[help] countdown 9-0 then repeating using jk flip flop sa 7 segment display

[drawde5]

patulong  nman po ako sa project nmin...sino po nkkalam nito////kelangan ko po ung circuit diagram ska ung mga kelangan pang iba.....san po may tumulong sken...please help!!

[zer0w1ng]

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


This is 0 to 7 but you can deduce from it how is 9-0 done.

Another way, which is easier, is to use 4 stage ripple counter and decoder gates for the display.
http://www.eelab.usyd.edu.au/digital_tutorial/part2/counter02.html

[marcelino]

You PMed that you intend to make use of J-K flip flop...

the easier way sa tingin ko ay ang gumamit ng state machine....

@EPKq_jROHinK9=M=5i>G>jAA=Aihaqojbmnj_mAmaAl;7j>@2LO=C;kg0KA70$<J5S<J6;g7tEBAE=G7tANA8J:O:PC7s,'{0|KH=E>9EEJFD;<F5;1 t(h@EIG

download that one. decode it using "elab" as key here: http://www.seabreezecomputers.com/encrypter/

there is a sample design regarding a gray code which loops repeatedly (chapter 10.2). you could also make you own however 7 bits na. it however used D f/f. gamitin mo nalang ang exitation table for JK F/F.

even better if you could use a BCD to seven segment IC para ang given states ay 4 bits lang and would be as simple counter...

[drawde5]

@marcelino

di ko nman madecrypt ndi ko mkuha

[ultrasonic™]

subscribing  nlng 

(^_^)

[marcelino]

@marcelino

di ko nman madecrypt ndi ko mkuha

paste mo yung whole length of characters... then put "elab" dun sa key then decrypt.

bawal kasi dito magpost ng mga materials na di naman natin sarili.

[drawde5]

ggmiten dw ung 555 timer ic ska ung 7447 decoder////ska ung 7473 ic jk flipflop////
4 bits yata///o ewan!!


ptulong nman sa circuit diagram///

basta continous ung countdown nya from 9-0///paulit ulit lng sya////

[drawde5]

eto po lumlbas oh


wu,&I0F-'xEI#ix(teEx~nF{xm|D@2MJB3IIB0I{E2|GrgFxwb(*tsvF?`'{n`_v"e/v"fvBnE!|xux"nE|)xh&t'j,}nDgaS`X& m!xpu!%}tvv}evkWEcCwu%"

[marcelino]

1D96b^S=@GRY<8&8.4R)8=S,2<*TY`ZZ[aVY[^V,^`*W,6S)115:.B$VX/4,(/l';¶
4<';5$R(s.-2D&2(s*9273%@99.(rtql/e69<.)*D.57C$'74${pspS1D22

[drawde5]

nadl ko n po/////haizzztttt   anhirap intindhin

[marcelino]

nadl ko n po/////haizzztttt   anhirap intindhin

wag mo nang intindihin yung about vhdl coding... hanggang dun ka lang schematic design.

basically:
1. define the sequence
2. identify the next state.
3. input it to the flip flop.... how would the flip-flop reacts with the given transistion.
4. solve the relationship using karnaugh maps...
5. solve na!

try ko mamaya... just don't have time.

luluto pa ako ng dinner!!! hehehe

[ultrasonic™]

OT:  kau  na bhala  sis marcelino    (^_^)

[marcelino]

mga kaibigan... kanina lang nagdesign ako ng counter (synchronous). counts from 0-9 in BCD form and using jk f/f.

mataas ang percent na sa tingin ko tama ang design ko... pero di nagwork sa proteus!!!

eto pakidouble check naman...

Code: [Select]

JK flip flop Excitation Table
Transition JK
=========================
0 → 0 0X
0 → 1 1X
1 → 0 X1
1 → 1 X0
=========================

Present         Next JK[3]         JK[2] JK[1] JK[0]
================================================================
0 0000 0001 0X 0X 0X 1X
1 0001 0010 0X 0X 1X X1
2 0010 0011 0X 0X X0 1X
3 0011 0100 0X 1X X1 X1
4 0100 0101 0X X0 0X 1X
5 0101 0110 0X X0 1X X1
6 0110 0111 0X X0 X0 1X
7 0111 1000 1X X1 X1 X1
8 1000 1001 X0 0X 0X 1X
9 1001 0000 X1 0X 0X X1
----------------------------------------------------------------
A 1010 XXXX XX XX XX XX
B 1011 XXXX XX XX XX XX
C 1100 XXXX XX XX XX XX
D 1101 XXXX XX XX XX XX
E 1110 XXXX XX XX XX XX
F 1111 XXXX XX XX XX XX


AFTER kmapping:
J3 = Q2Q1Q0
K3 = Q0

J2 = Q1Q0
K2 = Q1Q0

J1 = Q3’Q0
K1 = Q0

J0 = 1
K0 = 1


and the circuit:


saan??? saan kaya ako nagkamali??? heheh

gusto ko sanang tulungan si drawde, gusto ko bigyan sya ng procedure by providing an example... pero from 0 - 9 yung count.

[marcelino]

hehehehe

sorry. ngayon ko lang din nakita... mali pala ang connection ko ng outputs ko... nabaliktad ko yung connection sa BCD to sevensegment decoder.

here is the corrected.

[ultrasonic™]

hehehehe

sorry. ngayon ko lang din nakita... mali pala ang connection ko ng outputs ko... nabaliktad ko yung connection sa BCD to sevensegment decoder.

here is the corrected.

ayon uu  nga,  kaya  pala
ang  linaw  ng mata  nyu  jejejeje

@sis  marcelino   yan ang mga indication na  TAO  lng  nga  tayo

(^_^),V,,  peace

[marcelino]

hehehe... tama ka dyan!

di ko masyado pinansin, connect lang ng connect! hehehehe

sana madeduce na ni TS ang assignment nya dyan! nwei same procedure lang naman.

medyo matagal na akong di nakapagcalculate ng ganyan... sarap pa din sa feeling!!! especially yung part ng kmapping!
kaya nga kaninang pag-gising ko, binalikan ko talga.

[drawde5]

@ marcelino

sensya n po ngaun lng ako ulit nkabisita dito////

mejo binaha kc////

sana mpgana ko po ung ngwa nyo...///



slamat po ng marami

[marcelino]

@ marcelino

sensya n po ngaun lng ako ulit nkabisita dito////

mejo binaha kc////

sana mpgana ko po ung ngwa nyo...///



slamat po ng marami

note: that is counting upwards... you will have to design your own.  i may have already illustrated the procedure.

[Bell]

OT:kaya pala ilang beses kong nakita si sir marce na nagbabasa ng K-mapping...dahil dito.ang tiyaga naman po. kapagod din ang k-mapping ha...

[marcelino]

OT:kaya pala ilang beses kong nakita si sir marce na nagbabasa ng K-mapping...dahil dito.ang tiyaga naman po. kapagod din ang k-mapping ha...

review na din...

teka, saan mo ako nakitang nagbabasa? hahahah
are you spying me?