We are all familiar with motion sensors at the back entrance to a residence, illuminating the terrace or the garden when we go out in the dark. Sometimes it is a separate device attached to the wall. In other cases, the motion sensor is integrated into a lighting fixture. Less common is the use of motion sensors inside the home.
Motion sensors for interior use
Generally, interior devices are built into a traditional in-the-wall box and set at switch height. As soon as someone passes into the detection beam, the sensors switch on the light. You no longer risk bumping into a wall, door or closet with your hands full of children, school bags, groceries or rubbish bags.
Such sensors provide a genuine measure of safety and convenience. In addition, they can automatically turn off the lights after a pre-defined period. Consequently, the lights no longer remain on unnecessarily, saving both energy and money.
In general, motion sensors are located in passageways such as the entry, stairways and hallways, or in a garage. They only operate when they detect movement. For this reason, it is not advisable to use them in the bathroom or toilet, since motions there are often too small to continuously reactivate the sensor after the pre-defined time has passed. It is not always convenient or comfortable to wave your arms to activate the sensor again.
The precise location of the motion sensor in the room is important. The best position is at 90° to the principal direction of passage. When aimed in the direction of travel, the sensor will have a harder time detecting movement. The detection angle is also important. In most cases, it is best to opt for a 180° detection arc.