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  1. #1
    Join Date
    Apr 2007
    Location
    Pennsylvania, USA
    Posts
    139

    Default Addressable RGB LED's & LED strips

    Has anyone messed with the addressable RGB LED strips based on the WS2812 5050 led's?

    https://www.sparkfun.com/products/12027

    I am interested in trying one of these, if anyone has any tips to get started on driving these things it is much appreciated. Looks like timing is critical to controlling these things.

    The data transfer protocol use single NZR communication mode. After the pixel power-on reset, the DIN port receive data from controller, the first pixel collect initial 24bit data then sent to the internal data latch, the other data which reshaping by the internal signal reshaping amplification circuit sent to the next cascade pixel through the DO port. After transmission for each pixel,the signal to reduce 24bit. pixel adopt auto reshaping transmit technology, making the pixel cascade number is not limited the signal transmission, only depend on the speed of signal transmission.
    Shawn

  2. #2
    Join Date
    Nov 2005
    Location
    Bombay, India
    Posts
    859

    Default Re: Addressable RGB LED's & LED strips

    Hello Shawn

    I have done a project using similar led chains. These, however, are done using a relative of the WS2812 you mention. The IC controller I worked with is the SM16716. These leds are pretty easy to control. If you search a bit, you will find a bit of code for each type of IC. Timing is not critical.

    This is how the leds are controlled. (arduino code)
    Code:
    static void show() {
      digitalWriteFast(DATA_PIN, LOW);
      for (int i = 0; i < 50; i++) {
        toggle_clock();
      }
      for (int i = 0; i < LIGHT_COUNT; ++i) {
        write_pixel(i);
      }
      write_blank_pixel();
      delay(1);
    }

  3. #3
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    Pennsylvania, USA
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    139

    Default Re: Addressable RGB LED's & LED strips

    As far as I can tell the SM16716 has 2 wires for communication, where the WS2812 only has one. To send a 0 bit you must drive the data pin high for 0.35us and then low for 0.8us. For a 1 bit you drive the data pin high for 0.7us then low for 0.6us. If the data line is low for longer then 50us the strip will reset. I am going to get one and play with it, I will post some code when I get one working

    Datasheet
    Shawn

  4. #4
    Join Date
    Jun 2006
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    California
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    33

    Default Re: Addressable RGB LED's & LED strips

    The translation for the data sheet is a little difficult to follow, it would be nice if there was a better explanation.

  5. #5
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    Pennsylvania, USA
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    139

    Default Re: Addressable RGB LED's & LED strips

    Quote Originally Posted by DavidK View Post
    The translation for the data sheet is a little difficult to follow, it would be nice if there was a better explanation.
    Agreed! I will have a string on Friday to play with.
    Shawn

  6. #6

    Default Re: Addressable RGB LED's & LED strips

    SPCW pointed this thread out to me on mine, so, i'll fetch what i've got over here...

    I purchased 10 of the little chips off ebay. Becarefull with the chips when soldering them as they are extremely sensitive to heat... I think i've killed 4 out of the 10

    The constant current chip is the WS2811. The chip itself has two speeds, 400KHz or 800KHz. the WS2812 runs at 400KHz and the WS2812B runs at 800KHz.
    Communication to these devices is via a daisy chain with a NRZ type wave form. Each chip has 3 channels with 8 bit PWM.
    So, at 800KHz to send a 1 bit you send a high pulse of duration 0.8uS and the a low of 0.45uS.
    To send a 0 bit you send a high pulse of durations 0.4uS and then a low of 0.85uS.
    Total bit lenght is 1.25uS +-300nS
    The timing tolerances are +-150nS

    Now, the arduino's run entire strings of these things with the MCU running at 8MHz so one would think a 64MHz 18F46K22 would not have an issue...

    However, when i kick out a sequence manually like this...

