Different LCD for "Digital Clock with Alarm Using DS1307"

Dear Ajay Sir,
I have made "Digital Clock with Alarm Using DS1307" and it worked quite well.
But now I am trying to make the same clock with a bigger display and I am looking for a project where I can sync 5 such displays with single RTC (Something like 5 time zone clock).
Please guide me how to replace 2X16 LCD display with some other displays which can be used commercially.

I want to Replace 2X16 Display with some standard display which can be mounted on wall and which should be visible from 5 to 10 Meters.

Someone please help me with this.

@

I want to Replace 2X16 Display with some standard display which can be mounted on wall and which should be visible from 5 to 10 Meters.

how much big what is the size of LCD
u may need to generate ur own fonts to generate a bold digits that can be seen from far away
see a lcd tutorial
and Ajay generate some fonts in has AT89C4051 RTC version
u can get help from there

OK Sir.

One more doubt is there. In the circuit diag. of "Digital Clock with Alarm Using DS1307", can i connect the same RTC with 5 different Microcontrollers.

As per the circuit diagram, the 5th & 6th Pin of the RTC is connected to the 1st & 2nd Pin of the Microcontroller. Can I take 5 different microcontrollers and connect the 1st & 2nd Pin of every Microcontroller with the 5th & 6th Pin of a single RTC (Keeping the other connections connections as it is) Hence making 5 different clocks with a single source of RTC.

In short, can I sync. more than one microcontroller with single RTC in "Digital Clock with Alarm Using DS1307"

In short, can I sync. more than one microcontroller with single RTC in "Digital Clock with Alarm Using DS1307"

kanth_sourabh

Yes you can do that.
Just make sure that all the micros allow their pins to float when not talking to the DS1307.
What kind of system are you building ?.

Yes you can connect 1 RTC to more than 1 MCU.
But in this case 1 MCU should be Master and others all should be Slave.
Check data sheet of 4052 IC.

@ ExperimenterUK & kirangowle, Thanx for your valuable support.

My target it to make 5 Time zone clock keeping the source same for every clock. So i thought that I can do it by making some alteration in the circuit diag. of "Digital Clock with Alarm Using DS1307".
But as per the suggestions given by you all, it seems a little difficult.

1) Can you please share a circuit diagram by altering the arrangements of the existing circuit diagram of "Digital Clock with Alarm Using DS1307"
2) Can I use the same HEX code for every MC present in the Circuit.

If all the micros try to read the RTC you will get clashes.
I suggest that one micro reads from the RTC, and updates the others through its serial port.
IE.
TX to the other four RX pins

The micros can use their internal timers to tracks hours,minutes,seconds
and get days months etc from the main micro and the RTC.

In this case the four "slave" micros use the same code, with suitable time shifts, and the main
micros has slightly more complex code.