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Help me design an alarm system

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ieda

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alarm system

hi! can someone help me....
i try to make the alarm circuit.... this is how it work: i want to set certain number for exampe 80 (display using LCD @ 7segment display), so when my system exceed 80, the alarm will activate...

i still not decide whether i want to use speaker or just the LED as the alarm output...

can someone help me.....
 

alarm system

use one 8 bit controller say 8051. the timer can be uesd for the time count. the count can be set permanently in the program or can be changed by a keypad/ dip switch if required. u can use led/ buzzer/speaker or all of them as outputs.. thats your choice..
 

Re: alarm system

as joby said use 8051 controller, use timer to generate the required delay, use matrix keypad to change the time and display it either on LCD or 7-segment display for which you will have to use multiplexing techniques

here are links that will help you with the code and interfacing for all the features that u require(lcd/7 seg interfacing, matrix keyoad interfacing and using timer):
https://www.dnatechindia.com/index.php/Code-Library/
https://www.dnatechindia.com/index.php/Tutorials/
 

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