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Burglar alarm project with circuit diagram kelebihan dan kekurangan fire gudangsafetycom automatic alram using transistor ic and ardino system todays circuits engineering projects two zone instructions of a simple reliable touch activated security scientific 9 ideas electronics what is conventional wiring etechnog thermistor 555 timer sensitive an quora door opening laser ldr how to make basic control smoke detector mq02 home cmos based single under repository 44946 next gr the unit steps build 5 for protecting your office from theft homemade expandable scr idea cheap infrared intelligent it works explained diy