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Binary Clock

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eblc1388

Active Member
The port pins can only switch to HIGH or LOW, so I amended the circuit.

If you want a dim LED, you can consider adding high value resistors(only one shown in drawing) directly bypassing the PIC control resulted in dimly lit LEDs . See circuit.
 

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Joel Rainville

New Member
For now my hardwork is limited to the above circuit ;) But I promise to post pictures to this thread when I get some soldering done. In fact, I'd like to document the whole process on my website, from my first post here, to a complete schematic, step-by-step picture walkthrough, down to the actual woodworking involved in the enclosure fabrication :D We'll see if I manage to get it done... ;)
 

oliverb

Member
I've had an idea using Bi Colour LEDs. See pic normally the Gn Led would light showing 0. When S6&7 close the Red led would light and Gn would go OFF due to the higher forward voltage of the Gn LED showing 1.

I pesume you could reverse this by swapping LED connections and adding series diodes on the Red Led.

Brett.
 

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Joel Rainville

New Member
oliverb said:
I've had an idea using Bi Colour LEDs. See pic normally the Gn Led would light showing 0. When S6&7 close the Red led would light and Gn would go OFF due to the higher forward voltage of the Gn LED showing 1.

I pesume you could reverse this by swapping LED connections and adding series diodes on the Red Led.

Brett.
Nice. I'm not sure which idea I prefer, dim & bright or bi-color. I'm affraid 2 colors would be hard to read?... unless the 0 (green) is made a little dimmer and the 1 (red) brighter?
 

eblc1388

Active Member
oliverb said:
I've had an idea using Bi Colour LEDs. See pic normally the Gn Led would light showing 0. When S6&7 close the Red led would light and Gn would go OFF due to the higher forward voltage of the Gn LED showing
Interesting idea of using the slightly lower forward voltage of red LED to turn off green LED.

Only one problem though, those bi-color LED never exists. :shock:

You have made separate connection to all four legs of the bi-color LED but the actual one I have seen all have the common cathode connected internally(3 legs) or connected back-to-back(2-legs).
 

oliverb

Member
Pendulem Controlled Binary Clock

Here a pic of a Pendulem controlled Binary clock I built around 20 years ago. This clock had a half second pendulem that operated a change over contact once a second.

The clock is around 2ft tall and is wall mounted.
The pendulem was energised by a hip togle switch every 14 seconds.

The binary clock drive was connected to the change over contact by a noiseless switch.
Brett.
 

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oliverb

Member
That's correct. I included the extra LEDs to keep the display balanced.

I did a similar thing on my binary clock on page 3 of this post. The last LED on the hours display is never used.
 
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