1 Hz square wave generator

rh495 · 2010-10-08T09:46:19+00:00

Hi all, I am making a Digital Clock. For this purpose, I need a 1 Hz signal to insert as a Clock for 'Seconds' portion of my circuit. How to create 1 Hz ? I tried 555 timer, but practically I am not getting exact 1Hz. Now I decide to make Crystal Oscillator. I have a 32.768 kHz Quartz Crystal. I have searched Internet for making the circuit. But I cannot simulate anyone of them in 'Proteus ISIS'. I want to have this 32.768kHz and then divide it using Counter(s) to have exact 1Hz signal. Now what to do? Anyone please help me with making the Crystal Oscillator Circuit and needed formulae. Thanks.

1 Hz square wave generator

rh495

Member

Updated: Oct 25, 2024

Views: 1.6K

Hi all,
I am making a Digital Clock. For this purpose, I need a 1 Hz signal to insert as a Clock for 'Seconds' portion of my circuit. How to create 1 Hz ? I tried 555 timer, but practically I am not getting exact 1Hz. Now I decide to make Crystal Oscillator. I have a 32.768 kHz Quartz Crystal. I have searched Internet for making the circuit. But I cannot simulate anyone of them in 'Proteus ISIS'. I want to have this 32.768kHz and then divide it using Counter(s) to have exact 1Hz signal. Now what to do? Anyone please help me with making the Crystal Oscillator Circuit and needed formulae.
Thanks.

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shahrul

Member • Oct 19, 2010

To make digital clock, you can use RTC. or if you want generate 1Hz signal, you can do with Timer Interrupt in microcontroller (eg PIC).

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d_vipul

Member • Oct 20, 2010

Hey RH,

shahrul is right.......

Go for it.............

Regards,
VIPUL

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Happy Chap

Member • Oct 20, 2010

RH495, this link may be helpful, shows a 4060 14 stage binary counter, which will get your 32.768khz xtal down to 2khz, and even has a diagram showing how to connect a crystal osc to it. Once you are at that site, there a many data sheets for many different ICs, and you shouldn't have to much trouble finding a couple of decade counters and whatever else you need to get down to 1 hz.

Good luck.

<a href="https://www.futurlec.com/4000Series/CD4020.shtml" target="_blank" rel="nofollow noopener noreferrer">CD4020 Datasheet</a>

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Munguti

Member • Oct 22, 2010

I agree with shahrul plus that is the easiest option.

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shahrul

Member • Oct 26, 2010

You can see free coding here, #-Link-Snipped-#.

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Munguti

Member • Oct 26, 2010

shahrul
You can see free coding here, #-Link-Snipped-#.
This is not an english web page, how do we translate it

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shahrul

Member • Oct 26, 2010

Munguti
This is not an english web page, how do we translate it
You just view schematic, video and download free source code. Source code is english.
Or translated from malay #-Link-Snipped-#.

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Durgaprasadbh

Member • Jan 28, 2013

Hey RH,
Though you can generate a 1Hz frequency signal using the 32KHz crystal it will be accurate enough. This is due to the addition of propagation delays at each divider. If you don't have any critical need of accuracy then you can go for it.

-Dp

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