Wireless Motion Sensor - PS-3219



The Wireless Motion Sensor measures position, velocity, and acceleration of objects using ultrasound. Students can measure themselves and watch their motion graphed in real-time.

The Wireless Motion Sensor can detect objects within a range of 15 cm to 4 m away. The fact that the sensor is wireless means no cables to get in the way which is key for hand held, or ceiling mounted applications and itconnects directly to your devices via Bluetooth® or USB.

The Wireless Motion Sensor works with our free MatchGraph! software, an ideal way to teach the concepts of motion graphing, interpreting graphs, and rate of change or slope.

Typical Applications

  • MatchGraph! - Our free motion graphing app
  • Measure the motion of moving objects
  • Discover the relationship between position, velocity, and acceleration
  • Measure objects in freefall
  • Measure how air resistance affects falling objects
  • Investigate frames of reference
  • Investigate conservation of Energy and momentum of cart collisions
  • Investigate simple harmonic motion
  • Model seafloor mapping

Special Features

  • Reports position, velocity, and acceleration
  • False Target Rejection Technology for clean data
  • Clips directly to PASCO dynamics tracks
  • Rod clamp for mounting
  • 180° pivoting head
  • Rechargeable lithium-ion battery
  • Bluetooth® or USB connectivity

Bluetooth Low Energy Wireless Connectivity

Required Software:

PASCO products that use Bluetooth® Low Energy connectivity (wireless sensors, Smart Carts, and the AirLink) require the latest versions of our software.

PASCO Capstone is available for Mac and Windows. SPARKvue is available for Mac, Windows, iOS, Android and Chromebooks.

Additionally, the Wireless Motion Sensor and Wireless Smart Carts can be connected via Bluetooth and used with our MatchGraph app.

Compatibility/System Requirements

Any current model Chromebook, Mac, iPad, iPhone, Android tablet or phone will support direct connection to PASCO Bluetooth Low Energy devices. Also, any Windows 10 device with Creators Edition 1703 or later will support direct connection.

Chromebook users MUST have the latest firmware updates for ALL wireless sensors in order to use them without the USB Bluetooth Adapter. Full information.

All other Windows computers/tablets, older Macs, and Chromebooks without updated sensor firmware currently require the PS‑3500 USB Bluetooth Adapter to connect to PASCO’s Bluetooth Low Energy devices.

Full compatibility details are available, including compatibility information for older computing devices.

How It Works

The Wireless Motion Sensor uses echolocation, similar to a dolphin or a bat. In order to determine the distance to an object, an ultrasonic pulse is emitted from the sensor which then listens for a signature ‘echo’ reflected back from the object’s surface. The distance to the object is calculated based on the time of flight between the ultrasonic pulse to the detected echo, and the speed of sound.

Measurements of velocity and acceleration are derived algorithmically using numerical methods. This provides a balanced approach to calculating numerical derivatives which yields noise reduction while minimizing smoothing effects on high frequency peaks.




  • 0.15 to 4 m
  • 1 mm
Maximum Sample Rate
  • 50 Hz
Transducer Rotation Range
  • 180°
  • Rod Mount
  • ¼-20 Mounting thread
  • Rechargeable Lithium-Polymer
  • (Expected life of 3-4 months on a single charge with normal use)
Logging mode
  • No
  • Direct USB or via Bluetooth® Smart (Bluetooth 4.0)
  • Max wireless range of 30 m (unobstructed)

Buying Guide

USB Bluetooth Adapter

Windows devices, Chromebooks and older Macs lack native Bluetooth® Smart support and require an adapter to use PASCO wireless products.

All current model Macs, iPads, iPhones, Android tablets or phones support direct connection to PASCO Bluetooth Smart devices and do not require the adapter.

Full compatibility details are available.

USB Bluetooth Adapter   PS-3500
Motion Sensor Bracket
Motion Sensor Guard
Motion Sensor Bracket   PS-2546
Motion Sensor Guard   SE-7256

Software Required

This product requires or recommends PASCO software for data collection and analysis. Either SPARKvue software, PASCO Capstone software or MatchGraph! software may be used.