    Code:
        LATD.0 = 1
    ASM
        nop
        nop
        nop
        nop
        nop
        nop
        nop
        nop
        nop
        nop
    ;10
        nop
        nop
        nop
        nop
        nop
        nop
        nop
        nop
        nop
        nop
    ;20
        nop
        nop
        nop
        nop
        nop
        nop
        nop
        nop
        nop
        nop
    ;30
        nop
        nop
        nop
        nop
        nop
        nop
        nop
        nop
    ;38
    
    
    ENDASM    
        LATD.0 = 0
    ASM
        nop
        nop
        nop
        nop
        nop
        nop
        nop
        nop
        nop
        nop
    ;10
        nop
        nop
        nop
        nop
        nop
        nop
        nop
        nop
        nop
        nop
    ;20
        nop
        nop
        nop
        nop
        nop
        nop
        nop
        nop
        nop
    ;29
    
    ENDASM
    Everything works fine. Even using GOSUB's to the on and off bit subroutines works without an issue after a little trimming by trial and error (as above).
    However, as soon as i use any sort of IF statement to read from an array, all the timings seem to go out the window and i can not adjust it enough to compensate.

    My calcs say that the 46K22 @ 64MHz makes 64 instructions per uS.
    Even if i cut off all the NOP's from the off time trailing sequence the pic still can not make the calculations (IF condition) within the required time.

    I have tried everything i can think of so far...

    I look forward to people's responses.

  7. #7
    Join Date
    Apr 2013
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    2

    Default Re: Addressable RGB LED's & LED strips

    Hi, everyone have a example how to use the WS2812 with a PICBASIC and Microchip microcontroller? Thanks!!!!

  8. #8

    Default Re: Addressable RGB LED's & LED strips

    Happy New Year to everybody... I buy a 240 leds strips of ws2812b, waiting for the controllers, that had a big delay from asia y buy a arduino to put this lights in action, but I think that I preffer use this lights with PICs, this is the reason why I am here. How is this program doing? Update? Thanks...

  9. #9
    ainsley's Avatar
    ainsley Guest

    Default Re: Addressable RGB LED's & LED strips

    You did not say what the pic voltage was , but assuming it at 5v i would connect the one side of the probe to the 5v and then to a resistor to ground and connect the joined point o the AN0 anaolog port

  10. #10
    Join Date
    Aug 2010
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    11

    Default Re: Addressable RGB LED's & LED strips

    I ebay'd a couple of 60 led/m strips as I am interested in making a "wearable" safety vest for when I am biking. I played with a trinket - which worked fine in its limited capacity - but I wanted more and didnt want to learn another language. I hooked up an oscilloscope and tried getting the code in to light up a single led but PBP and a 16F819 @ 20mHZ coding was not fast enough for the WS2811 timing requirements. I tried using an asm subroutine within PBP for writing to the WS2811's and voila - but no time left for calculations. So, I started reading, more reading, finally ran across a thread with this link to an ASM file which uses the SPI in a 16F767 for a single LED:

    http://wiki.hacdc.org/index.php?titl...asm&oldid=8964

    This guy (credits to David Kaufman) did a great job - I just adjusted config and pic# to my chip and was running in a couple minutes. Few minutes later I had the entire strand running. So I guess my plan is to try and go back to PBP and try to write my calculations out and then call his ASM subroutine for addressing to the led's. Thats the plan anyways - I am a horrible programmer - so if anyone else goes this route and wants to post some code so I can learn more efficient coding and tricks I would be most grateful!!

  11. #11
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    Pennsylvania, USA
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    Default Re: Addressable RGB LED's & LED strips

    If you get something working please share it I had zero luck controlling these things.
    Shawn

  12. #12
    Join Date
    Aug 2010
    Posts
    11

    Default Re: Addressable RGB LED's & LED strips

    This file is entirely in assembly (I'm not sure how to call assembly subroutines from PBP). The author taught how to light a single RGB, my progress to date is the start of a chaser so it will light 60 rgb's sequentially and do some color shifting (Still lots to learn here). Should load right up in MPLAB (v8.9 used) The changes you may need to make for it to run:

    your chip (must have SPI and 20Mhz)
    your chip config settings
    change nLED for your length of string (60)
    scroll down to delay subroutines to speed up, slow down ...

