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Author Topic: HELP! Alarm for Digital Clock  (Read 2391 times)

Offline ken2t

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HELP! Alarm for Digital Clock
« on: May 08, 2009, 09:32:53 PM »
can you please give us your idea how to display
ALARM and CURRENT TIME, using or not using multiplexers..

using TTL..we are using 4 Seven Segment Displays for both hours and minutes

12:00

this should how it works: for ex, your current time is 12:00AM and we want to set the alarm at 12:30AM, by using for example a switch we can change the display to its ALARM mode, and then after switching it again, the 7SegDisplay should display the current time..

we appreciate your help..
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HELP! Alarm for Digital Clock
« on: May 08, 2009, 09:32:53 PM »

Offline ultrasonic™

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Re: HELP! ALARM for DIGITAL CLOCK
« Reply #1 on: May 08, 2009, 09:48:09 PM »
Quote from: ken2t on May 08, 2009, 09:32:53 PM
can you please give us your idea how to display
ALARM and CURRENT TIME, using or not using multiplexers..

using TTL..we are using 4 Seven Segment Displays for both hours and minutes

12:00

this should how it works: for ex, your current time is 12:00AM and we want to set the alarm at 12:30AM, by using for example a switch we can change the display to its ALARM mode, and then after switching it again, the 7SegDisplay should display the current time..

we appreciate your help..


kailangan pa bang ipakita sa 7segment display yung alarm set-up?
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Re: HELP! ALARM for DIGITAL CLOCK
« Reply #1 on: May 08, 2009, 09:48:09 PM »

Offline ken2t

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Re: HELP! ALARM for DIGITAL CLOCK
« Reply #2 on: May 08, 2009, 10:13:22 PM »
opo..
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Re: HELP! ALARM for DIGITAL CLOCK
« Reply #2 on: May 08, 2009, 10:13:22 PM »

Offline maldihtah13

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Re: HELP! ALARM for DIGITAL CLOCK
« Reply #3 on: May 09, 2009, 11:08:20 AM »
Pwede kayo mag-add ng isang LED indicating that the clock is in alarm setting. Pwede rin nman patigillin nyo yung colon sign to indicate na alarm setting mode kayo, then blink the colon every second in normal time mode.
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Re: HELP! ALARM for DIGITAL CLOCK
« Reply #3 on: May 09, 2009, 11:08:20 AM »

Offline akhen

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Re: HELP! ALARM for DIGITAL CLOCK
« Reply #4 on: May 09, 2009, 12:33:52 PM »
Mukhang yung kailangan nyo ay merong MODE button. Yung tipong may alarm mode at current time mode tama po ba?
In that case, mukhang kumplekado yan using logic gates. Mas madali ata yan using MCU.
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Re: HELP! ALARM for DIGITAL CLOCK
« Reply #4 on: May 09, 2009, 12:33:52 PM »

Offline ken2t

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Re: HELP! ALARM for DIGITAL CLOCK
« Reply #5 on: May 09, 2009, 06:05:29 PM »
un nga po ung concept e.. the problem is we dont know how to implement it..our professor told us that it's posible with the use of MUX..any idea mga Sir?with or without using MUX

tnx for your opinions..
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Offline ken2t

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Re: HELP! ALARM for DIGITAL CLOCK
« Reply #6 on: May 09, 2009, 06:46:32 PM »
Quote from: akhen on May 09, 2009, 12:33:52 PM
Mukhang yung kailangan nyo ay merong MODE button. Yung tipong may alarm mode at current time mode tama po ba?
In that case, mukhang kumplekado yan using logic gates. Mas madali ata yan using MCU.


Using TTL po e..Logic gates lng
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Offline the_next_big_name

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Re: HELP! ALARM for DIGITAL CLOCK
« Reply #7 on: May 09, 2009, 06:57:40 PM »
i think madali lang yun kung mcu na lang gamitin nyo plus rtos para di kayo mahirapan...mapaka-common nyan kase
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Offline ken2t

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Re: HELP! ALARM for DIGITAL CLOCK
« Reply #8 on: May 09, 2009, 07:53:27 PM »
kung marunong lng kami gamit MCU bkt hndi..pure TTL lng, may alarm mode may time mode, nka relay switches un pareho..tas hiwalay p ung ALARM on/off..bale 5 switches ang gamit..

1. ALARM on/off (SPDT)
2. ALARM mode (relay switch)
3. TIME mode (relay switch)
4. HOUR (tack switch)
5. MINUTE (tack switch)

thanks po s opinions, we appreciate it..
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Offline ultrasonic™

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Re: HELP! ALARM for DIGITAL CLOCK
« Reply #9 on: May 09, 2009, 10:10:10 PM »
Quote from: ken2t on May 09, 2009, 07:53:27 PM
kung marunong lng kami gamit MCU bkt hndi..pure TTL lng, may alarm mode may time mode, nka relay switches un pareho..tas hiwalay p ung ALARM on/off..bale 5 switches ang gamit..

