's nice in that the diode connections are independent, so
one can use any handy drive circuit. The blues generally need more
voltage.

https://www.dropbox.com/s/dem8abfzwryw78l/Cree_RGB.png?raw=1

https://www.dropbox.com/s/gqzruatzo6j7sg8/Cree_PLCC6_RGB.JPG?raw=1



Have you tried the RGB LEDs that have 4 wires and data in, data out ,
driven by a microcontroller? They're fun... + software controlled
brightness...

Is that an SPI link?

not quite, it is burst of ~800kHz with a different duty cycle for 0 and 1

an example: https://cdn-shop.adafruit.com/product-files/1138/SK6812+LED+datasheet+.pdf

 

[Rick C]

On Wednesday, October 30, 2019 at 7:01:52 PM UTC-4, Lasse Langwadt Christensen wrote:

onsdag den 30. oktober 2019 kl. 23.47.47 UTC+1 skrev John Larkin:
On Wed, 30 Oct 2019 22:39:44 +0000, TTman <kraken.sankey@gmail.com
wrote:

On 30/10/2019 15:33, jlarkin@highlandsniptechnology.com wrote:
This seems to be a multi-vendor common footprint for RGB LEDs, a PLCC6
package. It's nice in that the diode connections are independent, so
one can use any handy drive circuit. The blues generally need more
voltage.

https://www.dropbox.com/s/dem8abfzwryw78l/Cree_RGB.png?raw=1

https://www.dropbox.com/s/gqzruatzo6j7sg8/Cree_PLCC6_RGB.JPG?raw=1



Have you tried the RGB LEDs that have 4 wires and data in, data out ,
driven by a microcontroller? They're fun... + software controlled
brightness...

Is that an SPI link?


not quite, it is burst of ~800kHz with a different duty cycle for 0 and 1

an example: https://cdn-shop.adafruit.com/product-files/1138/SK6812+LED+datasheet+.pdf

More like 1 wire, but the protocol is for chained devices rather than addressed. Kinda like configuring a chain of Xilinx FPGAs.

--

Rick C.

- Get 1,000 miles of free Supercharging
- Tesla referral code - https://ts.la/richard11209

 

On Wed, 30 Oct 2019 16:01:46 -0700 (PDT), Lasse Langwadt Christensen
<langwadt@fonz.dk> wrote:

onsdag den 30. oktober 2019 kl. 23.47.47 UTC+1 skrev John Larkin:
On Wed, 30 Oct 2019 22:39:44 +0000, TTman <kraken.sankey@gmail.com
wrote:

On 30/10/2019 15:33, jlarkin@highlandsniptechnology.com wrote:
This seems to be a multi-vendor common footprint for RGB LEDs, a PLCC6
package. It's nice in that the diode connections are independent, so
one can use any handy drive circuit. The blues generally need more
voltage.

https://www.dropbox.com/s/dem8abfzwryw78l/Cree_RGB.png?raw=1

https://www.dropbox.com/s/gqzruatzo6j7sg8/Cree_PLCC6_RGB.JPG?raw=1



Have you tried the RGB LEDs that have 4 wires and data in, data out ,
driven by a microcontroller? They're fun... + software controlled
brightness...

Is that an SPI link?


not quite, it is burst of ~800kHz with a different duty cycle for 0 and 1

an example: https://cdn-shop.adafruit.com/product-files/1138/SK6812+LED+datasheet+.pdf

That is some amazing writing.



--

John Larkin Highland Technology, Inc

lunatic fringe electronics

 

[Lasse Langwadt Christense]

torsdag den 31. oktober 2019 kl. 05.55.49 UTC+1 skrev jla...@highlandsniptechnology.com:

On Wed, 30 Oct 2019 16:01:46 -0700 (PDT), Lasse Langwadt Christensen
langwadt@fonz.dk> wrote:

onsdag den 30. oktober 2019 kl. 23.47.47 UTC+1 skrev John Larkin:
On Wed, 30 Oct 2019 22:39:44 +0000, TTman <kraken.sankey@gmail.com
wrote:

On 30/10/2019 15:33, jlarkin@highlandsniptechnology.com wrote:
This seems to be a multi-vendor common footprint for RGB LEDs, a PLCC6
package. It's nice in that the diode connections are independent, so
one can use any handy drive circuit. The blues generally need more
voltage.

https://www.dropbox.com/s/dem8abfzwryw78l/Cree_RGB.png?raw=1

https://www.dropbox.com/s/gqzruatzo6j7sg8/Cree_PLCC6_RGB.JPG?raw=1



Have you tried the RGB LEDs that have 4 wires and data in, data out ,
driven by a microcontroller? They're fun... + software controlled
brightness...

