Basic Level     Skills: Not specified    
Author
Author email
[email protected]
Author website
www.rickeyworld.info

Description



DS1307 is a hardware realtime clock, which works on I2C protocol. Better graphics using the same old fashioned alphanumeric LCD (type HD44780). Icons which shows the status for Alarm ON/OFF state, which gives a nice and cute look to the clock.

There are four switches connected to the uC, as shown in the figure. Function of the keys are same as clear from their names.

When the power supply is switched on it will give you the default date and time, but later you can change it to the desired value. After setting once, the backup battery will keep the clock ticking even after the power is not there.

A little about I2C:
There are basically four main conditions in I2C protocol.
1) Start Condition
2)Stop Condition
3)Data Validity
4)Acknowledgement

1)Start Condition:
when SCL is high and SDA H->L, will be taken as start condition for the communication.
2)Stop Condition:
when SCL is high and SDA L->H, will generate a stop condition.
3)Data Validity:
When SCL is high there should be no chande in SDA line only then the data is valid, the data change should be made only when SCL is low.
4)Acknowledgement:

After sending of one byte of data the reciever has to acknowledge the sender for the successful reception. for this the sender make the SDA line high and reciever pulls down the SDA low, which tells the sender that data has reached safely.

Now the source code written in assembly, basically implements the I2C protocol. the assembly source written for Keil download here clock.asm and the direct hex file for programming the controller from here clock.hex. The schematic for the Digital clock is available in PDF format can be downloaded from here clock.pdf.

Project code has been revised and updated. Bug fixes regarding corrupt display.

History:
First Upload date:
08/05/2006
  Filesize

  Downloads

92091

  Rating
 

Comments

DragonDad
21 May 2019: 14:57 PM
Hi. How to use Alarm in this project? Please describe it step by step
  
(Required; Min length 5)
(Required; will not be displayed)

Conversation

Tue May 28 2019, 07:14 PM
Ron Otsig
KBI does not work on P89LPC920 but it works on P89LPC925
Mon May 27 2019, 09:03 AM
BIJI MATHEW
Hello friends....
DragonDad
Tue May 21 2019, 03:02 PM
Hi. Who is online?
Tue May 14 2019, 12:38 AM
Jayson Contreras
Hello
Xkalebar
Sun Apr 28 2019, 09:06 AM
Please provide me the code for gsm based sms controlled notice board
ExperimenterUK
Sun Apr 14 2019, 10:52 PM
@hassan malik post your problem in the "General help Guidance and Discussion" forum
Sun Apr 14 2019, 05:06 PM
RAJESH MAPARi
please send me code to interface atmega32 with 24c1024 serial eeprom
Sun Apr 14 2019, 01:33 PM
hassan malik
hello sir i installed proteus 7.8 professional on window 7 ultimate and window 10 but there would be same errors onn both windows. the error is bad license key.please any one help me
Sun Apr 14 2019, 01:32 PM
hassan malik
hello sir i installed proteus 7.8 professional on window 7 ultimate and window 10 but there would be same errors onn both windows. the error is bad license key.
ExperimenterUK
Sat Apr 06 2019, 05:59 PM
@deshrar. Please post your question in 8051 forum

Downloads

Comments

Easwaran22
Thu Jun 13 2019, 10:16 AM
JenniferJJ
Thu Jun 13 2019, 05:12 AM
seyoonnet
Tue Jun 04 2019, 12:37 PM
Charbel
Sun Jun 02 2019, 03:30 PM
ronotsig
Mon May 27 2019, 03:00 AM
WilsonNig
Sun May 26 2019, 03:11 AM
DragonDad
Tue May 21 2019, 02:50 PM
dhiyamtech
Thu May 09 2019, 10:20 AM

Online

Guests: 43, Members: 0 ...

most ever online: 182184
(Members: , Guests: 182184) on 06 Aug 2010: 05:37 AM

Members: 38072
Newest member: Easwaran22
Forum Activity
JenniferJJ Avatar
Posted By JenniferJJ
Thu Jun 13 2019, 05:17 AM
Hi,Hello Members,I am the newbie member, I like ve...
ExperimenterUK Avatar
Posted By ExperimenterUK
Thu May 30 2019, 08:32 PM
It occurs to me that although the P89LPC921 and P8...
ExperimenterUK Avatar
Posted By ExperimenterUK
Wed May 29 2019, 09:05 PM
I would suggest a fresh approach.The Keil compile...
ronotsig Avatar
Posted By ronotsig
Wed May 29 2019, 03:13 PM
Since the code works for the P89LPC925, it is appa...
ExperimenterUK Avatar
Posted By ExperimenterUK
Mon May 27 2019, 06:23 PM
I can't see any reason that those registers would ...
ronotsig Avatar
Posted By ronotsig
Mon May 27 2019, 03:06 AM
I am trying to using P89LPC921 or P89LPC922 in a p...
Ansh12 Avatar
Posted By Ansh12
Sun Apr 28 2019, 02:15 PM
I made a minor change, it works in Proteus.Try the...
ExperimenterUK Avatar
Posted By ExperimenterUK
Thu Apr 25 2019, 08:20 PM
I made a minor change, it works in Proteus.Try the...
gigyani Avatar
Posted By gigyani
Thu Apr 25 2019, 01:17 AM
when i add cufirst.hex its not working.after 2-3 s...
ExperimenterUK Avatar
Posted By ExperimenterUK
Wed Apr 24 2019, 12:29 AM
http://www.8051projects.net/download-d205-electron...