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Author Topic: HELP!!! logic experts..........  (Read 1409 times)

Offline rinkashe

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HELP!!! logic experts..........
« on: March 25, 2012, 11:15:18 AM »
.......kailangan po namin nang project sa logic namin tungkol po sa queuing system na may 0-99 ang COUNTER,.........gusto po sa aming INSTRUCTOR ng dalawang TELLER........pero separate yung DISPLAY nang bawat TELLER, example, nag press si TELLER1 (display ni teller1 ay 1), nag press si TELLER2( Display ni teller2 ay 2), separate po ang kanilang DISPLAY pero CONTINUE ang kanilang COUNTING,, parang katulad po ng sa bangko.... hope matulungan nyo kami... SALAMAT PO...   ???

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HELP!!! logic experts..........
« on: March 25, 2012, 11:15:18 AM »

Offline motion55

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Re: HELP!!! logic experts..........
« Reply #1 on: March 25, 2012, 01:45:31 PM »
Simple lang yan. Isang 2 digit counter lang. Naka OR ang mga buttons ng mga teller sa clock input and of course with the right debounce and lock out.

Ang 2 x 4 BCD output ng counter ay pupunta sa 8 bit latch ng bawat teller. Bale dalawang 8-bit latch para sa dalawang teller. Bawat latch output will be connected to a 2-digit display driver. Kung sinong teller pumindot, sa kanyang latch ay ma-clocked to update her display.

Pakawalan mo ang nakakulong na utak mo.
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Re: HELP!!! logic experts..........
« Reply #1 on: March 25, 2012, 01:45:31 PM »

Offline PlCUSER

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Re: HELP!!! logic experts..........
« Reply #2 on: March 25, 2012, 01:57:15 PM »
Pakawalan mo ang nakakulong na utak mo.
at ugaliing mag inom ng ovaltine. ;D ;D ;D

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Re: HELP!!! logic experts..........
« Reply #2 on: March 25, 2012, 01:57:15 PM »

Offline rinkashe

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Re: HELP!!! logic experts..........
« Reply #3 on: March 25, 2012, 08:37:24 PM »
salamat po sir..............pwede po follow up question?????? baguhan pa kasi ako tapos fresh pa po sakin ang mga words na iyong ginagamit.. para san po yong right debounce and lock out?? at yong  latch ano po yon???? and the possoble IC'S na dapat gamitin sa project na ito. salamat po....................

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Re: HELP!!! logic experts..........
« Reply #3 on: March 25, 2012, 08:37:24 PM »

Offline motion55

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Re: HELP!!! logic experts..........
« Reply #4 on: March 25, 2012, 09:26:21 PM »
Pag dinertso mo switch sa clock input ng counter para mag increment by 1,  pwede more than 1 ang increment dahil sa mechanical properties ng switch. May talbog sa contacts ng switch at multiple times mag increment ang counter.

As for lock out, pwede kasi mag sabay ang dalawang teller sa pindot ng button. Dapat ang naunang teller discable ang kabilang teller habang nakapindut siya. Hindi masyado important sa simula. Pwede kayo gumawa ng walang lock out. Pero sa testing madidiskubre mo ang ganitong problema.

Standard 74xxx TTL devices ang gamitin mo. Ikaw na pumili kung aling BCD (decimal) counter ang hilig mo. Pwede 74273 or 74374 d-type latches.
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Re: HELP!!! logic experts..........
« Reply #4 on: March 25, 2012, 09:26:21 PM »

Offline rinkashe

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Re: HELP!!! logic experts..........
« Reply #5 on: March 25, 2012, 10:05:19 PM »
ah so yong lock out po sir is somewhat like priiority.. ? at ano naman po yong debounce?? salamat po sir

Offline motion55

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Re: HELP!!! logic experts..........
« Reply #6 on: March 25, 2012, 10:28:00 PM »
Debounce = pang tanggal ng switch bounce. GMG.
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Offline rinkashe

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Re: HELP!!! logic experts..........
« Reply #7 on: March 25, 2012, 10:36:28 PM »
ah ok sir so pang prevent siya for multiple pulses na ma produce in every electrical contact sa switch. at sir pag mag debounce  can inuse circuit from the internet? like 555 timer switch debouncer??

