Engineering Project Help - LDR security buzzer circuit

Replies

• 

  cooltwins

  The concept im having difficulty with is finding a way to add some sort of button password combination in replacement of the switch, so that when the owner of the safe was to open it they could deactivate the buzzer and then activate it again after use.

  neither am i an expert in this field but i have done a paper in the concept of burglar alarms and in that to enable a user to deactivate it a control box is used.most modern burglar alarms incorporate this facility into the circuit -- the control box.
  1) The control box is hooked up to one or more alarm circuits, but it also has its own power supply.
  2) It monitors the circuits and sounds the alarm when they are closed or opened (depending on the design). But once the alarm is triggered, the control box won't cut it off until somebody enters a security code at a connected keypad.
  3) For added security, the control box is usually positioned in an out-of-the-way spot, so the intruder can't find it and attempt to destroy
  
  but to even delay this trigger there are some control boxes which have the facility of an entry delay
  There is a short delay to give the homeowner time to enter a security code that turns the system off.
  If the security code is not entered, however, the control box will activate various alarms.
  
  hope it doesn't confuse you and is of some help to you
• 

  Tkot

  linksy

  The concept im having difficulty with is finding a way to add some sort of button password combination in replacement of the switch, so that when the owner of the safe was to open it they could deactivate the buzzer and then activate it again after use.
  
  
  im really not an expert either but can help with some links. there are #-Link-Snipped-#, Electronic Projects, Embedded News and Online Community - Electronics-Lab, Projects, Thesis, Dissertation, Project Reports. you can get some informations on keypad combination locks.😁

• 

  reachrkata

  Perhaps this thread will help you with a simple password entry keyboard -
  
  #-Link-Snipped-#
  
  - Karthik
  😁