Instructables

Arduino Digital Clock (With Charlieplexing LEDs, 7 segment Displays)

Featured
           This is my second instructable. I just had a mood of making a digital watch. But wanted to make it a learning process. I already had a sanguino i could have easily used that Atmega644 chip. it would have been more than enough.  But i wanted to try burning a Arduino bootloader and see if i could make it work. Well i did. I used a Atmega168 for this project
           I used 4 seven segment displays to display time in 24hr format. Here ii experimented with common anode and common cathode. Now i wanted to use other chips too and not just the Arduino which would have been the easier option. The chips i experimented with are 74LS47, 74HC154, 74HC595 ,4511 and  74HC139. The final compatible combination was common cathode with 4511 and 74HC139.
           I used a RTC chip DS1307  to feed the time to the Arduino. I initially wanted to use millis() function in Arduino but it is not that accurate. Using RTC not only saved long coding but also has an added advantage of keeping the time in case the external supply is cutoff. It uses a 3v battery to do this.
          Now I have used LEDs to point the time as minute and hour hands would do in an anolog clock. 60 Bi-coloured LEDs total which work on Charlieplexing.
          Well if you are interested onwards you go.


 
Remove these adsRemove these ads by Signing Up
ekrammer1 year ago
Arduino boards can be purchased pre-assembled or do-it-yourself kits. Hardware design information is available for those who would like to assemble an Arduino by hand. I guess these concept displays on this article are the ideas of some of their consumers which they able to develop uniquely and have that original taste…
MagnumClock.com
Hi, my picture is actually a girl that I crave and I like to leave superficial, obvious and general information. Maybe I think I need to get my post count up to become part of this?
I also like to leave a link to some dubious, amateurish website with self-written testimonials, selling related junk steeply overpriced.
The mysterious thing about me: that link is probably just googled randomly, since it's no referral link.

Oh wait, now I'm making people click the link...
yuva1431 year ago
thank u :)... i wil try to make face-plate also...can u post ur mail id
kaustubhv (author)  yuva1431 year ago
kaustubhv121@yahoo.co.in
yuva1431 year ago
hi,
I have designed similar arduino Digital clock.
IMAG0169.jpg
kaustubhv (author)  yuva1431 year ago
Gud job bro!! Now design an nice face-plate for it.
yuva1431 year ago
hi
there is no code in clock_v2.pde. can u share it
kaustubhv (author)  yuva1431 year ago
Thanks for pointing it out. I have replaced the Arduino_code.rar file.
yuva1431 year ago
hi, ur project s really suprb...good work .....can u post the PCB design in eagle software or else in pdf format
kaustubhv (author)  yuva1431 year ago
Thanks. But i m sorry to say that i don't have experience in eagle. I created the PCB in Expresspcb and used the toner transfer method. it was quick this way. The concentric tracks were handmade.
I wanted to practice using eagle. I will try and make this circuit in eagle. We both get what we want this way. But this will take considerable time as I am working on something else right now. As soon i complete it in eagle i will post it.
phinch1 year ago
This is amazing craftsmanship. I love your charlieplexing traces. Well done. I'm building an arduino based clock and I hope mine comes out as nice as yours.
kaustubhv (author)  phinch1 year ago
Thank you. Those traces took a lot of patience. They whole project turned out better than i expected. I will await your Arduino clock instructable..
Can you share your RTClib.h? I can't compile PDE.
kaustubhv (author)  UncleSam9761 year ago
I have used RTC module as it is from the site I have linked in step 5. You can download the RTC.lib from the Arduino library tab on the left on that site. Follow the steps mentioned there. They also have a sub link for tutorials on installing Arduino libraries. It is explained beautifully there.
Thank you for commenting.
I would love to see your final product. If possible post a pic in the comments section.
looop451 year ago
I like the avatar element symbols.
kaustubhv (author)  looop451 year ago
I would have like to make more justice to them. They are not that well made. This was my first time glass painting.
Love the LEDs and how colorful it is. Very nice! :D
kaustubhv (author)  jessyratfink1 year ago
Thank you. :)