Electronics Circuit - What components can I add to a simple pressure pad alarm system ?

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dogguy

New member
It's for GCSE and I've built a simple pressure pad alarm but what can I add to it ? I've already got an oscillator, logic gates, some memory, a high pitched buzzer and push switches for inputs ( of course, 1 to act as the pressure pad and the other as the reset button for the owner of the house to press to reset the alarm).


Or rather, how can I incorporate a 7-segment screen into the circuit ? Or possibly an additional LED to light alongside the buzzer ?

Any ideas are kindly welcomed,
Dogguy.
 
One thing that distinguishes the real alarms from amateur ones is supervision. If the connecting wires are cut or shorted in real alarms the alarm will put out a trouble signal because it knows that the current level is not what it should be.

They also tend to have alarm silence circuits. If an alarm occurs a buzzer rings and a lamp lights. If you press a "silence" switch the buzzer goes off and the lamp blinks till a second button is pushed which Resets it.

THose are simple things to do with logic gates.

As far as 7 segment screens look up the drivers for them. Typically anytime you want to put numbers on that you need to use 7 outputs and store a table showing which segments are on and off for each number. Then you have to chip select one character and turn on all its "on" segments. Then go onto another character and do the same. That would let you indicate which switch has been tripped by the alarm.
 
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