pahelp mga master. push button problem

[o0oyaskaio0o]

pahelp naman po para sa activity nmen sa school, ilan days ko na din kc eto pinagiisipan. till now wala pa din ako kasagutan,

push button problem po, pag hold ng button dapat display agad sa seven segment and pag release ng pb, dapat po andun pa din sa seven segment un display,, nawawala po kc kapag nirelease ko na un pb.
eto po un simple diagram ko,,

thank u po, more power.

 

[ultrasonic™]

may requirement ba ang activity assignment  mu na yan ?
i mean limitation kng ilang parts lang ang gagamitin...

kasi kng NC (normally open) push button lang at ganyan ang connection ay  tlgang  hndi  maghohold  yan after ng pagrelease.... 

[motion55]

Para ma save ang pushbutton state, kailangan gumamit ng memory devices like flip-flops or latches.

However, paano ma-trigger ang pag save? Pag pinindot isang button? Paano pag dalawang button "sabay" pinindot? Suppose, nauna isang button at habang nakapindot ito, pumindot pa ng pangalawang button? Kahit sabihin mo "sabay" pinindot, pwede magkaroon ng difference ng ilang nanoseconds.

[o0oyaskaio0o]

may requirement ba ang activity assignment  mu na yan ?
i mean limitation kng ilang parts lang ang gagamitin...

bsta po pure logic gates po un gagamitin, .ok lan po un. thanks

[o0oyaskaio0o]

However, paano ma-trigger ang pag save? Pag pinindot isang button? Paano pag dalawang button "sabay" pinindot? Suppose, nauna isang button at habang nakapindot ito, pumindot pa ng pangalawang button? Kahit sabihin mo "sabay" pinindot, pwede magkaroon ng difference ng ilang nanoseconds.

ok lan po kahit my difference, as long as tama po un mkuha output,, my reset din po kc eto, pang 5 button sya, bali pag nka high un input A display 1 then reset back to zero po ule, kapag synchronous po un pindot, iadd po ng decoder, input A,B,C, D nka high = 15, no display sa segment, reset nlng po ule para back to zero,
any j & k or D ff pde po gamitin, para po un circuit nun?
Thanks Master Motion.

[motion55]

ok lan po kahit my difference, as long as tama po un mkuha output,, my reset din po kc eto, pang 5 button sya, bali pag nka high un input A display 1 then reset back to zero po ule, kapag synchronous po un pindot, iadd po ng decoder, input A,B,C, D nka high = 15, no display sa segment, reset nlng po ule para back to zero,
any j & k or D ff pde po gamitin, para po un circuit nun?
Thanks Master Motion.

Well luminaw na. You will need 4 S-R (set-reset) flip-flops. Isa sa bawat pushbutton A B C & D. Bale bawat button will be connected to each SET input and all the reset inputs will connected to a common reset pushbutton.

Kahit anung J-K or D type flip-flop pwede gamitin as long as may set and reset inputs. Or pwede rin gumawa using NAND or NOR gates.

[o0oyaskaio0o]

Well luminaw na. You will need 4 S-R (set-reset) flip-flops. Isa sa bawat pushbutton A B C & D. Bale bawat button will be connected to each SET input and all the reset inputs will connected to a common reset pushbutton.

thanks po master motion, gagawin ko po eto, meron ako dito 74ls76 j-k ff with clear and preset,.
almost same pa din po ba un circuit nun? nkashort un J-k sa each input then un clear at preset san ko po ikokonek? Thanks

[RaffT]

or you can use SCR(latching purposes) kung ayaw mo ng logic gates

[o0oyaskaio0o]

or you can use SCR(latching purposes) kung ayaw mo ng logic gates

logic gates lan po pde gamitin, nway try ko na lang un  NAND Gate SR Flip-Flop,,. thanks.

[o0oyaskaio0o]

You will need 4 S-R (set-reset) flip-flops. Isa sa bawat pushbutton A B C & D. Bale bawat button will be connected to each SET input and all the reset inputs will connected to a common reset pushbutton.

master motion, thank u so much po,, nagawa ko na using nand Gate SR Flip-Flop. marame thanks po Ule.

[ultrasonic™]

ayos  na  pala...  congratz 

[o0oyaskaio0o]

ayos  na  pala...  congratz 

thanks po,,