PIC 16F84 LED Clock

Written by: Alan Parekh at 5:37 am. Filed under Complex Hacks, Electronic Hacks

Ronald Dekker put together an LED clock using a PIC 16F84 microcontroller. Some people would wonder why a $5.00 clock from the store couldn’t be used. It could be, but where would the fun be in that?

“The 16F84 processor used here is a little bit out dated and no longer in production. I used it because of the simple fact that I had it lying around. The more modern 16F628 is pin compatible and will perform equally well. The 16F84 has too few I/Os to address all the anode and cathode drivers directly (Fig. 3). A 74HC563 8 bits latch was used to extend the number of outputs by another 8 bits at the expense of a latch enable signal taken from port A. The eight outputs from the latch, together with the lowest 4 bits of port B from the PIC drive address the cathode drivers. Since only one of the anode rows is switched on at any given moment, a HEF4028 1-of-10 decoder could be used to activate one of the six rows using only 3 bits (A0…A2). These bits are connected to the higher 4 bits of port B. To prevent unwanted illumination of LEDs during the multiplexing of data to the 74HC563, I/O bit A3 from port A is used to completely disable all the anode drivers. ”

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9 Responses to “PIC 16F84 LED Clock”

feki00 Says:
August 24th, 2007
silicon cementery
ryan Says:
August 24th, 2007
cool
Hugu Says:
September 3rd, 2007
Nice!
It’s possible get the circuit squematic, list of components and of course the program’s PIC?
i wanna do this project! it’s very nice stuff!
Alan Parekh Says:
September 4th, 2007
Click on the link in the article, looks like code and circuit are provided.
bynz Says:
November 19th, 2007
nice! can this be modified on 60hz ac mains? thanks!
hamid Says:
September 5th, 2008
hi
i need colok circuit,plz help me
tank you
uugii Says:
May 9th, 2009
hi. can you explain how to make this clock?
uugii Says:
May 9th, 2009
i need this clock circuit. what program it has? please answer me?
lotfi cherif Says:
June 4th, 2010
its a very great idea.. i need this circuit clock answer me..