Is that an SPI link?


not quite, it is burst of ~800kHz with a different duty cycle for 0 and 1

an example: https://cdn-shop.adafruit.com/product-files/1138/SK6812+LED+datasheet+.pdf

That is some amazing writing.

you'd prefer it in Chinese?

 

[Jan Panteltje]

On a sunny day (Thu, 31 Oct 2019 02:11:16 -0700 (PDT)) it happened Lasse
Langwadt Christensen <langwadt@fonz.dk> wrote in
<19c3d163-87b5-496e-a4a6-5b5124c208ab@googlegroups.com>:

not quite, it is burst of ~800kHz with a different duty cycle for 0 and 1

an example: https://cdn-shop.adafruit.com/product-files/1138/SK6812+LED+datasheet+.pdf

That is some amazing writing.


you'd prefer it in Chinese?

mm, ;-)
One thing I noticed when driving RGB LED strips is that when you run the Red
Green and Blue LEDs from a different PWM clock, then you can very strange optical
effects.
I had to fix it for my ethernet LED controller,
it has 3 PICs, one for each color, and had to connect the PIC clocks all to the same source.
It seems for this thing the LED PWM is generated in the LED module,
so maybe test a few together before buying a thousand...
http://panteltje.com/panteltje/pic/ethernet_color_pic/
Changes in version 0.6
Thing is on all the time... Can even do disco lights,,

Chinese .. China will soon take over the west of the US and Russia the east.
I think the main language will be Chinese in LA and Frisco ...
Block diagram is from left to right, same with my Chinese DVB-T2 tuner, remote
select works from left to right..

 

[Jan Panteltje]

On a sunny day (Thu, 31 Oct 2019 11:22:08 GMT) it happened Jan Panteltje
<pNaOnStPeAlMtje@yahoo.com> wrote in <qpeg7n$k23$1@dont-email.me>:

On a sunny day (Thu, 31 Oct 2019 02:11:16 -0700 (PDT)) it happened Lasse
Langwadt Christensen <langwadt@fonz.dk> wrote in
19c3d163-87b5-496e-a4a6-5b5124c208ab@googlegroups.com>:


not quite, it is burst of ~800kHz with a different duty cycle for 0 and 1

an example: https://cdn-shop.adafruit.com/product-files/1138/SK6812+LED+datasheet+.pdf

That is some amazing writing.


you'd prefer it in Chinese?

mm, ;-)
One thing I noticed when driving RGB LED strips is that when you run the Red
Green and Blue LEDs from a different PWM clock, then you can very strange optical
effects.
I had to fix it for my ethernet LED controller,
it has 3 PICs, one for each color, and had to connect the PIC clocks all to the same source.
It seems for this thing the LED PWM is generated in the LED module,
so maybe test a few together before buying a thousand...
http://panteltje.com/panteltje/pic/ethernet_color_pic/
Changes in version 0.6
Thing is on all the time... Can even do disco lights,,

Chinese .. China will soon take over the west of the US and Russia the east.
I think the main language will be Chinese in LA and Frisco ...
Block diagram is from left to right, same with my Chinese DVB-T2 tuner, remote
select works from left to right..

Sorry ment right to left 2x
Getting Chinese already..

 

[Winfield Hill]

John Larkin wrote...

One great tragedy and frustration in my life, aside
from the cat snoring, is getting LED brightnesses
right. People keep changing things, especially the
blue efficiency.

Drive your RGB with a programmable current sink, like
the PCA9533. Add a light sensor, and automatically
calibrate your three LED intensities at turn-on. Then
you can concentrate all your attention to cat snoring.


--
Thanks,
- Win

 

On Wednesday, 30 October 2019 18:01:19 UTC, John Larkin wrote:

One great tragedy and frustration in my life, aside from the cat
snoring, is getting LED brightnesses right. People keep changing
things, especially the blue efficiency.

once you make it adjustable you can forget about it


NT

 

On 31 Oct 2019 05:57:05 -0700, Winfield Hill <winfieldhill@yahoo.com>
wrote:

John Larkin wrote...

