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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.

Code 1+ 5+ 50+ 200+* 300+*
incl VAT

*includes bulk buy discount, discount applied at checkout


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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