Laser System
What are the minimal requirements for a home made laser alarm system?
I have now a LDR resistor, a laser, a buzzer and a few resistor.
The problem is: if a laser is on, the buzzer beeps, but when it is off, nothing happen.
What else do I need for a working system?
Learn about digital logic. What you’re looking for is a not gate, a lot of people would just use a nand gate but tie the two inputs together to make a not gate. Better yet, go to Radio Shack and buy a working system.
Photonic Fence Anti-Mosquito Laser System
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NorCross Marine Sonic Laser Scale XP $79.99 The NorCross Marine Sonic Laser Scale XP is a multifunction ultrasonic fish measuring device that doubles as a solid state digital scale. Traditional fish measuring devices require the user to lay a fish on a measuring board or stretch out a conventional measuring device. Well documented research indicates that laying a fish on its side creates considerable damage to internal organs and removes th… |
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Extech EX450 True RMS Autoranging Multimeter with Infrared Thermometer $119.99 Compact and powerful, the Extech EX450 Eight-Function True RMS Professional MultiMeter provides the versatility of multiple meters in one convenient device. The EX450 measures AC/DC voltage and current, resistance, diode, and temperature. It also includes a built-in, non-contact infrared thermometer that allows you to detect invisible hot spots, as well as a True RMS function for correcting any di… |
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NorCross Marine Sonic Laser Scale SP $49.99 The Norcross Marine Sonic Laser Scale SP is a multifunction, ultrasonic fish measuring device that doubles as a digital fishing scale. Traditional fish measuring devices require the user to lay a fish on a measuring board or stretch out a conventional measuring device. Well documented research, however, indicates that laying a fish on its side creates considerable damage to internal organs and rem… |
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Avery 047318 Matte White CD Labels for CD Stomper Pro (15-Pack) $17.99 CD labels are laser and inkjet compatible. Won’t lift, peel off or wrinkle inside CD drive or player. Labels are refills for CD Stomper Kit, which includes applicator, software and predesigned templates…. |
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Dj Sound Effects (Dj Tools for Club & Bashment) (Dancehall Ragga Hip Hop Sound FX) $6.99 … |
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Chalice $11.97 … |
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Belkin BE112230-08 12-Outlet Home/Office Surge Protector with Telephone and Coaxial Protection $16.00 SAFETY COVERS FOR OUTLETSSLIM DESIGN FOR COMPACT STORAGEORGANIZES CABLES WITH DETACHABLE CORD MANAGEMENT CLIPFLAT-PROFILE PLUG12 OUTLETSTELEPHONE & COAXIAL PROTECTION3780 JOULES8-FT POWER CORDLIFETIME WARRANTY$300000 CONNECTED EQUIPMENT WARRANTYUPC : 722868594322Shipping Dimensions : 14.75in X 6.00in X 2.00inEstimated Shipping Weight : 2.15… |
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Belkin Pivot-Plug Surge Protectors $26.99 Features a rotating outlet design that gives you much more convenience and flexibility in placing your plugged-in devices than traditional products Belkin Pivot Plug Surge Protectors provide premium power protection for your professional workstations and connected devices. It’s rotating outlet design gives you much more convenience and flexibility in placing your plugged-in devices than traditiona… |
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Nite Guard Solar NG-001 Predator Control Light, Single Pack $16.67 The Nite Guard solar-powered night predator light is a maintenance-free unit that keeps nocturnal predators away from your birds, livestock and property. Dimensions L x W x H (in.): 3 x 1 x 2, Removal Of: Nocturnal predators, Single, Pair, or Set: Single, Power Source: Solar, Indoor/Outdoor Use: Outdoor, Material Type: Sealed temperature resistant plastic, Includes: Auto on/off… |
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Reel Money $1.99 … |
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