Multi-colour LED Development

Evostance · Jan 26, 2011

OK guys, I emailed HTC about the LED and apparently it is a tri-colour LED

Dear XXX,

Thank you for contacting HTC.

Yes,it is a tri-color LED.

We don't support any software that directly controls it.

To send a reply to this message or let me know I have successfully answered your question log in to our ContactUs site using your email address and your ticket number XXXX.

Sincerely,

Bo

HTC

The aim of this being to get our LED to actual output any colour on the spectrum. The LED is capable of it, its just figuring out how to do it. The Desire Classic has the same LED yet they have Blue as one of their colours so we know its possible

Perhaps someone can try this within an app. See what we can get

To define your own color and pattern, define a value for the ledARGB field (for the color), the ledOffMS field (length of time, in milliseconds, to keep the light off), the ledOnMS (length of time, in milliseconds, to keep the light on), and also add "FLAG_SHOW_LIGHTS" to the flags field:

notification.ledARGB = 0xff00ff00;
notification.ledOnMS = 300;
notification.ledOffMS = 1000;
notification.flags |= Notification.FLAG_SHOW_LIGHTS;

Evostance · Jan 26, 2011

elmicha said:
Really? Maybe I did not pay enough attention, but I think I didn't see red on the DHD.

The directory /sys/class/leds has these sub-directories/symlinks:

amber
button-backlight
flashlight
green
keyboard-backlight
lcd-backlight

You can write a number to the brightness files therein, like

echo 1 >/sys/class/leds/amber/brightness
echo 1 >/sys/class/leds/green/brightness

Amber and green together is a bit more yellowish than amber alone.

Perhaps a place to start?

rorydaredkign · Jan 26, 2011

Evostance said:
Perhaps a place to start?

What is the aim? To get different colours for different events? e.g flash green on new email, amber on new call etc, or something else?

vinnieminnie · Jan 26, 2011

A while ago, someone mentioned a second led, next to the proximity/light-sensor. He also made a pic of it, it was definately there. Maybe you could try to incorporate that led in this project as well.

Evostance · Jan 26, 2011

rorydaredkign said:
What is the aim? To get different colours for different events? e.g flash green on new email, amber on new call etc, or something else?

Updated the first post

JamesBarnes · Jan 26, 2011

A tri colour LED does not mean it is capable of full spectrum colour.

It means the LED unit has 3 Diodes, each a different colour (probably tied to a common ground). To be able to reproduce all (most) colours the 3 LEDs need to be Red, Green and Blue.

In this instance however, it seems like the 3 colours are Red, Orange and Green.

The hardware controller likely is not capable of adjusting the brightness to each individual diode.

Evostance · Jan 26, 2011

The LED is the same as the one in the Desire Classic which can produce Blue

I did ask HTC for clarification and where to find the files to edit this. They just replied with "HTC does not offer development support" lol

JamesBarnes · Jan 26, 2011

Definitely?

That is good news if its true

DN41 · Jan 26, 2011

vinnieminnie said:
A while ago, someone mentioned a second led, next to the proximity/light-sensor. He also made a pic of it, it was definately there. Maybe you could try to incorporate that led in this project as well.

thats wrong..it was the proximity sensor itself. digital cameras are able to make infrared rays visible (normally white).
take your dhd, go into camera, place your tv remote in front of it and press some buttons. you should see a white "dot" on your dhd screen.

+1 for the developement

DN41

Evostance · Jan 26, 2011

JamesBarnes said:
Definitely?

That is good news if its true

From what I could gather yup.

I've emailed asking for clarification

JamesBarnes · Jan 26, 2011

Excellent, I hope that turns out to be the case.

vinnieminnie · Jan 26, 2011

DN41 said:
thats wrong..it was the proximity sensor itself. digital cameras are able to make infrared rays visible (normally white).
take your dhd, go into camera, place your tv remote in front of it and press some buttons. you should see a white "dot" on your dhd screen.

+1 for the developement

DN41

Even though this would be a clever explanation, that isn't the case. I found the video I was reffering to, here it is.

Evostance · Jan 26, 2011

OK

HTC are being idiots. They won't tell me if a the Tri-Color LED consists of RGB or not, even though I said im trying to develop a LED notifier.

Can someone else please try and ask them. Don't think they liked me ever since I asked about the system files lol

DN41 · Jan 26, 2011

yeah there was a discussion some days ago..
it's definitely the proximity sensor!

DN41

perern · Jan 26, 2011

DN41 said:
thats wrong..it was the proximity sensor itself. digital cameras are able to make infrared rays visible (normally white).
take your dhd, go into camera, place your tv remote in front of it and press some buttons. you should see a white "dot" on your dhd screen.

+1 for the developement

DN41

that's what i usually do to check controllers, and everyone wonders if i'm crazy

bergfex · Jan 26, 2011

one idea can be to disable the LED support for PM8053 and see if the notification LED is still working.

If this shows that the notification LED is driven by the PM8053, you can put some printk into the leds-pm8058.c file to see if the RGB mode is used.

...

kamranh3 · Jan 26, 2011

Evostance what's the email to contact HTC?

ynischa · Jan 27, 2011

vinnieminnie said:
Even though this would be a clever explanation, that isn't the case. I found the video I was reffering to, here it is.

That is probably either the proximity sensor or the light sensor (the one that adjusts auto brightness).

Edit: After some extensive testing using the finger-over-sensor-test, I have concluded that the light from the video is coming from the proximity sensor and that the other sensor (the rightmost one) is the brightness sensor.
I really don't believe that it is another LED.

Evostance · Jan 27, 2011

kamranh3 said:
Evostance what's the email to contact HTC?

They use a ticket system on their site. Google htc support

Sent from my Desire HD using Tapatalk

Rodomar705 · Jan 27, 2011

Here we are:

Ciao xxxx, Grazie per aver contattato il nostro supporto tecnico. Il nostro obiettivo e' offrirle un servizio di alta qualità e rispondere a tutte le sue domande. Recentemente ci ha scritto riguardo il led del Desire HD : di seguito La informiamo che i colori del lED disponibili sono il Verde, Rosoo e Rosso arancione , per sviluppare altri Led Le suggeriamo di visitare il sito www.htcdevelopers.com.

The led is red, green and orange.

Rodomar705.

Translation by Mod:
Hello xxxx, Thank you for contacting our technical support. Our aim 'to offer a high quality service and answer all your questions. Recently we wrote about led the Desire HD: Please note that the following LED colors available are Green, Orange and Red Roso, to develop other Led suggest you visit the site www.htcdevelopers.com.

Sent from my Desire HD using Tapatalk

Multi-colour LED Development

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