    The original author taught how to light a single LED. You will easily detect my coding as the extent of my assembly knowledge when I opened his program was nop!ColorStripTest_819.txt

  13. #13
    Join Date
    Feb 2008
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    Michigan, USA
    Posts
    200

    Default Re: Addressable RGB LED's & LED strips

    Any one had any luck yet? I just picked up a 8x string and want to play with them. The SPI sounds like and interesting approach.
    Bo

  14. #14
    Join Date
    Nov 2006
    Location
    Murrieta, CA
    Posts
    59

    Cool Re: Addressable RGB LED's & LED strips

    WOW, Nobody has provided code for an LED strip yet !?!?!?!?

    Ok guys i will have working code for you before the weeks out. im thinking multi-color knight rider... sounds interesting. I will be using my trusty PIC16F877A Dev boards.

    Till then, happy coding !
    www.RFEFX.com
    Special Effects at your Fingertips

  15. #15
    Join Date
    Feb 2013
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    Quebec, Canada
    Posts
    62

    Default Re: Addressable RGB LED's & LED strips

    This technique is very interesting:
    Tutorial on Programming the NeoPixel (WS2812) RGB LEDs

    I'll test it with my oscilloscope someday...

  16. #16
    Join Date
    Mar 2005
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    CROATIA
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    36

    Default Re: Addressable RGB LED's & LED strips

    Hi,
    actually I had idea to put few passive component for making one-shout for short period and one shut for longer period
    after that i timed mssp module to average carrier frequency (positive + negative periode) this can be done using add register i done it with 16f1827 + internal osc +PLL
    intention was to make it on both MSSP modules, but i have problem using both paralell.....
    ok, this is working, and now timing and hw-accelerated sending is piece of cake for basic timings.....
    but i miss memory, so i have to port all onto 46k22 which is still dual mssp internal 64mhz, cheap, need to read erratas frequently but almost always there is workaround
    why more memory ? because i want to have ability to change any led, so you need 3 byte per led, and for 100 leds, this is 300 byte of ram....

    this days i obtained psoc4 and i want to organize UDB module for hardware accelerator for sw led, but ah.... this is totally hardCore

    http://www.element14.com/community/b...ioneer-dev-kit
    noone for now is'n sharing code/project, so i can learn from working project.... there is actually other shared article as arduino or others...

    i hope i at least point you in some direction....
    reagards

  17. #17
    Join Date
    Nov 2006
    Location
    Murrieta, CA
    Posts
    59

    Default Re: Addressable RGB LED's & LED strips

    Well guys..

    I have been messing around with this issue all weekend.

    Still working on the timing control.. very tight timing needed to drive these strips.

    till then.. happy coding.
    www.RFEFX.com
    Special Effects at your Fingertips

  18. #18
    Join Date
    Feb 2008
    Location
    Michigan, USA
    Posts
    200

    Default Re: Addressable RGB LED's & LED strips

    The link that MichelJasmin posted is interesting in the the author found that the ON timing was the most critical, and the OFF time didn't seem to affect it. I would like to play with this more when I'm not busy with other things.

    Mark

  19. #19
    Join Date
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    Quebec, Canada
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    Default Re: Addressable RGB LED's & LED strips

    I need your help. I've converted the Tutorial on Programming the NeoPixel to PICBASIC. Iím using a PIC18F25K22 at 40MHz. I get the right timings (400ns & 800ns) but I donít have a NeoPixel! Iíve ordered a Led strip from AliExpress but it takes one month to get itÖ

    So, if anyone of you can give it a try please. Keep the data line as short as possible with a short ground return. This will improve the rise and fall time. The nice thing about these pixels is when data is forwarded, it is passed through the internal reshaping mechanism. (Ref: Understanding the WS2812 ).

    Thanks!

    Code:
    '****************************************************************
    '*  Name    : NeoPixel                                           
    '*  Author  : Michel Jasmin                                           
    '*  Notice  : Copyright (c) 2014
    '*          : All Rights Reserved                               
    '*  Date    : 2014-08-13                                           
    '*  Version : 1.0                                               
    '*  Notes   :                                                   
    '*          :                                                   
    '****************************************************************
    'PIC18F25K22
    
