Wireless Rotary Motion Sensor - PS-3220



The versatility of the Wireless Rotary Motion sensor allows it to be used in a wide range of physics experiments. Typically, it is used in mechanics to study the rotation of rigid objects. When used in combination with PASCO physics apparatus, this sensor also finds applications in studying advanced dynamics topics as well as electromagnetism and optics.

The Wireless Rotary Motion Sensor measures rotational kinematics as well as their linear analogues. The included three-step pulley allows different torques to be applied, rotating a rigid system at different rates of acceleration. The included rod mounting holes let you orient the sensor for different experiments. The Wireless Rotary Motion Sensor connects directly to your devices via Bluetooth® or USB.

While the sensor can be connected to your computer or Chromebook via USB for data collection or to charge the battery, the wireless functionality of the Rotary Motion sensor simplifies the experimental laboratory setup. No interface is required for either wired or wireless operation. Just connect and go!


Typical Applications

  • Rotational inertia
  • Conservation of Angular Momentum
  • Simple Harmonic Motion
  • Cart Kinematics on a track
  • Pendulums (simple, large amplitude, physical, variable-g)
  • Chaos
  • Gyroscopic Motion
  • Polarization
  • Faraday's Law


  • Measures angular position, velocity, and acceleration
  • Measures linear position, velocity, and acceleration
  • Low friction bearings
  • 3-Step Pulley
  • Super Pulley Mounting Shelf
  • Tabletop design
  • Rod Clamp for mounting in almost any orientation
  • Compatible with existing PASCO apparatus
  • 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.


Independent datalogging 

Long term data collection directly on the sensor

In logging mode wireless sensors collect data to their onboard memory for hours, days, weeks or even months at a time without needing to be connected to a computer, tablet, Chromebook or smartphone.

When the experiment is concluded, simply connect the sensor to a device running PASCO software and download all the measurements it recorded.




Three-step Pulley
  • 10, 29 and 48 mm diameter
Sensor Dimensions
  • 9.2 cm x 6.6 cm x 4.1 cm, 6.35 mm diameter shaft
Angular Resolution
  • +/- 0.18° (0.00314 radian)
Linear Resolution
  • With 5 mm pulley radius: 0.0157 mm
  • With 14.5 mm pulley radius: 0.0456 mm
  • With 24 mm pulley radius: 0.0754 mm
  • With 27.5 mm pulley (with o-ring) radius: 0.0864 mm
Maximum rotation rate
  • 30 revolutions per second
Optical Encoder
  • 2000 divisions/rev, Bidirectional
  • Rechargeable Lithium-Polymer
  • (Expected life of 3-4 months on a single charge with normal use)
  • Yes
  • 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

Software Required

SPARKvue software or PASCO Capstone software may be used. PASCO Capstone is available for Mac and Windows. SPARKvue is available for Mac, Windows, iOS, Android and Chromebooks.

Learn more about Bluetooth Compatibility.