Comments on: RGB matrica: 1 bito frame buferis http://www.vabolis.lt/2008/09/16/rgb-matrica-1-bito-frame-buferis/ (originalios biokronikos, nė lašo copy-paste) Fri, 18 May 2012 11:04:26 +0000 http://wordpress.org/?v=1.5.2 Comment on RGB matrica: 1 bito frame buferis by: Administrator http://www.vabolis.lt/2008/09/16/rgb-matrica-1-bito-frame-buferis/#comment-1185 Tue, 23 Sep 2008 16:34:15 +0000 http://www.vabolis.lt/2008/09/16/rgb-matrica-1-bito-frame-buferis/#comment-1185 Sorry, I'll not sell you the board as I already fixed it- just resoldered Cyclone and everything is OK. Sorry, I'll not sell you the board as I already fixed it- just resoldered Cyclone and everything is OK.

]]> Comment on RGB matrica: 1 bito frame buferis by: Ian http://www.vabolis.lt/2008/09/16/rgb-matrica-1-bito-frame-buferis/#comment-1184 Tue, 23 Sep 2008 02:31:20 +0000 http://www.vabolis.lt/2008/09/16/rgb-matrica-1-bito-frame-buferis/#comment-1184 I have the same goal, but I am doing it in Verilog and trying to learn that really well at the same time. This could be considered my first FPGA project. Would you be interested in selling the non-working board you have? I have the same goal, but I am doing it in Verilog and trying to learn that really well at the same time. This could be considered my first FPGA project.

Would you be interested in selling the non-working board you have?

]]> Comment on RGB matrica: 1 bito frame buferis by: Administrator http://www.vabolis.lt/2008/09/16/rgb-matrica-1-bito-frame-buferis/#comment-1181 Mon, 22 Sep 2008 14:35:42 +0000 http://www.vabolis.lt/2008/09/16/rgb-matrica-1-bito-frame-buferis/#comment-1181 Yes, I bought my boards from evilmadscience. Currently I am out of my "hobby funds"- need to sell some useless stuf in ebay to collect some free money :) As this is my second project in FPGA I am making many errors. Also, I think I've made my design to complicated :) My goal is to make the matrix as comple static device- just load RGB data to internal frame buffer and forget it. Yes, I bought my boards from evilmadscience. Currently I am out of my “hobby funds"- need to sell some useless stuf in ebay to collect some free money :)

As this is my second project in FPGA I am making many errors. Also, I think I've made my design to complicated :) My goal is to make the matrix as comple static device- just load RGB data to internal frame buffer and forget it.

]]> Comment on RGB matrica: 1 bito frame buferis by: Ian http://www.vabolis.lt/2008/09/16/rgb-matrica-1-bito-frame-buferis/#comment-1180 Mon, 22 Sep 2008 03:23:40 +0000 http://www.vabolis.lt/2008/09/16/rgb-matrica-1-bito-frame-buferis/#comment-1180 Enjoy your blog. You should update the english version with your led matrix works. :) Some tips (that I got from kevtris) 1) Don't do brightness control by pwming your output enables. Not fast enough and it makes a mess. 2) *Do* brightness control just as a part of your PWM stepping for each row. 3) Make sure to clear each row as the last step, otherwise capacitance on the outputs will cause ghost images to appear on unlit leds in adjacent rows. I'm still learning fpgas and am actually writing my controller for this board in verilog. FYI, evil mad science has started to sell a different variant. I purchased one that is on the way to me, but there are more in stock. http://cgi.ebay.com/24X32-768-RGB-FULL-COLOR-SMD-LED-BILLBOARD-DISPLAY-BRD_W0QQitemZ190253874466QQcmdZViewItem?hash=item190253874466&_trkparms=72%3A1207¦39%3A1¦66%3A2¦65%3A12¦240%3A1318&_trksid=p3286.c0.m14 Did you purchase yours on ebay? Enjoy your blog. You should update the english version with your led matrix works. :)

Some tips (that I got from kevtris)
1) Don't do brightness control by pwming your output enables. Not fast enough and it makes a mess.
2) *Do* brightness control just as a part of your PWM stepping for each row.
3) Make sure to clear each row as the last step, otherwise capacitance on the outputs will cause ghost images to appear on unlit leds in adjacent rows.

I'm still learning fpgas and am actually writing my controller for this board in verilog.

FYI, evil mad science has started to sell a different variant. I purchased one that is on the way to me, but there are more in stock.

http://cgi.ebay.com/24X32-768-RGB-FULL-COLOR-SMD-LED-BILLBOARD-DISPLAY-BRD_W0QQitemZ190253874466QQcmdZViewItem?hash=item190253874466&_trkparms=72%3A1207|39%3A1|66%3A2|65%3A12|240%3A1318&_trksid=p3286.c0.m14

Did you purchase yours on ebay?