    #CONFIG
            __CONFIG    _CONFIG1H, _FOSC_HSHP_1H & _PLLCFG_OFF_1H & _PRICLKEN_ON_1H & _FCMEN_ON_1H & _IESO_ON_1H
            __CONFIG    _CONFIG2H, _WDTEN_OFF_2H
            __CONFIG    _CONFIG3H, _PBADEN_ON_3H & _CCP2MX_PORTB3_3H  & _MCLRE_EXTMCLR_3H
            __CONFIG    _CONFIG4L, _STVREN_OFF_4L & _LVP_OFF_4L & _XINST_OFF_4L
            __CONFIG    _CONFIG5L, _CP0_ON_5L & _CP1_ON_5L & _CP2_ON_5L & _CP3_ON_5L
            __CONFIG    _CONFIG5H, _CPB_ON_5H & _CPD_ON_5H
    #ENDCONFIG
    
    DEFINE OSC 40   
    DEFINE NO_CLRWDT 1  ' Don't waste cycles clearing WDT
    
    '------------ ALIAS -------------------------
    LedPin      VAR LATC.3
    NeoPin      VAR LATC.5
    
    '------------ Const -------------------------
    NEO_NUM     CON 60
    CR CON 13
    LF CON 10
    
    '------------ Variables -------------------------
    NeoGreen    VAR BYTE[NEO_NUM]
    NeoBlue     VAR BYTE[NEO_NUM]
    NeoRed      VAR BYTE[NEO_NUM]
    NeoPixel    VAR BYTE
    BitCount    VAR BYTE
    TempW       VAR WORD
    
    'Flags
    AppFlags    VAR BYTE
    DataBit     VAR AppFlags.0
    
    
    '------------------------  Initialization -------------------------------
    
    Clear   ' Clear RAM before entry
    
    TRISC.3 = 0 'Led Pin
    TRISC.5 = 0 'NeoPin
    TRISC.6 = 1 'TX1
    TRISC.7 = 1 'RX1
    
    'The serial port is used only for debugging purpose.
    RCSTA = $90   ' Enable serial port & continuous receive
    TXSTA = $24   ' Enable transmit, BRGH = 1
    SPBRG = 17    ' 9600 Baud @ 40 MHz -0.03%
    SPBRGH = 4
    BAUDCON.3 = 1 ' Enable 16 bit baudrate generator
    
    PAUSE 100
    
    HSEROUT [CR,LF,CR,LF,"Test NeoPixel v 17",CR,LF]
    
    'Blink a LED just to say: Hello, I'm alive!
    LedPin = 0
    FOR TempW = 0 TO 4
        TOGGLE LedPin
        PAUSE 250
    NEXT
    LedPin = 0
    
    DataBit = 0
    GOSUB NeoInit
    
    '------------ Main program -------------------------
    Main:
    
        'For testing purpose:
        'DataBit = 1
        'GOSUB NeoBit
        'GOTO Main
    
        GOSUB NeoDraw
        GOSUB NeoRotate
        PAUSE 25
        GOTO Main
    
    END
    
    NeoBit:
        IF DataBit = 1 THEN
            '400ns pulse required
            NeoPin = 1
    
            '3 nop = 500ns @ 32MHz
            '2 nop = 376ns @ 32MHz
    
            '2 nop = 300ns @ 40MHz
            '3 nop = 400ns @ 40MHz
    
            ASM
                nop
                nop
                nop
            ENDASM
            NeoPin = 0
    
        ELSE
            '800ns pulse required
            NeoPin = 1
    
            '5 nop = 740ns @ 32MHz
            '6 nop = 880ns @ 32MHz
    
            '6 nop = 700ns @ 40MHz
            '7 nop = 800ns @ 40MHz
    
            ASM
                nop
                nop
                nop
                nop
                nop
                nop
                nop
            ENDASM
            NeoPin = 0
        ENDIF
    
        RETURN
    
    
    NeoInit:
        FOR NeoPixel = 0 TO NEO_NUM
    
            IF NeoPixel < 10 THEN
                NeoGreen[NeoPixel] = 0
                NeoBlue[NeoPixel] = 0
                NeoRed[NeoPixel] = 64
    
            ELSEIF NeoPixel < 20 THEN
                NeoGreen[NeoPixel] = 0
                NeoBlue[NeoPixel] = 64
                NeoRed[NeoPixel] = 0
    
