microprocessor

[mega1]

I kindly need assistance in connecting a motion detector + gas detector + smoke detector to a microprocessor that will call my phone in case any of the sensors beep.

Thanks for the help.

 

[melone]

Sounds like a cool project. Don't things like this already exist on the market?

 

[IRstuff]

Ademco, and a number of other companies make a control panel for around ~$100 + programming panel about the same amount + sensors.



TTFN

 

[mega1]

I realy needed the microprocessor hook up to make the ssystem work.

Thanks

 

[IRstuff]

If your time is valued at $20/hr, my estimate is that it will cost you about $3000 to duplicate what's already in existence.

TTFN

 

[zimbali]

sometimes you wanna do something yourself and just for fun! I appretiate that.

If you've got the sensors and know the outputs, connect them to comparators. Each comparator has a reference voltage that guarantee a "ONE" output if a sensor feels something. Then "OR" the three signal and give it to a port of a microprocessor that has been initialized as an Input. Your program inside the micro is a 3-line loop that checks if the pin is "1" or not. If not goes back to the loop, if it is "1" it calls a subroutine that calls your phone. There are ready subroutines out there to call a telephone number using a computer or microprocessor system.


Cheers


You can live in your car, but you can't drive your House!

 

[IRstuff]

Most alarm systems use an in-between value resistor such as 2K. NC switches are run in series, while NO switches are run in parallel. The circuit continually measures the circuit resistance to check for circuit integrity

This type of arrangement is a little more robust against certain types of faults as well as providing for a certain amount of tamper resistance.

TTFN