One great tragedy and frustration in my life, aside
from the cat snoring, is getting LED brightnesses
right. People keep changing things, especially the
blue efficiency.

Drive your RGB with a programmable current sink, like
the PCA9533. Add a light sensor, and automatically
calibrate your three LED intensities at turn-on. Then
you can concentrate all your attention to cat snoring.

We usually have a string of TPIC6595s as a giant shift register driven
off a uP SPI port. It drives relays, LEDs, SSRs, whatever. LED
brightness is set by resistors. We can sometimes have a lot of LEDs on
an instrument.

I guess we could use a quad DAC (or a PWM DAC, or just a PWMd supply)
to supply the LED anode voltages, one supply for each color, but even
that sounds like a big deal.

We could PWM the gate input of the TPIC, but each TPIC could only
drive LEDs of one color. That's not too bad I guess.

But what am I to do about the cat?



--

John Larkin Highland Technology, Inc

lunatic fringe electronics

 

On Thu, 31 Oct 2019 11:22:08 GMT, Jan Panteltje
<pNaOnStPeAlMtje@yahoo.com> wrote:

On a sunny day (Thu, 31 Oct 2019 02:11:16 -0700 (PDT)) it happened Lasse
Langwadt Christensen <langwadt@fonz.dk> wrote in
19c3d163-87b5-496e-a4a6-5b5124c208ab@googlegroups.com>:


not quite, it is burst of ~800kHz with a different duty cycle for 0 and 1

an example: https://cdn-shop.adafruit.com/product-files/1138/SK6812+LED+datasheet+.pdf

That is some amazing writing.


you'd prefer it in Chinese?

mm, ;-)
One thing I noticed when driving RGB LED strips is that when you run the Red
Green and Blue LEDs from a different PWM clock, then you can very strange optical
effects.
I had to fix it for my ethernet LED controller,
it has 3 PICs, one for each color, and had to connect the PIC clocks all to the same source.
It seems for this thing the LED PWM is generated in the LED module,
so maybe test a few together before buying a thousand...
http://panteltje.com/panteltje/pic/ethernet_color_pic/
Changes in version 0.6
Thing is on all the time... Can even do disco lights,,

I can sort of almost resolve parts of that.

Chinese .. China will soon take over the west of the US and Russia the east.
I think the main language will be Chinese in LA and Frisco ...
Block diagram is from left to right, same with my Chinese DVB-T2 tuner, remote
select works from left to right..

The 2nd language here is Spanish. There are multiple versions of
spoken "Chinese." My various Spanish-speaking employees, from all over
the world, say they can communicate fine. One of my engineers is from
northern Mexico, one from Peru, and they chatter away in Spanish. I
never hear the Asians speaking anything but English.

What's funny is that all sorts of packaged foods and veggies here have
the labels in two languages, English and French.




--

John Larkin Highland Technology, Inc

lunatic fringe electronics

 

[Jan Panteltje]

On a sunny day (Thu, 31 Oct 2019 07:43:14 -0700) it happened
jlarkin@highlandsniptechnology.com wrote in
<f7slret7697mkhpf58hpnvv2qbq15tt8f8@4ax.com>:

On Thu, 31 Oct 2019 11:22:08 GMT, Jan Panteltje
pNaOnStPeAlMtje@yahoo.com> wrote:

On a sunny day (Thu, 31 Oct 2019 02:11:16 -0700 (PDT)) it happened Lasse
Langwadt Christensen <langwadt@fonz.dk> wrote in
19c3d163-87b5-496e-a4a6-5b5124c208ab@googlegroups.com>:


not quite, it is burst of ~800kHz with a different duty cycle for 0 and 1

an example: https://cdn-shop.adafruit.com/product-files/1138/SK6812+LED+datasheet+.pdf

That is some amazing writing.


you'd prefer it in Chinese?

mm, ;-)
One thing I noticed when driving RGB LED strips is that when you run the Red
Green and Blue LEDs from a different PWM clock, then you can very strange optical
effects.
I had to fix it for my ethernet LED controller,
it has 3 PICs, one for each color, and had to connect the PIC clocks all to the same source.
It seems for this thing the LED PWM is generated in the LED module,
so maybe test a few together before buying a thousand...
http://panteltje.com/panteltje/pic/ethernet_color_pic/
Changes in version 0.6
Thing is on all the time... Can even do disco lights,,

I can sort of almost resolve parts of that.

