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I made a Burglar Alarm for under 5 bucks, and items I found laying around the house! No soldering required. (soldering optional)
$5 Dollar Burglar Alarm!by johnnyrockstah
Arduino-based Burglar and Fire Alarm Systemby mykh
Burglar Alarm Circuitby andrea1972
2 Minute PIR Alarmby Robotix_au
Burglar Alarm- LinkIt Oneby Pooja_Baraskar
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