Binary clock (to be finished 4 real)!

[Robot builder 101]

This is a project that I am ACTUALLY! going to start and finish. I found a thread already, and it looks like I can substitute the timing module with a 555 at 1 hz. The stuff used for the 1hz (actually 1.000000000000001 hz) is 10k resistor, 100k resistor, and a 10uf cap. It looks kind of easy to connect, but I may need some help.

https://www.electro-tech-online.com/threads/binary-clock.98/?highlight=binary+clock

sorry for the long I-net (did apple use this one already? inet?) adress.

 

[Nigel Goodwin]

This is a project that I am ACTUALLY! going to start and finish. I found a thread already, and it looks like I can substitute the timing module with a 555 at 1 hz. The stuff used for the 1hz (actually 1.000000000000001 hz) is 10k resistor, 100k resistor, and a 10uf cap. It looks kind of easy to connect, but I may need some help.

Bear in mind a 555 based clock will keep absolutely pathetic time!.

 

[1000]

If you use a advanced CMOS timer, like the 7555 (It is a cmos and low voltage right?) and good filter caps, you may be able to pull it off.

 

[Nigel Goodwin]

If you use a advanced CMOS timer, like the 7555 (It is a cmos and low voltage right?) and good filter caps, you may be able to pull it off.

Still be utterly crap!

Use a 32KHz crystal (watch crystal) and a divider!.

 

[Mike - K8LH]

Here's one I'm planning on doing sometime soon (but 5 volts and probably a 16F628A)...

**broken link removed**

 

[Robot builder 101]

I am going to order the parts that i need. The only question I have is: can I substitute CMOS (HC series) for TTL (LS)? The LS series has low output, but just to be safe i want to give it morepower.

 

[Krumlink]

If you can find the parts as cmos, you can use it! I read that you like jameco, and jameco doesnt supply the 74LS90/93/86/279 as HC. Good luck

 

[Hero999]

This is how you can achieve a stable 1Hz clock using only one IC and no programmable components.

 

[Krumlink]

Would a 20mhz crystal work or would I have to use the watch crystal. I am builidng one too and I just ordered the parts.

 

[Nigel Goodwin]

Would a 20mhz crystal work or would I have to use the watch crystal. I am builidng one too and I just ordered the parts.

A 20MHz crystal doesn't divide down nicely to 1Hz, the 4.xMHz one above does, and so do the (so called) 32KHz watch crystals - and these are also better time keepers than the higher ones, as they are specifically intended for clock use.

 

[picasm]

A way to get an accurate 1 second pulse could be to dismantle a cheap analogue wall clock clock, they usually have a very small pcb that outputs the required pulse.
Here is an example:
http://www.josepino.com/circuits/index?one_second_timebase.jpc

 

[Nigel Goodwin]

A way to get an accurate 1 second pulse could be to dismantle a cheap analogue wall clock clock, they usually have a very small pcb that outputs the required pulse.
Here is an example:
http://www.josepino.com/circuits/index?one_second_timebase.jpc

Using that very same 32KHz crystal I keep mentioning!

 

[mcs51mc]

Skip all the Xtals, IC's, caps and resistors and use

RF coded atomic clock signals

DCF77 the one I always use with whatever readout... ...


https://en.wikipedia.org/wiki/Atomic_clock

There are a number of longwave radio transmitters around the world - in particular DCF77 (Germany), HPG (Switzerland), JJY (Japan), NPL or MSF (United Kingdom), TDF (France), WWVB (United States).

 

[Hero999]

Wow Moore's law even applies to atomic clocks.

**broken link removed**