Sought: Digital alarm clock plans

[WhereMyTechIs]

This very first message I send asks for a way to construct a digital alarm clock with these four displays, all of which should use red LEDs. They are listed in descending order.
1. A 24-hour display of Greenwich Mean ("Zulu") Time in HH:mm:ss format.
2. A 12-hour display of Zulu Time in h:mm:ss:tt format.
3. A 24-hour display of local time in HH:mm:ss format, with on/off DST indicator.
4. A 12-hour diisplay of local time in h:mm:ss:tt format, with on/off DST indicator.
The 24-hour displays should be followed by HRS in 16-segment LED displays; the 12-hour displays, by either AM or PM using the same. It should be possible to set the clock by moving the hours, the minutes, and/or the seconds either forward or in reverse, at either fast speed or slow speed.

The clock will be an alarm clock, and its alarm should sound for up to and including five minutes, so it should have a speaker-volume control. The sound that I mean to use for the alarm will be based on whatever plans anyone else in this forum supplies--but it will NOT be a radio-based sound. It should also have a "snooze" control that can silence the alarm for up to and including two minutes.

As for the electrical power the clock will neeed to function, the source of that should be either a battery of rechargable AA power cells or a disconnectable AC adaptor, which adaptor should also be able to recharge the power cells.

Any assistance that can be offered along these lines will be gratefully accepted and muchly appreciated, even and especially if that assistance means moving this message to a "specialized" sub-forum.

--Paul Green
MAILTO:WhereMyMailIs@juno.com

 

[crutschow]

If you are looking for a complete set of plans, that's unlikely.

Seems like the best way to build this would be with a micro-controller driving four (multiplexed)display drivers for the LED displays. The µC can perform all the timing and control functions as well as controlling the displays. It can be controlled from a keypad or custom set of keys. This all will require a reasonable amount of custom software, of course.

The µC can also generate the alarm since most have a way to generate various sounds. This could drive a simple IC audio amp and speaker. A pot at the amp input can control the volume.

The power supply can be a commercial battery charger IC designed for the particularly batteries you are using.

 

[MikeMl]

Looks like a job for RB's shift LCD

 

[Ericfixit]

This very first message I send asks for a way to construct a digital alarm clock with these four displays, all of which should use red LEDs. They are listed in descending order.
1. A 24-hour display of Greenwich Mean ("Zulu") Time in HH:mm:ss format.
2. A 12-hour display of Zulu Time in h:mm:ss:tt format.
3. A 24-hour display of local time in HH:mm:ss format, with on/off DST indicator.
4. A 12-hour diisplay of local time in h:mm:ss:tt format, with on/off DST indicator.
The 24-hour displays should be followed by HRS in 16-segment LED displays; the 12-hour displays, by either AM or PM using the same. It should be possible to set the clock by moving the hours, the minutes, and/or the seconds either forward or in reverse, at either fast speed or slow speed.

The clock will be an alarm clock, and its alarm should sound for up to and including five minutes, so it should have a speaker-volume control. The sound that I mean to use for the alarm will be based on whatever plans anyone else in this forum supplies--but it will NOT be a radio-based sound. It should also have a "snooze" control that can silence the alarm for up to and including two minutes.

As for the electrical power the clock will neeed to function, the source of that should be either a battery of rechargable AA power cells or a disconnectable AC adaptor, which adaptor should also be able to recharge the power cells.

Any assistance that can be offered along these lines will be gratefully accepted and muchly appreciated, even and especially if that assistance means moving this message to a "specialized" sub-forum.

--Paul Green
MAILTO:WhereMyMailIs@juno.com

I was looking for the same thing.
With the purchase of a small IC it's a go ( I just got them in the mail 8 days ago)
Good Luck
**broken link removed**