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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
-breadboard

Step 1: Step 1

Put the active buzzer on the breadboard

Step 2: Step 2

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

Step 3: Step 3

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

Step 4: 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

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- http://www.ebay.com.au/itm/182557930221?ssPageName=STRK:MESELX:IT&_trksid=p3984.m1555.l2649
<p>nice prototype! </p><p>If you want to make a usable version the following might help.</p><p>If you connect a reed switch to the connectors of a water alarm sensor you have a similar effect.</p><p>Conrad in Germany is just selling reduced water alarms fuer some 2,40 Euro.They include buzzer, housing, battery...</p><p><a href="https://www.conrad.de/de/wassermelder-mit-internem-sensor-ew13-batteriebetrieben-751518.html" rel="nofollow">https://www.conrad.de/de/wassermelder-mit-internem...</a></p><p>(I made a similar project with them using a microprocessor because I wanted to have a delayed and &quot;growing&quot; alarm)</p>
<p>thanks good work making a similiar project</p>
<p>Thanks for sharing :)</p>

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Bio: enjoy arduino,inventing,diy's and technology check out my ebay at- https://www.ebay.com.au/sch/jodhamman/m.html?_nkw=&amp;_armrs=1&amp;_ipg ...
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