Alarm clock with up/down counter

Projects General Guidance
1

Hi everyone,
I would like to build an alarm clock with an up/down timer and before re-inventing the whell, I would like to know if there's an existing sketch that I could use as a starting point.
My hardware is: Arduino UNO, KS0108 GLCD (128x64) and a DS1307 RTC.
Also, I would like to display the time with large fonts. (4 digits that will fill the display)
I'm reletively new at Arduino and I'm willing to learn but I realise that the learning curve will be long before I can get this clock working.

Thanks for your help and suggestions

Robert

2
3

Thanks for your suggestion.
I have done something like that already to test my harware.
An LCD is just not big enough. That is why I would like to use a GLCD with a large font.

4

I see, then build the monochron:
http://www.ladyada.net/make/monochron/index.html
Lots of mods available.

5

The problem with the Monochron is that you need an AVR programmer to modify the code.
I would prefer to stay in the Arduino environment.
Also, they apparently use a different bootloader.

Unless there is something that I don't understand.

6

I did not take a look at the code, but as long as the compiled sketch is under 30KB, you should be able to upload it to any ATmega328 with (any) bootloader, and that includes Arduino UNO.
Otherwise, if the code is bigger than 30KB (but smaller than 32KB, obviously), you can always cut something and make it fit, I am sure.
And you are willing to learn, aren't you?

7

Thanks for the info, I will give it a try.