            ELSEIF NeoPixel < 30 THEN
                NeoGreen[NeoPixel] = 0
                NeoBlue[NeoPixel] = 64
                NeoRed[NeoPixel] = 64
    
            ELSEIF NeoPixel < 40 THEN
                NeoGreen[NeoPixel] = 64
                NeoBlue[NeoPixel] = 0
                NeoRed[NeoPixel] = 0
    
            ELSEIF NeoPixel < 50 THEN
                NeoGreen[NeoPixel] = 64
                NeoBlue[NeoPixel] = 0
                NeoRed[NeoPixel] = 64
            ELSE
                NeoGreen[NeoPixel] = 64
                NeoBlue[NeoPixel] = 64
                NeoRed[NeoPixel] = 0
            ENDIF
    
        NEXT
    
        RETURN
    
    NeoDraw:
        FOR NeoPixel = 0 TO NEO_NUM
            FOR BitCount = 7 TO 0 STEP -1
                DataBit = NeoGreen.0[NeoPixel * BitCount]
                GOSUB NeoBit
            NEXT
    
            FOR BitCount = 7 TO 0 STEP -1
                DataBit = NeoRed.0[NeoPixel * BitCount]
                GOSUB NeoBit
            NEXT
    
            FOR BitCount = 7 TO 0 STEP -1
                DataBit = NeoBlue.0[NeoPixel * BitCount]
                GOSUB NeoBit
            NEXT
    
        NEXT
    
        NeoPin = 0
    
        RETURN
    
    NeoRotate:
        FOR NeoPixel = 0 TO (NEO_NUM - 1)
            NeoGreen[NeoPixel] = NeoGreen[NeoPixel + 1]
            NeoBlue[NeoPixel] = NeoBlue[NeoPixel + 1]
            NeoRed[NeoPixel] = NeoRed[NeoPixel + 1]
        NEXT
    
        NeoGreen[NEO_NUM - 1] = NeoGreen[0]
        NeoBlue[NEO_NUM - 1] = NeoBlue[0]
        NeoRed[NEO_NUM - 1] = NeoRed[0]
    
        RETURN

  20. #20
    Join Date
    Feb 2013
    Location
    Quebec, Canada
    Posts
    62

    Default Re: Addressable RGB LED's & LED strips

    Made a few mistakes, sorry...

    Code:
    '****************************************************************
    '*  Name    : NeoPixel                                           
    '*  Author  : Michel Jasmin & The Signal Path dot com BLOG
    '*  Notice  : Ref: The Signal Path dot com BLOG
    '*          : Tutorial on Programming the NeoPixel (WS2812) RGB LEDs
    '*          : http://thesignalpath.com/blogs/2014/07/14/watcheditdeletetutorial-on-programming-the-neopixel-ws2812-rgb-leds-equipment-giveaway/
    '*  Date    : 2014-08-13                                           
    '*  Version : 1.0                                               
    '*  Notes   :                                                   
    '*          :                                                   
    '****************************************************************
    'PIC18F25K22 @40MHz
    
    #CONFIG
            __CONFIG    _CONFIG1H, _FOSC_HSHP_1H & _PLLCFG_OFF_1H & _PRICLKEN_ON_1H & _FCMEN_ON_1H & _IESO_ON_1H
            __CONFIG    _CONFIG2H, _WDTEN_OFF_2H
            __CONFIG    _CONFIG3H, _PBADEN_ON_3H & _CCP2MX_PORTB3_3H  & _MCLRE_EXTMCLR_3H
            __CONFIG    _CONFIG4L, _STVREN_OFF_4L & _LVP_OFF_4L & _XINST_OFF_4L
            __CONFIG    _CONFIG5L, _CP0_ON_5L & _CP1_ON_5L & _CP2_ON_5L & _CP3_ON_5L
            __CONFIG    _CONFIG5H, _CPB_ON_5H & _CPD_ON_5H
    #ENDCONFIG
    
    DEFINE OSC 40   
    DEFINE NO_CLRWDT 1  ' Don't waste cycles clearing WDT
    
    '------------ ALIAS -------------------------
    LedPin      VAR LATC.3
    NeoPin      VAR LATC.5
    
