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Alarm Project Kit

Exclusive to Kitronik
Teaching Notes
Key Stage 3/4
Protect your room against intruders! Mount the micro switch on to any movable object to trigger the alarm. The alarm is deactivated by a separate slide switch.

Availability: In Stock.

Code1+ 5+ 50+
(£6.18 incl VAT)
(£4.50 incl VAT)
(£4.08 incl VAT)

This kit can be used to make a shed or room alarm when mounted on the top of a door, drawers or any other object with a moveable opening. It can also be used by replacing the micro switch with a magnetic door contact.

A micro switch acts as a trigger mechanism and is armed / disarmed by a seperate sliding switch. The door's movement is detected by a micro switch mounted onto a door or object with a lid. A timer provides an entry delay during which the system can be disarmed by the slide switch, whilst a separate timer silences the alarm after two minutes. Both of these timers are implemented via a 556 dual timer IC.

The alarm can be further enhanced by using a simple key switch for arming / disarming or by replacing the micro switch with a magnetic door contact switch to activate it. The board, battery pack & buzzer can be placed into a box designed by the student.



Possible applications include:

  • Adding an alarm to a cookie/biscuit tin.
  • Adding an entry alarm to a door.


  • PCB Length: 51mm.
  • PCB Width: 41.5mm.



This kit is supplied in a simple grip seal bag.

Note: This is an educational kit and should not be used to secure anything of value.

Free samples:

Teachers can order a sample of this kit (one per school) here. You will need to select the kit from a list of all the sample kits; the stock code for this kit is 2101.
Note: this service is only offered to schools for evaluation purposes only.

Buy British:

 This kit is designed and manufactured in the UK by Kitronik.

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Posted by Mrs Brooks, Thursday, 13 October 2016 on product Alarm Project Kit
  • 0


    This kit sounds an alarm when the microswitch is moved. I'm not really sure what you have in mind. If you email with a little more information about what you want to do we mght be able to suggest something.

    Posted by Rob Haywood on Thursday, 13 October 2016
Posted by Peter, Friday, 18 December 2015 on product Alarm Project Kit
  • 0

    Unfortunately it wouldn’t be possible to build that circuit using this kit. Do to the way the circuit has been designed it wouldn’t be possible to have it were it can only be deactivated with a reed switch. We also don’t sell any kits that would do what you require.

    Posted by Michael Lockhart on Friday, 18 December 2015
Posted by Meerav Shah, Tuesday, 7 May 2013 on product Alarm Project Kit
  • 0
    A: It would take roughly between 10 and 20 minutes depending on how good you are at soldering. Maybe a bit longer if you have not soldered before.
    Posted by Aaron Sturman on Tuesday, 7 May 2013

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