My Digital Clocks ( Using 16F628 & 16F876 ) ( Images also )

pasanlaksiri · Mar 4, 2007

Digital Clocks

Source

Code:

http://www.hamradioindia.org/circuits/clock.php

Code:

http://www.josepino.com/pic_projects/index?led_clock.jpc

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Source

Code:

http://www.hamradioindia.org/circuits/clock.php

Code:

http://www.josepino.com/pic_projects/index?led_clock.jpc

Mike - K8LH · Mar 4, 2007

Bravo! Nice work. I enjoy other peoples Clock designs.

May I make an observation and suggestion? It appears you're using standard multiplexing with 4 pins directly driving the common cathode or common anode columns (displays) and 7 or 8 pins directly driving the display segments. This technique often results in low and uneven display brightness because the current supplied by the column driver pin is limited and must be distributed among the lighted segments. More lighted segments per column results in lower brightness. This problem can be fixed simply by adding column driver transistors to the design.

Regards, Mike

pasanlaksiri · Mar 4, 2007

Mike said:
Bravo! Nice work. I enjoy other peoples Clock designs.

May I make an observation and suggestion? It appears you're using standard multiplexing with 4 pins directly driving the common cathode or common anode columns (displays) and 7 or 8 pins directly driving the display segments. This technique often results in low and uneven display brightness because the current supplied by the column driver pin is limited and must be distributed among the lighted segments. More lighted segments per column results in lower brightness. This problem can be fixed simply by adding column driver transistors to the design.

Regards, Mike

Thanks bro. Those r not my designs. I just make those.

Mike - K8LH · Mar 4, 2007

That's cool. Again, nice construction job.

What type displays are you using? Common cathode or common anode? And what value segment current limiting resistors are you using?

pasanlaksiri · Mar 4, 2007

Mike said:
That's cool. Again, nice construction job.

What type displays are you using? Common cathode or common anode? And what value segment current limiting resistors are you using?

U can use both ( Common anode or cathode ) for that small cct. And no current limiting resisters.

I use common anode segments 4 that big cct. Current limiting resistor is 680hm:

Gayan Soyza · Mar 4, 2007

Thanks for the Links..I like that PIC16F876 clock it has all the features you need.Alarm,Date- sun, mon, tue, wed, thu, fri, sat,& also Dual time...etc....nice piece of design.

Gayan Soyza · Mar 4, 2007

Mike said:
Bravo! Nice work. I enjoy other peoples Clock designs.

May I make an observation and suggestion? It appears you're using standard multiplexing with 4 pins directly driving the common cathode or common anode columns (displays) and 7 or 8 pins directly driving the display segments. This technique often results in low and uneven display brightness because the current supplied by the column driver pin is limited and must be distributed among the lighted segments. More lighted segments per column results in lower brightness. This problem can be fixed simply by adding column driver transistors to the design.

Regards, Mike

Same thing happens to me when making my LED matrix circuit.So I added some Column divers as well as Row drivers....

Pommie · Mar 5, 2007

Gayan,

I like your avatar.

Mike.

Gayan Soyza · Mar 5, 2007

Pommie said:
Gayan,

I like your avatar.

Mike.

Thankx.....no need more posts to be a moderator.If you like even now you can be a moderator.

pasanlaksiri · Mar 5, 2007

Pommie said:
Gayan,

I like your avatar.

Mike.

eeeeek. What the hell is that. hm: :mu: :delta:

My Digital Clocks ( Using 16F628 & 16F876 ) ( Images also )

pasanlaksiri

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