How to Block a Monitor Sensor? Easy DIY Guide

Motion detectors can quickly throw cold water to ideas to shock your loved ones. This is particularly the case when you do not have access to the sensor or can’t turn it off. As sounding an alarm is not an option, turning off the motion sensor might be a good choice.

If the idea of blocking a motion sensor has happened to you, continue reading as we discuss how to do so.

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What Cause The Motion Sensor To Trigger?

Numerous motion sensor types bring a wide range of potential objects that could trigger a motion sensor, generally when you don’t want them to. Following are the causes that trigger motion sensors:

1. Wind-Blown Objects

Some sensors can be set off by items that are carried by the wind or air conditioning. Depending on the sensor, it is generally only possible with indoor sensors that use microwaves or ultrasonic technology.

A motion detector will likely be activated if the windows open wide, a strong wind sweeps the curtains high into the room, or the air conditioning scatters a stack of papers.

2. Animals

Some motion sensors, whether indoor pets or wildlife, are activated by animals that trigger sensors installed outside your home. However, not all sensors are activated by animals; it varies on animal size and kind.

Infrared heat signals activate the majority of outdoor PIR motion sensors. Thus an animal would need to be warm-blooded and be large enough to show a temperature change for the motion detector.

3. Humans

Motion sensors are made to turn on when a human is around; therefore, they may be the most common reason to trigger.

Since motion sensors don’t use cameras or rely on light, they always detect the presence of a person when they enter their range of view, regardless of the time of day or night.

Ways to Block a Motion Sensor

Before blocking a motion sensor, it is necessary to consider its type, location, range of view, and blind spots. Once concluded, blocking motion sensors is all about disabling the sensors’ triggers to operate. Here are some ways to block various sensors:

1. Strong Magnetic Field

This one is mainly for door and window sensors, whose operation depends on magnetic strips. A strip is present on the door and the frame, which are connected to create a circuit. A trigger happens when that circuit is broken.

This design, however, is quite basic and sensitive to the presence of a powerful magnetic field. The sensor would stop functioning if you added another magnet with a greater magnetic field.

2. Aluminum Foil

Aluminum Foil is one of the most efficient ways of blocking a motion sensor. Because of its excellent conduction qualities, aluminum can completely block radio and other electromagnetic waves. Covering the sensor’s lens gradually lessens its sensitivity and ultimately blocks its vision.

3. Black Tapes

In some cases, black electrical tapes have also been efficient in blocking a motion sensor. Once you’ve reached the sensor carefully without triggering it, start applying the tape from the side and gradually cover the entire surface.

4. Styrofoam

Styrofoam is a great insulator. It effectively reduces heat and may provide a strong barrier to a motion sensor. However, it seems a bit excessive to wrap yourself in styrofoam. It will still be a choice if you have to walk the mile.

5. Cardboard

You can reduce The sensor’s area of view using pieces of cardboard. Try to block its view by raising it against the camera’s lens. If the cardboard is too thin or the sensor sees through it, it won’t be completely blocked.


What kinds of motion sensors are there?

By using receiving and emission detecting processes as criteria, motion sensors can be classified.

Passive motion sensors depend on infrared technology, which uses passive heat sensing to detect movement.

Active motion sensors are based on radar technology. When a radio wave hits a moving item, it boomerangs back to them, allowing them to send and receive data.

Combined motion sensors use various technologies but are not suitable for all locations. Some operate outside more effectively than others, and inversely.

Access control systems widely use a few of these to improve security.

Can lights activate a motion sensor?

Lights may activate Motion Sensors. Lights with abrupt temperature changes can trigger motion sensors that detect infrared radiation. When there is a sharp shift in light intensity, motion sensors that use image comparison can also be activated by light.

Why does my camera pick up motion even if there is nothing?

The camera may occasionally catch erroneous motion clips if it has a poor connection to your internet network. This problem should be fixed by lengthening the retrigger time. You can also relocate the camera nearer to your wireless router.

Which factor contributes to false alarms the most commonly?

Simple user error is responsible for about 80% of false alerts. Installation errors and poor system upkeep are two more prevalent reasons. The good thing is that most of these false alarms can be prevented.

How can false alarm issues be avoided?

Here are some techniques for preventing false alarms:

  • Deal with a professional home security agency to design and install your wireless security alarm system.
  • Purchase a good system
  • Take the right training
  • Lock all windows and doors
  • Make use of verification techniques
  • Train the children
  • Get the system checked out and maintained


You have concluded the article, which covers blocking motion sensors. We have discussed various ways to stop the motion sensor from activating. It would be necessary to have prior information about the sensor and the surroundings to block a motion sensor. In addition, we addressed frequently asked questions about motion sensors. Many thanks for reading!

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