1. ALARM on/off (SPDT)
2. ALARM mode (relay switch)
3. TIME mode (relay switch)
4. HOUR (tack switch)
5. MINUTE (tack switch)

thanks po s opinions, we appreciate it..


hmmm...  medjo complikado tlaga kng TTL  kaysa sa MCU..


kung kailangan mung e-dispaly  yung Alarm set-up niya,   kailangan mu ng seperate switches to change the Display set-up for clock time & alarm set-up

:D
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Offline ken2t

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Re: HELP! ALARM for DIGITAL CLOCK
« Reply #10 on: May 09, 2009, 10:43:29 PM »
kpag ma set ng alarm, i hohold po ung relay switch nung alarm mode tapos ung display ma switch din sa alarm mode, kapag hinold off naman, bumabalik sa current time..ung ang part na mahirap kaya dun kmi humihingi ng ideas..same lng din sa pag set ng current time, gamit ung relay switch..

thanks sa opinions.. ^^
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Offline ultrasonic™

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Re: HELP! ALARM for DIGITAL CLOCK
« Reply #11 on: May 09, 2009, 10:56:26 PM »
functional na poh ba yung clock timer ninyu?  or meron na kayung sariling design

can u post here para dun nalang kami kukuha ng ideas  (^_^)

para ma-improvised nalang..

kung wala naman....   kami nalang magpost ng clock timer..  :D :D :D :D :D
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Offline ken2t

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Re: HELP! ALARM for DIGITAL CLOCK
« Reply #12 on: May 10, 2009, 03:18:11 PM »
popost nlng po namin ung schematic nung 12hr clock nmin..

dun sa clock timer nyo po, mas maganda po kung ipopost neo din ung schematic..

ang balak po kasi namin sa timer gumamit ng 74LS121 one-shot timer..mkakatulong din po ung sa timer neo..

pa help din pala po sa pag set up nung 74LS121 para sa clock pulse, para magsakton 1 second ang pulse..

thanks..
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Offline the_next_big_name

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Re: HELP! ALARM for DIGITAL CLOCK
« Reply #13 on: May 10, 2009, 06:56:16 PM »
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Offline SpongeBob

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Re: HELP! ALARM for DIGITAL CLOCK
« Reply #14 on: May 10, 2009, 07:19:13 PM »
Tama mga masters, madali lang kung pwede microcontroller.
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Offline ken2t

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Re: HELP! ALARM for DIGITAL CLOCK
« Reply #15 on: May 11, 2009, 05:25:14 PM »
sad to say MCU is not allowed to use in our project..we use 74LS90 Decade counters for the digiclock..

please, we badly need help..

thanks a lot..
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Offline ultrasonic™

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Re: HELP! ALARM for DIGITAL CLOCK
« Reply #16 on: May 11, 2009, 11:23:49 PM »
Quote from: ken2t on May 11, 2009, 05:25:14 PM
sad to say MCU is not allowed to use in our project..we use 74LS90 Decade counters for the digiclock..

please, we badly need help..

thanks a lot..

fixed na poh ba to?   decade counter 74LS90 lang ba..,  wala na bang ibang option binigay ang teacher nyu?

kung wala na ...   sisimulan na naming mag-brain storming  :D :D :D :D :D
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Offline ken2t

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Re: HELP! ALARM for DIGITAL CLOCK
« Reply #17 on: May 12, 2009, 02:17:16 PM »
yes. 74LS90 decade counters gamit, tapos gumamit din kami flipflop (74LS112) para sa AM/PM, allowable khit anung TTL gamitin and other logic gates....

thanks po ulit..
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Offline ken2t

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Re: HELP! ALARM for DIGITAL CLOCK
« Reply #18 on: May 12, 2009, 03:51:19 PM »
e2 po ung digiclock namin may alarm na, kaso gumagamit ng 8 7_seg_display, gus2 sana namin 4 lng, ung nga ang problema..


http://www.friendster.com/photos/105006711/1/756494727

wala pa po yan multiplexer na gamit..

salamat po!
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Offline xy

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Re: HELP! Alarm for Digital Clock
« Reply #19 on: May 17, 2009, 10:45:38 AM »
mux nlang kmu kent jan...
ang sa selector kang mux gmit kamu toggle switch...
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Re: HELP! Alarm for Digital Clock
« Reply #19 on: May 17, 2009, 10:45:38 AM »
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