When the laser beam is interrupted, the output voltage drops, the Arduino sees that voltage drop and then turns on the alarm buzzer. The value that triggers the alarm is set mid-way between the ...

Instead, he was looking for something to build using a laser range ... project uses an Arduino along with a character LCD and speaker to display distance and sound an alarm when the car is within ...

Powered by an Arduino Uno, this laser tripwire alarm project works much like those in movies. There's a tripwire — made up of a laser directed at a light sensor — that's placed somewhere the intruder ...

We've developed numerous Arduino modules for various fields of teaching. Each section is divided into kindergarten through 6th grade and 6th grade through 12th grade. While some of these modules can ...

100% Brand New, High Quality Car Power Charger/Adapter Fits Cobra XRS 9330 XRS 9340 XRS 9345 XRS 878 Radar Laser Detector XRS9330 XRS9340 XRS9345 XRS878 Fits Cobra XRS-R7 XRS-R8 XRS-R9G XRS-777 ...

We independently review everything we recommend. When you buy through our links, we may earn a commission. Learn more› By Joanne Chen and Annie Chou Our upgrade pick, the Philips SmartSleep ...

We earn a commission from partner links on Forbes Home. Commissions do not affect our editors' opinions or evaluations. Home security systems help keep your family and possessions safe while you ...

If you need high-quality printing in a snap, a laser printer can produce clean, sharp prints in as little as a few seconds. But, after three weeks of testing each device, not all laser printers ...

The best laser printers on the market are the ones that consistently deliver pages of high quality at lower printing costs than the competition, without causing you headaches. I know because my ...

The best color laser printers are a great investment that can save you time and money compared to cartridge-based inkjet printers. Laser printers use toner, which lasts a long time, delivering a ...

Amazon's already expansive lineup of Alexa-enabled devices keeps growing. The latest addition: A smart alarm clock that might make mornings tolerable. If you're the type of person who needs a bit ...

What is the best overall home security system? For total home coverage with an eye on important access points inside your house, nothing works as well as a complete security system, which includes ...