1. New to Christmas lighting? Get started with the AusChristmasLighting 101 Manual:
    auschristmaslighting.com/wiki/AusChristmasLighting-101

Pixels (Probably not WS2811) -- Challenge for Pixel Detectives

Discussion in 'RGB Lights - Intelligent Pixels and 3-Channel RGB' started by eurbani, Nov 23, 2013.

  1. eurbani

    eurbani Lights at Lowes Island

    Joined:
    Nov 23, 2013
    Messages:
    6
    Likes Received:
    0
    Location:
    Sterling, VA
    Find Me On:
    Hello,


    I recently acquired some pixels that were portrayed as WS2811 pixels.


    I already have WS2811 pixels and controllers for them. This is what I know. Can anyone tell me what kind of pixels these might be.


    Physical - 12mm pixels, Each pixel has a control board and a chip, wires are red, green and white.


    Connection - I confirmed that the input for the pixels is on the IC side (unlike the WS2811 chips that I have). White is ground (-), Red is 5VDC, Green is data.


    Behavior - When connected to a WS2811 controller


    Channel 1, Pixel 1, color pulsing redChannel 2, Pixel 1, color red with dim pulsing greenChannel 3, Pixel 1, color greenChannel 4, Pixel 1, color pulsing blue
    Channel 5, Pixel 1, color dim blue AND Pixel 2, color dim pulsing red
    Channel 6, Pixel 2, color redChannel 7, Pixel 2, color pulsing greenChannel 8, Pixel 2, color green with dim blueChannel 9, Pixel 2, color blueChannel 10, Pixel 3, color pulsing red...

    [font=arial, helvetica, sans-serif]Testing - I used the diode tester on my multimeter and read these values (voltage drop, I guess)


    no chip side
    [font=arial, helvetica, sans-serif]
    Green Red White


    Green 0.742 1.51
    Red 1.4 1.38
    White 0.634 0.525

    [/font]
    [font=arial, helvetica, sans-serif]
    chip side
    Green Red White
    Green 1 1
    Red 1 1.58
    White 1 0.522

    [/font]


    [font=arial, helvetica, sans-serif]OK detectives. What kind of Pixels are these? I know that they are not WS2801 because each pixel has 3 inputs and 3 outputs. Any ideas? Is there anything that I can test to determine what I have? [/font]

    [font=arial, helvetica, sans-serif]Things that I have[/font]

    [font=arial, helvetica, sans-serif]- WS2801 controller (5V) [/font]
    [font=arial, helvetica, sans-serif]- WS2811 controller (5V)[/font]
    [font=arial, helvetica, sans-serif]- Mulitmeter[/font]
    [font=arial, helvetica, sans-serif]- Various power supplies[/font]
    [font=arial, helvetica, sans-serif]- DMX cross-over cable[/font]
    [font=arial, helvetica, sans-serif]- LOR USB485[/font]
    [font=arial, helvetica, sans-serif]- LOR S3 software[/font]
    [font=arial, helvetica, sans-serif](I have other things, but I think that these are the most useful to help figure this out.)[/font]



    [/font]
     
  2. David_AVD

    David_AVD Bite my shiny metal ass!

    Joined:
    Jun 12, 2010
    Messages:
    3,408
    Likes Received:
    43
    Location:
    Victoria Point (Brisbane)
    Find Me On:
    Maybe cut one open and check what's written in the chip?
     
  3. OP
    OP
    eurbani

    eurbani Lights at Lowes Island

    Joined:
    Nov 23, 2013
    Messages:
    6
    Likes Received:
    0
    Location:
    Sterling, VA
    Find Me On:

    Great idea!


    Here is a photo. I can clearly make out LPD


    I can't make out the numbers. Is there anything besides an LPD 6803?


    Has anyone here ever connected a 6803 string to a WS2811 controller? What happened? Do LPD 6803 strings have 3 wires?




    [​IMG]
     
  4. David_AVD

    David_AVD Bite my shiny metal ass!

    Joined:
    Jun 12, 2010
    Messages:
    3,408
    Likes Received:
    43
    Location:
    Victoria Point (Brisbane)
    Find Me On:
    Not enough pins for 2801 or 6803. 2811 is a likely candidate. I've sliced the silicone off pixels before to get a better look at the chip text.
     
  5. OP
    OP
    eurbani

    eurbani Lights at Lowes Island

    Joined:
    Nov 23, 2013
    Messages:
    6
    Likes Received:
    0
    Location:
    Sterling, VA
    Find Me On:

    Thanks David. I'm pretty sure it isn't a WS2811. I have some experience with those and this one doesn't function like a WS2811.


    I found this [SIZE=78%]http://www.doityourselfchristmas.com/wiki/index.php?title=Pixel_Wiring_Colors[/SIZE] and it seems that WS2811, TM1804 and TM1809 are the only ones that use three wires.
     
  6. David_AVD

    David_AVD Bite my shiny metal ass!

    Joined:
    Jun 12, 2010
    Messages:
    3,408
    Likes Received:
    43
    Location:
    Victoria Point (Brisbane)
    Find Me On:
    TM1803 & TM1804 are 8 pin. There are two different speed versions of the 2811 as well.
     
  7. OP
    OP
    eurbani

    eurbani Lights at Lowes Island

    Joined:
    Nov 23, 2013
    Messages:
    6
    Likes Received:
    0
    Location:
    Sterling, VA
    Find Me On:
    I am being told that they at LPD1886. That seems to match up with the label on the chip.


    Question is.. "WTF is LPD1886?" :)
     
  8. sck1ng

    sck1ng Apprentice Elf

    Joined:
    Oct 23, 2013
    Messages:
    77
    Likes Received:
    0
  9. David_AVD

    David_AVD Bite my shiny metal ass!

    Joined:
    Jun 12, 2010
    Messages:
    3,408
    Likes Received:
    43
    Location:
    Victoria Point (Brisbane)
    Find Me On:

Share This Page