LED Digital Watch without MicroController

[yvvijay007]

I've used a single 4060 with a 32.768khz crystal oscillator. Stepped down to 2Hz which was then given to a D flip flop to step down to 1hz. I'm using 4073 (3 input AND gates) to solve the problem of resetting the 4026s of the 10s minutes and the 10s seconds at 6. BUT... the problem is the output from the 4026 pins is 1.73V and minimum voltage required by the 4073 to detect a signal as high is 4.5V What should i do now?? leave all this and program a 8051 instead??

 

[Hero999]

It's not possible because the circuit will be physically too large to wear on one's wrist.

 

[Nigel Goodwin]

I've used a single 4060 with a 32.768khz crystal oscillator. Stepped down to 2Hz which was then given to a D flip flop to step down to 1hz. I'm using 4073 (3 input AND gates) to solve the problem of resetting the 4026s of the 10s minutes and the 10s seconds at 6. BUT... the problem is the output from the 4026 pins is 1.73V and minimum voltage required by the 4073 to detect a signal as high is 4.5V What should i do now?? leave all this and program a 8051 instead??

Well you might try using a less ancient device - 8051's are antiques.

 

[mbarazeen]

if you can post the sketch of the circuit we better can tell where the problem may be

 

[Hero999]

An LED display isn't suitable for a watch because it uses too much power, you need an LCD for a watch.

 

[Nigel Goodwin]

An LED display isn't suitable for a watch because it uses too much power, you need an LCD for a watch.

You're obviously far too young!

ALL digital watches used to use red LED's at one time.

 

[Hero999]

How long did they last for?

Surely you had to press a button to see the time, there's no way they display could've run continuously, especially given the old battery technology.

 

[Nigel Goodwin]

Surely you had to press a button to see the time.

Yes you did - like I said, you're far too young

 

[Hero999]

I've just watched the watch episode of the secret life of machines and yes, you're right.

It was very interesting, although I think it could've given a brief explanation of polarising filters and digital counters, although I know there's a limit to how much information they can cram in to one episode - you'd need a whole series to fully teach laypeople how a digital watch works.

 

[Nigel Goodwin]

I've just watched the watch episode of the secret life of machines and yes, you're right.

I used to have one!

 

[Mickster]

I used to have one!

Along with the LED watch, I also used to have a LED calculator....

Cutting-edge at the time.

 

[blueroomelectronics]

I had an ancient Timex LED watch once. I wanted the Sinclair kit.
Black Watch (wristwatch) - Wikipedia, the free encyclopedia

 

[yvvijay007]

Guys its not a wrist watch its a wall clock type of a thing

 

[blueroomelectronics]

Digital clock
Digital TTL Clock - Hacked Gadgets - DIY Tech Blog

 

[Brevor]

Well you might try using a less ancient device - 8051's are antiques.

8051's and PIC's came to market about the same time.

 

[Nigel Goodwin]

8051's and PIC's came to market about the same time.

PIC's are still seen as a modern device, and they keep well up on the cutting edge - 8051's are only used in India, Pakistan and similar countries.