Offline rdpzycho

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Re: HELP!!! logic experts..........
« Reply #8 on: March 25, 2012, 10:45:28 PM »
just read the description ng makikita mong debounce circuit sa internet, it can even be just a simple RC circuit. try experimenting kung ano ang pinaka-effective or cost-effective para sa application niyo.
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Offline rinkashe

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Re: HELP!!! logic experts..........
« Reply #9 on: March 25, 2012, 11:04:28 PM »
sir ito bang 8bit latch is it a decoder?

Offline carlsfootprints

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Re: HELP!!! logic experts..........
« Reply #10 on: March 25, 2012, 11:24:49 PM »
baka makatulong sayo maintindihan ung sinasabi ni sir motion55..

http://circuitdesolator.blogspot.com/2011/01/logic-based-digital-queuing-system.html
never saturate..

Offline akositado

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Re: HELP!!! logic experts..........
« Reply #11 on: March 26, 2012, 07:08:54 AM »
pa sub ako... basa basa mode... :D

Offline motion55

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Re: HELP!!! logic experts..........
« Reply #12 on: March 26, 2012, 09:26:57 AM »
sir ito bang 8bit latch is it a decoder?

Diba binigay ko na 74273, 74374? GMG, download at magbasa ng datasheet.

http://www.google.com/search?q=74ls273

http://www.google.com/search?q=74ls374

http://en.wikipedia.org/wiki/List_of_7400_series_integrated_circuits

Mga ganitong problems, parang jigsaw puzzle yan. Mahirap ma solve lahat kaagad. Mas madali gawin ninyo muna mga parteng naintindihan. Pag may partial circuit na kayo, makakatulong para maintindihan yung ibang parte. Like I said, parang jigsaw puzzle.

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Offline rinkashe

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Re: HELP!!! logic experts..........
« Reply #13 on: March 29, 2012, 07:30:55 PM »
sir na try na namin yong binigay mo na hint.ang problemt a lahat nang display ay 5 . at di  siya nag count up.. ano po problema non..bukas na namin ipasa. please help.

Offline rinkashe

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Re: HELP!!! logic experts..........
« Reply #14 on: March 29, 2012, 08:17:45 PM »
sir ano kaya problema non??? dipo siya na count up tapos stable ang kanyang state.. kailangan namin matapos ngayon please help

Offline motion55

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Re: HELP!!! logic experts..........
« Reply #15 on: March 29, 2012, 08:26:25 PM »
Post your schematics para mabigyan ng comment. Kahit link beginning with hxxp para ma post ninyo,
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Offline rinkashe

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Re: HELP!!! logic experts..........
« Reply #16 on: March 30, 2012, 08:40:59 AM »

 sir ito po ang picture nang aming schematic..  salamat po sir

Offline motion55

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Re: HELP!!! logic experts..........
« Reply #17 on: March 30, 2012, 08:58:00 AM »
74192 is an UP/DOWN counter. Hmmm.... One problem is ang teller #1 naka clock sa UP count input. At ang teller #2 ay naka clock sa DOWN clock input. Dapat naka OR sila sa UP count lang. But I like the debounce circuit you made.
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Re: HELP!!! logic experts..........
« Reply #18 on: March 30, 2012, 09:11:40 AM »
importante yong debouncer baka bigla nalang tatalon yong priority number ng counter posibleng magsuntokan ang mga customer ng banko dahil sa tagal ng hintayan na bypass pa ang numero nila  :D :D :D

you may try 74ls221 sa debouncer para wlang mintis (see datasheet)
It's difficult to see the picture when you're inside the frame.

Offline rinkashe

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Re: HELP!!! logic experts..........
« Reply #19 on: March 30, 2012, 11:55:44 AM »
sir bali sa left side na push button bali yan ang count up ng bawat teller at sa kabila ay ang count down ng bawat teller. tag iisa sila ng push button..

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Re: HELP!!! logic experts..........
« Reply #19 on: March 30, 2012, 11:55:44 AM »

 

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