Yea, well I hope it stays working so I do not have to decipher my own scribblings.

Chinese .. China will soon take over the west of the US and Russia the east.
I think the main language will be Chinese in LA and Frisco ...
Block diagram is from left to right, same with my Chinese DVB-T2 tuner, remote
select works from left to right..

The 2nd language here is Spanish. There are multiple versions of
spoken "Chinese." My various Spanish-speaking employees, from all over
the world, say they can communicate fine. One of my engineers is from
northern Mexico, one from Peru, and they chatter away in Spanish. I
never hear the Asians speaking anything but English.

Spanish, Portuguese is not that far of from our languages, also writing,
but Chinese Mandarin is for me still a no go.
I started on Chinese, but really I would have to live there some years
I think and get language lessons there,,,

Today the first F35 we bought from the US landed here,
whole top brass was there, it is just miles away, flew over here,
http://panteltje.com/pub/first_F35_lands_at_Leeuwarden_airport_IXIMG_0212.JPG
http://panteltje.com/pub/first_F35_pilot_IXIMG_0225.JPG
did not go but was live on local TV:
http://panteltje.com/pub/first_F35_from_TV_IMXIMG_0211.JPG

Think it caught fire ;-) fire guys sprayed it, maybe that was welcome?
http://panteltje.com/pub/first_F35_was_on_fire_it_seems_IXIMG_0228.JPG

Anyways, so much for 'stealth', I was reading we get 34 of these here,
oh what fun, better get a helmet,
But great to test my tracking system, passive radar should work, IR should work
sound with pattern recognition should work..
I think it is the dumbest plane I have ever seen.

So, and I was also reading US army has adopted Microsoft...
Now the world had won, I do remember a blue screen and a war ship needing
towing back to base...

Not that Linux is perfect, been fighting with the latest changes all day...
Some people like fixing things in Unix and than making a monster like Ms-Windows.
But.. I have my news-reader working on a Raspberry Pi 4 now.
There are a hundred or so more applications I wrote that have to be recompiled from source,
OK

What's funny is that all sorts of packaged foods and veggies here have
the labels in two languages, English and French.

Yes, when UK leaves EU (IF??) then English will no longer be used here,
German and French I think. Spanish a bit too.

 

[Steve Wilson]

jlarkin@highlandsniptechnology.com wrote:

We usually have a string of TPIC6595s as a giant shift register driven
off a uP SPI port. It drives relays, LEDs, SSRs, whatever. LED
brightness is set by resistors. We can sometimes have a lot of LEDs on
an instrument.

I guess we could use a quad DAC (or a PWM DAC, or just a PWMd supply)
to supply the LED anode voltages, one supply for each color, but even
that sounds like a big deal.

We could PWM the gate input of the TPIC, but each TPIC could only
drive LEDs of one color. That's not too bad I guess.

But what am I to do about the cat?

Catnip

 

On Thursday, 31 October 2019 14:33:17 UTC, jla...@highlandsniptechnology.com

> But what am I to do about the cat?

love seems to work

 

[Sjouke Burry]

On 31.10.19 19:36, tabbypurr@gmail.com wrote:

On Thursday, 31 October 2019 14:33:17 UTC, jla...@highlandsniptechnology.com

But what am I to do about the cat?

love seems to work

Else a belly scratch.

 

[John Larkin]

On Thu, 31 Oct 2019 19:51:06 +0100, Sjouke Burry
<burrynulnulfour@ppllaanneett.nnll> wrote:

On 31.10.19 19:36, tabbypurr@gmail.com wrote:
On Thursday, 31 October 2019 14:33:17 UTC, jla...@highlandsniptechnology.com

But what am I to do about the cat?

love seems to work

Else a belly scratch.

Belly scratch will stop the snoring, for a while. Tail pulling seems
to work too.

--

John Larkin Highland Technology, Inc
picosecond timing precision measurement

jlarkin att highlandtechnology dott com
http://www.highlandtechnology.com