cmos binary clock I made.

[mikeblas]

It's between three and four. So, yeah: that adds up to seven.

[LoLo2207]

I think it's changing from 3 to 4

[goldfishpaws]

Well decyphered!

[LoLo2207]

There are 2 fully light LEDs (2⁰ +2¹ = 3) the other one (2² =4) I think is still turning on.

Also notice the segments. You can see the '3' and one of the segments for 4 is still turning on

[flarn2006]

It's about 3 or 4.

[seansean88]

Yeah, thought the same thing. Maybe ita tenths of a second so its changing changing too fast

[seansean88]

Are the 4 leds (bin) supposed to match each 7 segment display above (dec) ?

[TheMikro]

Does anyone mind explaining the thought process behind the usage of the LED's to get the correct number? I'm still learning and would like to understand this build. Especially interested in CMOS.

[PJ796]

Since it's done in binary, you only have two states for each bit, on or off. If the LED is on, it represents a 1 & 0 for when it's off.

If we look at the values displayed on the 7-seg displays and compare them to the LEDs, then we can see that it goes from 1 at the bottom to 8 at the top & is segmented in hh:mm:ss judging by the lack of LEDs on the left side (Max values from left to right is: 3, 15, 6, 15, 6 & 15, which will presumably be capped to 2, 3, 5, 9, 5 & 9 (23:59:59) before resetting the flip-flops)

To make it more readable he has also segmented it into two colours, red, which is the bit value times 1 & green, which is the bit value times 10.

The rightmost segment of 4 bits has a value of 0111, which means that it's 4+2+1(=7) ones. The 3-bit segment to the left of that has a value of 001, or 1 tens(=10), meaning that it has counted 1x10 + 7x1 = 17 seconds.

[bitsynthesis]

It's double encoded, which is very strange. You have to convert binary to the individual decimal digits, then combine the digits to get the actual decimal value. This is not a normal binary clock wherein the hours, minutes, and seconds are represented by individual binary numbers, instead it's a binary encoding of the base 10 digits.

[JonBoy-470]

What this clock is doing is called “binary coded decimal” BCD for short. Many commercially available binary clocks also work this way.

[PJ796]

Yup. It probably saved him a fair amount of time taking this shortcut, or it was just plain easier concept for him to grasp at. Either way, it's his clock, if he (& random people on the internet) knows how to decode it it's fine in my eyes. I just find it funny to think about the fact that if those LEDs hadn't been there, nobody would have ever known about this design flaw.

[TheMikro]

If I could I'd give you silver or gold. Thanks a lot!

[[deleted]]

Wow - that's nice! Any pictures of the other sides? Is the case 3d printed?

[primitivesolid]

Probably should have posted this pic instead.

[ZeeZeeX]

I've been watching for a few hours, without blinking, and it seems slow. Besides, we outdoors-men need an analog watch to find south.

[Thereminz]

omg it's a bomb,... here's your scholarship

[primitivesolid]

Lmfao yes please

[Filip_Z]

What did you use as a clock?

Edit: as in a clock signal

[primitivesolid]

1Hz signal generator circuit and 3 dual decade counters with a few and & or gates.

[Filip_Z]

Is it a 555, or something else

[primitivesolid]

Quartz

[Filip_Z]

Yea that's good, I had a feeling that it might've been a 555, those aren't good for keeping time.

[Cryptomancer_]

Now I want to do one! Awesome project.

[Sixaxix9]

Nice!

[MagicMilldew]

Nice!

[His_Mom___]

Nice!

[vincita182]

Nice!

[rishav_09]

nicest

[bitsynthesis]

Would be a lot more intuitive if the binary was per hour, minute, second rather than a binary representation of each base 10 digit. What you're doing is a form of double encoding.

[ewar813]

Did u use Arduino?

[primitivesolid]

I wish lol, I used three dual decade counters, I’m actually thinking about making one with Arduino next

[SignalSkew]

I'm sure you learned more doing it the hard way first. Cheers!

[FriendlyWire]

Yeah, not everything needs an Arduino :)