[Brad] was asked by his Sister to design a motion-based alarm ... active at night and can be battery-powered. What he came up with is a light-sensitive motion sensor that uses very little power.

The BOM on [Jeremy S Cook]’s build is extremely short – just a PIR sensor and an optoisolator, with a battery ... it does is trigger the camera when motion is sensed, but one could be added ...

EASY TO INSTALL AND EASY TO OPERATE: Portable motion detector alarm has two power supply options (AAA battery or USB rechargeable), (USB cable must be used to continue to work), which provides ...

Case in point: an easy way to make your backyard, garage, or other outdoor spaces safer and more secure is with this ...

The Arlo Essential XL is a relatively compact security camera despite what its name might suggest. It's only slightly larger ...

EASY TO INSTALL AND EASY TO OPERATE: Portable motion detector alarm has two power supply options (AAA battery or USB rechargeable), (USB cable must be used to continue to work), which provides ...