the fire and burglar alarm

[ahsanali]

To make a fire alarm using microcontroller 89C51such that
the system should also sense the environmental temp,
and the user gives it a temprature value as a barrier ,
and when the environmental temp exceedes that barrier
the alarm should be switched on.The useof microcontroller 89C51
is must. bcz it is our subject of whom this project is.
LM35, microcontroller, should be used here.
THE PROBLEM for me is that its my first time to do this
type of project. so i want the circuit diagram and the
list of equipment and the way how they work in this project.
i shall be very thankful to u all helping me
u can also contact me on ahsanali@yahoo.com
regards,
AhsanAli

 

[neelandan]

You might try a microcontroller with built in ADC. A PIC like the PIC16F876 or something like that.

You will have to do a bit of configuring the ADC to do what you want, but the rest of it is just straightforward programming.

 

[byom]

To make a fire alarm using microcontroller such that
the system should also sense the environmental temp,
and the user gives it a temprature value as a barrier ,
and when the environmental temp exceedes that barrier
the alarm should be switched on.The useof microcontroller
is must. bcz it is our subject of whom this project is.
LM35, microcontroller, should be used here.
THE PROBLEM for me is that its my first time to do this
type of project. so i want the circuit diagram and the
list of equipment and the way how they work in this project.
i shall be very thankful to u all helping me
u can also contact me on ahsanali@yahoo.com
regards,
AhsanAli

if at all you need a microcontroller, then i think u can use a microprocessor kit like MPS 85 generally used for labs. with the help of the parallel transmission controller INTEL 8255 , write a ALP to control input and out put . ofcourse u may have to use a ADC for this purpose. i had used this process to design a temperature controller.

 

[jojokatada]

i guess much better use a microcontroller. all the hardware needed are already there ram, rom flash, it will minimize the circuit and easy to make change in the software since the microntroller can be reprogram.
while microprocessor i need more external hardware
difficult to find in the market 8255 chip