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Project Qns! HELP needed!

dex

Oct 24, 2006
1
Joined
Oct 24, 2006
Messages
1
hi to all. . . first post here. . . current third yr poly doing FYP and encountered some problem. . . Here's a brief overview of the project
name:fire alarm panel
budget: as low as possible as its an alarm for the residents
function: -detect smoke and fire through smoke and heat detector
-gives alarm when either smoke or heat is detected
-gives alarm when the detector are nt closed properly/open circuit
panel: -on/off switch
-three leds(Green-power on,Yellow-open circuit,Red-fire detected)
-silencer(to silence the alarm)

problem faced:
1) circuit runs on 24v,thus 2x12v rechargeable battery is needed.3 pin plug and a turn-down transformer circuit to bring down voltage and convert it to dc. though i know a transformer is needed to bring down voltage,full bridge rectifer to rectify,electro cap to smoothen and voltage regulator to regulate voltage. But nt realli sure of bridge rectifier/individual diode to use. Ani simulation website on this will ne of great help if ani
2)And since the battery need to be charged,i m nt sure whether to turn down voltage to 14v or 26v to charge it individually or to charge it together. suggestion needed thxs
3) A comparator circuit to start and stop charging when voltage of battery reaches below 21v or above 24v.
4)Ani one noes of a circuit or component to detect zero current?
5) Last problem but this is additional stuff,we had wanted to build a circuit to send sms to a desinated no with a predefined msg. Sourced the internet and found similar project at "http://www.wrankl.de/SMST4PIC/SMST4PIC.html" but nt sure how to start as tat PIC assemly language is alien to us. Ani pros on this willing to help?

Lastly,thx all 4 taking time out to read my long problem and hope help arrives fast thxs lotz in advance
 

BobK

Jan 5, 2010
7,682
Joined
Jan 5, 2010
Messages
7,682
Looks like you have a lot of research to do. We’ll be happy to help when you have a question.

Bob
 
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