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dagitap
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« on: February 02, 2008, 11:12:25 AM » |
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sir/mam, nagcascade po ako ng 12 pcs na 8x8 matrix pero it seemd na mas malinaw ung display ng kalahating 6 pcs kesa sa haf na 6pcs. ung mas malinaw na parte e ung mas malapit sa controller ckt. ano un, nagkakaloss? suposedly ala diba? i used 74LS374 buffer register and 74LS164 serial in parallel out shift registers and 330 ohms in this panel. it should display characters na pantay pantay ang tingkad ng ilaw diba? bakit kaya nagkaganun? help...
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« on: February 02, 2008, 11:12:25 AM » |
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paranz
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« Reply #1 on: February 02, 2008, 11:44:06 AM » |
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conductor loss perhaps? what wire are you using to provide power? how long is it?
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toasted siopao
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« Reply #2 on: February 02, 2008, 11:55:30 AM » |
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Scanning naman ang display mo di ba? Na check mo ba ang timing?
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dagitap
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« Reply #4 on: February 03, 2008, 08:19:59 PM » |
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pano nga po pala magattach ng image dito? d po kasi ako marunong.. using html po ba? hehehe... para maatach ko po ckt diagram po para di magulo... thanks nga po pala sa help
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Siramiko
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« Reply #5 on: February 03, 2008, 08:39:46 PM » |
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microlan2008
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« Reply #6 on: February 05, 2008, 02:33:43 PM » |
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any update para sa 12 8x8 matrix display?
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dagitap
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« Reply #7 on: February 07, 2008, 08:54:56 AM » |
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 yan po ung block diagram ng controller ckt |
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dagitap
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« Reply #8 on: February 07, 2008, 09:00:00 AM » |
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ay, maliit pala ung pic... hehehe...
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dagitap
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« Reply #9 on: February 07, 2008, 09:25:07 AM » |
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 ayan na po ung block diagram ng matrix panel  yan namn po ung ckt diagram ng panel  block diagrm ng controller ckt  ckt diagram ng controller ckt |
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Born2BeWired
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« Reply #10 on: February 07, 2008, 09:47:19 AM » |
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Much easier to see the whole thing pag may schematic!  Hmmm., Bakit floating yung emitter ng mga PN200 mo?  Dapat nakakabit sa 5V yan.. Please check and let us know.  |
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dagitap
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« Reply #11 on: February 08, 2008, 12:22:58 AM » |
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ay, naputol po kasi... hehehe... eto na po para buo na. sana malinaw ung pic  |
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dagitap
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« Reply #12 on: February 08, 2008, 12:24:33 AM » |
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baka po kaya malabo ung ibang LED di po kaya dahil un sa BJT? kasi ndi even ung distribution ng current sa mga elements?
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Siramiko
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« Reply #13 on: February 08, 2008, 06:37:50 AM » |
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suggest lang upload mo na lang yung mismong file ,para mapagaaral ng mg master  ,sobrang liit ng diagram |
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Born2BeWired
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« Reply #14 on: February 08, 2008, 10:09:55 AM » |
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Well, the schematic is a bit small, but is good enough for our troubleshooting.. dagitap, please check the following: If the brightness gradually falls with distance from your controller board, then paranz proposition is probably right. You can check this further by turning OFF the displays near the controller, kung lumiwanag ang nasa dulo, ito na nga! The cure is simple. Add jumper wire (AWG18) to connect the +5V and GND bus of the last matrix (pinakamalayo sa controller) directly across your 7805 regulator output. (wait... 78L05 ang nakalagay?  Palitan mo ng 7805 w/ heatsink, di kaya ng 78L05 ang circuit mo. Maaring ito rin ang dahilan.) If the brightness falls abruptly and about equal with each half (6 matrix), then glenjoy proposition is more plausible. Software and timing problem na ito. |
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Electronics <- Once you got a taste of it, you will never get enough.
Insanity <- Doing the same thing, expecting different results.
Arrogance is directly proportional to Ignorance.