    '------------ Const -------------------------
    NEO_NUM     CON 60
    CR CON 13
    LF CON 10
    
    '------------ Variables -------------------------
    NeoGreen    VAR BYTE[NEO_NUM]
    NeoBlue     VAR BYTE[NEO_NUM]
    NeoRed      VAR BYTE[NEO_NUM]
    NeoPixel    VAR BYTE
    BitCount    VAR BYTE
    TempW       VAR WORD
    
    'Flags
    AppFlags    VAR BYTE
    DataBit     VAR AppFlags.0
    
    
    '------------------------  Initialization -------------------------------
    
    Clear   ' Clear RAM before entry
    
    TRISC.3 = 0 'Led Pin
    TRISC.5 = 0 'NeoPin
    TRISC.6 = 1 'TX1
    TRISC.7 = 1 'RX1
    
    'The serial port is used only for debugging purpose.
    RCSTA = $90   ' Enable serial port & continuous receive
    TXSTA = $24   ' Enable transmit, BRGH = 1
    SPBRG = 17    ' 9600 Baud @ 40 MHz -0.03%
    SPBRGH = 4
    BAUDCON.3 = 1 ' Enable 16 bit baudrate generator
    
    PAUSE 100
    
    HSEROUT [CR,LF,CR,LF,"Test NeoPixel v 18",CR,LF]
    
    'Blink a LED just to say: Hello, I'm alive!
    LedPin = 0
    FOR TempW = 0 TO 4
        TOGGLE LedPin
        PAUSE 250
    NEXT
    LedPin = 0
    
    DataBit = 0
    GOSUB NeoInit
    
    '------------ Main program -------------------------
    Main:
    
        'For testing purpose:
        'DataBit = 1
        'GOSUB NeoBit
        'GOTO Main
    
        GOSUB NeoDraw
        GOSUB NeoRotate
        PAUSE 25
        GOTO Main
    
    END
    
    NeoBit:
        IF DataBit = 1 THEN
            '400ns pulse required
            NeoPin = 1
    
            '3 nop = 500ns @ 32MHz
            '2 nop = 376ns @ 32MHz
    
            '2 nop = 300ns @ 40MHz
            '3 nop = 400ns @ 40MHz
    
            ASM
                nop
                nop
                nop
            ENDASM
            NeoPin = 0
    
        ELSE
            '800ns pulse required
            NeoPin = 1
    
            '5 nop = 740ns @ 32MHz
            '6 nop = 880ns @ 32MHz
    
            '6 nop = 700ns @ 40MHz
            '7 nop = 800ns @ 40MHz
    
            ASM
                nop
                nop
                nop
                nop
                nop
                nop
                nop
            ENDASM
            NeoPin = 0
        ENDIF
    
        RETURN
    
    NeoInit:
        FOR NeoPixel = 0 TO (NEO_NUM - 1)
    
            IF NeoPixel < 10 THEN
                NeoGreen[NeoPixel] = 0
                NeoBlue[NeoPixel] = 0
                NeoRed[NeoPixel] = 64
    
            ELSEIF NeoPixel < 20 THEN
                NeoGreen[NeoPixel] = 0
                NeoBlue[NeoPixel] = 64
                NeoRed[NeoPixel] = 0
    
            ELSEIF NeoPixel < 30 THEN
                NeoGreen[NeoPixel] = 0
                NeoBlue[NeoPixel] = 64
                NeoRed[NeoPixel] = 64
    
            ELSEIF NeoPixel < 40 THEN
                NeoGreen[NeoPixel] = 64
                NeoBlue[NeoPixel] = 0
                NeoRed[NeoPixel] = 0
    
            ELSEIF NeoPixel < 50 THEN
                NeoGreen[NeoPixel] = 64
                NeoBlue[NeoPixel] = 0
                NeoRed[NeoPixel] = 64
            ELSE
                NeoGreen[NeoPixel] = 64
                NeoBlue[NeoPixel] = 64
                NeoRed[NeoPixel] = 0
            ENDIF
    
        NEXT
    
        RETURN
    
    NeoDraw:
        FOR NeoPixel = 0 TO (NEO_NUM + 1)
            TempW = (NeoPixel * 8)
    
            FOR BitCount = 7 TO 0 STEP -1
                DataBit = NeoGreen.0[TempW + BitCount]
                GOSUB NeoBit
            NEXT
    
