links for building alarm clock

[Anonymous]

just checkout these links

 

for digital clock-

http://www.engineersgarage.com/microcontroller/8051projects/LCD-digital-alarm-clock-AT89C51;

http://www.engineersgarage.com/microcontroller/8051projects/digital-clock-AT89C51

 

for different alarm sounds-

http://www.engineersgarage.com/microcontroller/8051projects/generate-sound-AT89C51

 

and for count down you can use the counter mode of timer of 8051