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A motion sensor is a sensor that helps to detect movement in the vicinity it is operating, it does this by using either one or more technologies. Often used within security systems these sensors will detect movement in a specific area before sending a signal to a control panel where it will alert its user.

There are various different types of motion sensors that need appropriate integrated circuits to help them function, RS stock a range of sensor ics that all help detect motion such as Accelerometer sensors, Hall Effect sensors, Inclinometer sensors and Position sensors.

### Motion sensor technologies

There are various different technologies used within motion sensors here is a list of some of the most common:

- PIR Motion sensors or Passive infrared- this type of technology identified heat or infrared energy.
- Microwave- by sending out MW signals this type of technology is able to measure the reflection off of a moving object.
- Area Reflective Type- emitting infrared rays from an LED, area reflective technology is able to measure the distance of a person from an object.
- Ultrasonic- by sending pulses of ultrasonic waves it can measure the reflection of a moving object.

### What are the most common applications that Motion Sensors are used in?

Here is a list of the typical applications a motion sensor can be used:

- Intruder Alarms
- Automatic Ticket Gates
- Entry Way Lighting
- Security Lighting
- Automated Toilet Flushers/ Hand Dryers
- Automatic Doors


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Motion Sensor ICs | Hall Effect Sensors | RS

Motion Sensor ICs

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Magnetometers | RS

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Honeywell Motion Sensor ICs | RS

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Position Sensors | RS

<p>Position sensors are integrated circuits (IC) which sense the movement or position of an object. They convert this measurement information into analogue or digital output signals. Position sensors essentially take the information to/from a fixed position and provide feedback.</p><p>There are different types of sensors for different requirements. A popular position sensor is an LVDT (linear variable differential transformer).</p><h2>What do these sensors measure?</h2><p>Position sensors measure by a range of different methods such as:</p><ul><li>Rotation (Rotary)</li><li>Angle</li><li>Accuracy</li><li>Distance</li></ul><h2>What are linear position sensors?</h2><p>Linear position sensors are accurate sensors which measure the linear position of a device. Linearity is important for engineering applications. It measures the position of an object within a linear, straight line.</p><h2>What are rotary position sensors?</h2><p>Rotational position sensors detect the movement of an object's to give their angular position.</p><h2>What are resistive position sensors?</h2><p>Resistive position sensors use resistance to measure the position. This is a physical variable.</p><p>Position Sensor can be used in a range of different application, some of which include...</p><ul><li>Home appliances</li><li>Robotics</li><li>Gaming Lighting</li><li>TV Computers</li><li>Automotive</li><li>Automation</li><li>Coordinate measurement</li><li>Industrial motion control</li></ul>

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Accelerometer Sensors | RS

<p>An accelerometer is an integrated, built-in module or circuit that accurately detects and measures the acceleration and motion of the application it is attached too. The type of measurement they measure is the rate of velocity change in an object. They commonly measure in G-forces (g) or in meters per second squared (m/s2).</p><h2>How do Accelerometer Sensors work?</h2><p>This particular type of sensor is used to measure static (gravity) or dynamic forces (vibration and motion) in acceleration. An accelerometer can measure acceleration with up to three axis units.</p><p>These acceleration sensors usually contain internal capacitive plates, some are fixed whilst others are attached to very small springs. These internally move as acceleration forces are happening on the sensor. When these plates move, the capacitance changes between them and from these changes, the acceleration can be determined.</p><p>Another type of accelerometer, is a Piezoelectric Accelerometer. These sensors contain minuscule crystal structures that output electrical charge if they ever fall under any mechanical stress, in this instance the stress would be acceleration.</p><h2>What are Accelerometer Sensors used for?</h2><ul><li>Gaming systems</li><li>Mobile devices</li><li>Disk drive protection</li><li>Image stabilisation</li><li>Sports and health devices</li><li>Industrial applications</li><li>Commercial applications</li><li>Did you know?</li></ul><p><strong>Did you know </strong>that a single G-force on planet earth amounts to 9.8 m/s2? This figure can vary, depending on elevation and will be different on other planets because of the difference in gravitational pull.</p>

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Hall Effect Current Sensors | RS

<p>Hall Effect Current Sensors named after it's founder American physicist Edwin Hall, allowing non-contact detection of two types of currents which are alternating and direct. These types of sensors are activated by an external magnetic field. In this generalized device, the Hall sensor detects the magnetic field produced by the magnetic system. The magnetic system is known as the Hall element. A hall element is a magnet-electric converting element.</p><h2>Why use a Hall Effect Current Sensors over other technology?</h2><p>These current sensors help to minimise the power loss of the target current circuit whilst still utilising its simple design without hindering reliability and accuracy. These sensors are designed for AC or DC current sensing in industrial, commercial, and communications systems.</p>

Position Sensors

What do these sensors measure?

What are linear position sensors?

What are rotary position sensors?

What are resistive position sensors?

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