            FOR BitCount = 7 TO 0 STEP -1
                DataBit = NeoRed.0[TempW + BitCount]
                GOSUB NeoBit
            NEXT
    
            FOR BitCount = 7 TO 0 STEP -1
                DataBit = NeoBlue.0[TempW + BitCount]
                GOSUB NeoBit
            NEXT
    
        NEXT
    
        NeoPin = 0
    
        RETURN
    
    NeoRotate:
        FOR NeoPixel = 0 TO (NEO_NUM - 1)
            NeoGreen[NeoPixel] = NeoGreen[NeoPixel + 1]
            NeoBlue[NeoPixel] = NeoBlue[NeoPixel + 1]
            NeoRed[NeoPixel] = NeoRed[NeoPixel + 1]
        NEXT
    
        NeoGreen[NEO_NUM - 1] = NeoGreen[0]
        NeoBlue[NEO_NUM - 1] = NeoBlue[0]
        NeoRed[NEO_NUM - 1] = NeoRed[0]
    
        RETURN

  21. #21

    Default Re: Addressable RGB LED's & LED strips

    Ordered strip recently, will see how this code works

  22. #22
    Join Date
    Mar 2003
    Location
    Commerce Michigan USA
    Posts
    1,026

    Default Re: Addressable RGB LED's & LED strips

    Hey CuriousOne, Have a look at this thread.
    http://www.picbasic.co.uk/forum/showthread.php?t=19694
    Dave Purola,
    N8NTA
    EN82fn

  23. #23

    Default Re: Addressable RGB LED's & LED strips

    Well, all this is way too complicated.

    I wanted something simple, to drive single rgb led via 1 pin

  24. #24
    Join Date
    Dec 2017
    Posts
    1

    Default Re: Addressable RGB LED's & LED strips

    you can use the digital strips with the built-in programs,
    most digital led controllers can support the ws2812,sk6812 led,
    or the Remote controller with program inside,it is much easy,
    also the T-1000s,t300k controller are available too,use the lededit software to create the color changing effect,

  25. #25
    Join Date
    Mar 2005
    Location
    CROATIA
    Posts
    36

    Default Re: Addressable RGB LED's & LED strips

    Hi,
    best HW driven solution, which i use for years, is that you use SPI internal hw,
    you can make SPI2NRZ circuit with few external parts, digital way (74xxx) or
    analog https://hackaday.com/2014/02/04/ws28...-and-passives/
    like this, i had to tune resistors, for better voltage variation tolerance, but work like this to.

    so, when you have hardware helper, and internal hardware, then you can paly in interrupt later.

    for first step you have to initialise MSSP hardvare on 800kbs with propper flags and registers
    based on your clock and device datasheet. (yes you have to read it few time until get proper setings)
    i actualy deal with 2 mssp paralell in interrupt, so i have time in main loop to play with other things.


    Code:
    for WS_CNT = 0 to number_of_ws
        SSP2BUF = R1[WS_CNT]
        SSP1BUF = R2[WS_CNT]
        SSP1IF  = 0
    ' something litle can feet here if interrupt... i have serial receive routine..
      WHILE SSP1IF = 0 : WEND
        SSP2BUF = G1[WS_CNT]
        SSP1BUF = G2[WS_CNT]
        SSP1IF  = 0
    ' something litle can feet here if interrupt... i have serial receive routine..
      WHILE SSP1IF = 0 : WEND
        SSP2BUF = B1[WS_CNT]
        SSP1BUF = B2[WS_CNT]
        SSP1IF  = 0
    ' something litle can feet here if interrupt... i have serial receive routine..
      WHILE SSP1IF = 0 : WEND
    next WS_CNT
    pauseus 60 ' for latch....
    i hope you will understund directions, i have large code which i optimise for my work, so i
    don't want to share it, but trust me this part i shared is core, all other is playing with it...

    acrually , on slower pic, you can expirience for/next too slow, you can use goto instead, and
    of course, today pic speed is 32mhz+ with internal rc osc+pll, already on .5$ parts, so forget
    old 16f84 parts for this, use kind of 18f46k22 or 16f1827 or part like this....

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