Introduction: Door Alarm

Picture of Door Alarm

This is a great and easy project to do for starters and experts

You will need a -screw driver
-NC or NO reed switch
-9 volt battery
-9 volt battery clip
-3 jumper wires
-active buzzer

Step 1: Step 1

Picture of Step 1

Put the active buzzer on the breadboard

Step 2: Step 2

Picture of Step 2

Connect the positive pin of the buzzer to com on the reed switch

Step 3: Step 3

Picture of Step 3

Connect the negative pin in the buzzer to the negative rail on the breadboard.

Step 4: Step 5

Picture of Step 5

Connect the positive rail on the breadboard to N/C or N/O depends if you want the buzzer to buzz when the door opens if so connect to N/C, if you want the buzzer to buzz when the door is closed connect to N/O.

Step 5: Finish

Picture of Finish

Now connect the battery clip to the positive and negative rail on the breadboard then plug in the battery and test. You. Can mount this to a door I used blue tack but you can use whatever. If you liked this please like it and also if you need some active buzzers I have some on this link right below.

Active buzzers-


LarsR5 (author)2017-05-24

nice prototype!

If you want to make a usable version the following might help.

If you connect a reed switch to the connectors of a water alarm sensor you have a similar effect.

Conrad in Germany is just selling reduced water alarms fuer some 2,40 Euro.They include buzzer, housing, battery...

(I made a similar project with them using a microprocessor because I wanted to have a delayed and "growing" alarm)

Kalebs-how2s (author)LarsR52017-05-24

thanks good work making a similiar project

Swansong (author)2017-05-24

Thanks for sharing :)

About This Instructable



Bio: enjoy arduino,inventing,diy's and technology check out my ebay at- website- https://kalebshow2s.weebly ...
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