]]> Comment on RGB matrica: 1 bito frame buferis by: Administrator http://www.vabolis.lt/2008/09/16/rgb-matrica-1-bito-frame-buferis/#comment-1173 Wed, 17 Sep 2008 19:26:01 +0000 http://www.vabolis.lt/2008/09/16/rgb-matrica-1-bito-frame-buferis/#comment-1173 Baltos spalvos balanso problemos. Labiausiai tai "raudonos spalvos balanso" problemos. <img src='/stuff/20080917a.jpg' alt='White balance' /> Baltos spalvos pokyčiai kai užsidega visi diodai mikroschemoje. <img src='/stuff/20080917b.jpg' alt='White balance' /> Raudona spalva labiausiai "sėda"... Baltos spalvos balanso problemos. Labiausiai tai “raudonos spalvos balanso" problemos.

White balance
Baltos spalvos pokyčiai kai užsidega visi diodai mikroschemoje.

White balance
Raudona spalva labiausiai “sėda"…

]]> Comment on RGB matrica: 1 bito frame buferis by: Administrator http://www.vabolis.lt/2008/09/16/rgb-matrica-1-bito-frame-buferis/#comment-1172 Wed, 17 Sep 2008 15:03:55 +0000 http://www.vabolis.lt/2008/09/16/rgb-matrica-1-bito-frame-buferis/#comment-1172 Mikroschema "programuojasi" su keliais išoriniais rezistoriais (Output current adjusted through an external resistor). Mane kiek neramina pimas punktas- kodėl sėda diodai kai uždegi visus 16 diodų... O dėl vienai spalvai ir ar logaritminis-tiesinis valdymas? Bus toks koki suprogramuosiu. :) Sita dalis dar nepadaryta. Mikroschema “programuojasi" su keliais išoriniais rezistoriais (Output current adjusted through an external resistor).

Mane kiek neramina pimas punktas- kodėl sėda diodai kai uždegi visus 16 diodų…

O dėl vienai spalvai ir ar logaritminis-tiesinis valdymas? Bus toks koki suprogramuosiu. :) Sita dalis dar nepadaryta.

]]> Comment on RGB matrica: 1 bito frame buferis by: FoxIS http://www.vabolis.lt/2008/09/16/rgb-matrica-1-bito-frame-buferis/#comment-1171 Wed, 17 Sep 2008 10:48:28 +0000 http://www.vabolis.lt/2008/09/16/rgb-matrica-1-bito-frame-buferis/#comment-1171 del skirtingu WB(wite balance). tiksliai neprisimenu ka raso sioje ploksteje naudojamu led draiveriu pdf'uose(ir tingiu ieskot to pdfo), bet daugumoje current source led driveriuose su pwm valdymo galimybe galima nustatyti tam tikru budu(per vidinius registrus, per isorines grandines) sroves korekcijas. bent jau kiek teko dometis tai daugumoje rgb lentynu yra tai padaryta vienaip ar kitaip (na bent jau seno modulio pakeitimo nauju atveju)... siulau paziureti idemiau datasheetus , gal ir surasi kur nors buda daryti mikroschemu kalibracija :) o del zalios spalvos tai tikriausiai virsyta leistina vidutine srove per dioda arba tiesiog nekokybiskas diodas. kiek zinau zaliems diodams reikia mazesnes sroves kad jie sviestu tokiu pat intensyvumu kaip ir raudoni pvz. beje, o kiek bituku vienai spalvai teoriskai galima realizuoti su tuo fpga ? ir valdymas logaritminis ar tiesinis ?:) del skirtingu WB(wite balance).
tiksliai neprisimenu ka raso sioje ploksteje naudojamu led draiveriu pdf'uose(ir tingiu ieskot to pdfo), bet daugumoje current source led driveriuose su pwm valdymo galimybe galima nustatyti tam tikru budu(per vidinius registrus, per isorines grandines) sroves korekcijas.
bent jau kiek teko dometis tai daugumoje rgb lentynu yra tai padaryta vienaip ar kitaip (na bent jau seno modulio pakeitimo nauju atveju)…

siulau paziureti idemiau datasheetus , gal ir surasi kur nors buda daryti mikroschemu kalibracija :)

o del zalios spalvos tai tikriausiai virsyta leistina vidutine srove per dioda arba tiesiog nekokybiskas diodas. kiek zinau zaliems diodams reikia mazesnes sroves kad jie sviestu tokiu pat intensyvumu kaip ir raudoni pvz.

beje, o kiek bituku vienai spalvai teoriskai galima realizuoti su tuo fpga ?
ir valdymas logaritminis ar tiesinis ?:)

]]> Comment on RGB matrica: 1 bito frame buferis by: Administrator http://www.vabolis.lt/2008/09/16/rgb-matrica-1-bito-frame-buferis/#comment-1169 Tue, 16 Sep 2008 20:48:46 +0000 http://www.vabolis.lt/2008/09/16/rgb-matrica-1-bito-frame-buferis/#comment-1169 Kaip ir maniau, klaida buvo MSBasic programoje. Va fotkė su pakoreguota programa: <img src='/stuff/20080916b.jpg' alt='' /> Ir dar paveiksliuką kiek perpaišiau... :) Kaip ir maniau, klaida buvo MSBasic programoje. Va fotkė su pakoreguota programa:

Ir dar paveiksliuką kiek perpaišiau… :)

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