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creedcradle
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« Reply #15 on: February 08, 2008, 02:36:34 PM » |
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sir/mam, nagcascade po ako ng 12 pcs na 8x8 matrix pero it seemd na mas malinaw ung display ng kalahating 6 pcs kesa sa haf na 6pcs
eto yung kalimitang nagiging pitfall natin... nacompute mo na ba ang theoritical sink at source current values? sir/mam, nagcascade po ako ng 12 pcs na 8x8 matrix pero it seemd na mas malinaw ung display ng kalahating 6 pcs kesa sa haf na 6pcs. ung mas malinaw na parte e ung mas malapit sa controller ckt. ano un, nagkakaloss? suposedly ala diba? i used 74LS374 buffer register and 74LS164 serial in parallel out shift registers and 330 ohms in this panel. it should display characters na pantay pantay ang tingkad ng ilaw diba? bakit kaya nagkaganun? help...
ano un, nagkakaloss? suposedly ala diba? 1. MALI. consider voltage drop and current sink/source flow. kaya humihina ang kalahati niyan kasi ung first 3 BJTs mo ay kumakain ng kabuuang optimal current para sa BJT functions mo... 2. di kaya ang refresh rate mo sa matrix scans mo ay hindi compatible sa refresh rate ng matrix display mo... 3. at ang huli change your programming structure... maaring isa sa mga dahilan ay ang loop functions mo it should display characters na pantay pantay ang tingkad ng ilaw diba? bakit kaya nagkaganun? help...
sa debugger ng utak natin ... feasible.. pero sa hardware configurations hindi yon ganun kadali -hope these helpz -creedcradle |
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dagitap
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« Reply #16 on: February 08, 2008, 08:59:44 PM » |
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thanks for the tips. try ko po palitan ng 7805. mejo iba iba kasi po ang malabong LED sa matrix.minsan ung 1ng row, minsan ung gitnang matrix, kasi po per line of 12 matrices, may 1ng controller. 6 lines po un so 6 controllers din. pag pnagpapalit2 namin ung controllers, iba iba din ung mga part na malabo ang ilaw. minsan sa matrix na malapit sa controller depende kung alin sa 6 controllers ang gamitin namin. kung palitan po kaya namin ng mosfet ung bjt? impractical po ba? thanks po tlga sa mga ideas... try po namin i-aply lahat ng turo nyo. |
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Siramiko
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« Reply #17 on: February 08, 2008, 10:02:27 PM » |
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palagay ko depende yan character na nakadisplay kaya malabo , pagmaraming led ang buhay na hihirapan ang transistor na pailawin lahat.
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creedcradle
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« Reply #18 on: February 09, 2008, 09:47:01 AM » |
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mejo iba iba kasi po ang malabong LED sa matrix.minsan ung 1ng row, minsan ung gitnang matrix,
Yup. definitely this is an issue on programming structure . e.g refresh rate/clock cycle or loops scan inconsistency that the matrix display can not respond appropriately... pag pnagpapalit2 namin ung controllers, iba iba din ung mga part na malabo ang ilaw. minsan sa matrix na malapit sa controller depende kung alin sa 6 controllers ang gamitin namin.
uulitin ko, change the programming structure.. kung palitan po kaya namin ng mosfet ung bjt? huwag mo ng palitan.. okay na yan... ang problem jan is the scan loop organization mo sa program mo.. sa tingin ko, nakapattern ka sa zilog matrix scan documentation noh? advise ko sayo huwag mong gayahin yun... search the web for other programming structures.. trust me... it will work... -creedcradle |
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toasted siopao
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« Reply #19 on: February 09, 2008, 10:58:44 AM » |
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ay, naputol po kasi... hehehe... eto na po para buo na. sana malinaw ung pic Bakit kakaunti ang transistors? Ilang amps ba consumption na ng system mo? 1A or 1.5 A ba ang 7805? Check mo ang routine ng scanning mo. |
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July 28, 2008, 07:01:56 PM
