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Vernier WDSS Manual
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Vernier WDSS Manual

Wireless dynamics sensor system
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Wireless Dynamics Sensor System
(Order Code WDSS)
The Wireless Dynamics Sensor System (WDSS) allows you to take data from a
three-axis accelerometer, force sensor, and altimeter, using a Bluetooth
connection to your computer. It is the perfect tool for dozens of physics and physical
science experiments such as:
• Studying the motion of a dynamics cart on a track. The WDSS can be mounted
on a cart, avoiding the problems associated with wires when using conventional
accelerometers and force sensors.
• Amusement park and playground rides. The WDSS has internal memory and can
collect acceleration and altitude data (to get a profile of the ride) for over 100,000
readings over several minutes. You can store multiple runs before retrieving the
data.
• Studying simple harmonic motion by mounting the WDSS as an oscillating mass
hanging from a spring.
• Studying accelerations of skateboarders or dancers with a WDSS mounted on
them while data are recorded on a nearby computer.
• Studying forces and accelerations during circular motion by mounting the WDSS
on a turntable or bicycle wheel.
In addition, you can use the WDSS to do other traditional experiments that you do
with conventional accelerometers and force sensors. You will find more information
on experiments you can do with the WDSS later in this manual.
The WDSS hardware
The photo below shows the Wireless Dynamics Sensor System with the key parts
identified.
®
wireless
• On/Off Switch: The switch controls the power to the WDSS. Turn the switch off
when you are not using the WDSS. Data stored in the WDSS memory will not be
lost when you turn off the power.
• Battery Charging LED: This yellow LED indicates when the WDSS batteries
are being charged. The LED will come on as soon as the WDSS is plugged in
unless the battery is already 100% charged. The LED will go off when the battery
becomes fully charged.
• Power Connector: This connector is used with a 6 V DC, center-negative power
supply, like the one included with the WDSS or with a Vernier LabPro interface.
This power supply is Vernier order code IPS.
2

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Summary of Contents for Vernier WDSS

  • Page 1 It is the perfect tool for dozens of physics and physical science experiments such as: • Studying the motion of a dynamics cart on a track. The WDSS can be mounted on a cart, avoiding the problems associated with wires when using conventional accelerometers and force sensors.
  • Page 2 This means that data are being moved around in the WDSS internal If you leave it unpowered for many weeks, the rechargeable batteries may lose much memory. Do not turn off the WDSS power when this LED is flashing red. If you of their charge.

  • Page 3: Bluetooth Devices

    LEDs on the WDSS. depends on the Bluetooth hardware in your computer. 6. If your WDSS does not connect, make sure it has battery power and that it is We will use the following terminology to describe how Bluetooth is used when within Bluetooth range.
  • Page 4 Here The sensors of the WDSS generally do not need to be calibrated. If you ever want to is a complete list of sensor configuration options: calibrate them, you can.
  • Page 5 This means that you can repeat a remote data collection run. You can repeat this as often as you like (up to 20 runs), until you fill the memory of the WDSS. For • If you take runs with fewer readings you can repeat many remote runs.
  • Page 6 You may also set the number of points to be collected before the trigger condition is it. If you choose No, the data will be left on the WDSS, and you can retrieve or met. This is called Pre-trigger data. Data will be collected in a buffer and the proper delete them later.
  • Page 7 Forces as small as 0.01 N and as large as 50 N can be measured by the WDSS. There Wire hook with plastic lock nut–The hook is used to measure pulling forces (or are actually two force sensing systems inside the WDSS.
  • Page 8 WDSS. To minimize this effect, simply place the sensor in the orientation in which it the Vernier dynamics cart. Then lower the WDSS on top of the cart and insert the will be used (horizontal or vertical) and choose Zero from the Experiment menu or binding barrel in the large hole of the WDSS.
  • Page 9 The signal is filtered Hand Held Force Sensor Experiments and sent to the analog input of the WDSS. The acceleration reading from each of the three axes is transmitted by Bluetooth to the computer or stored internally during The aluminum rod can be used as a convenient handle for holding the WDSS in your hand for some experiments.
  • Page 10 One example cell. If you drop the WDSS and it lands on anything attached to the load cell of the you can open is at Experiment Files/Probes and Sensors/WDSS/Scalar Acceleration.
  • Page 11 1. Orient the WDSS with the x-axis arrow pointing up for the first calibration point. 2. Define this as +9.8 m/s or +1 g. 3. Rotate the WDSS so the arrow for the x-axis points down and use this reading for the second calibration point. 4. Define this as –9.8 m/s or –1 g.
  • Page 12 If you take the WDSS to a very different altitude, turn its power off and back on one time before collecting remote data. This allows the WDSS electronics to adjust for the large change in air pressure. For example, if you set up the WDSS for remote data collection in your lab at approximately sea level and take it into the mountains for data collection cycle the power off and on before collecting data.
  • Page 13 Another option is to screw a vertical rod through the this will probably involve moving your computer up and down also. It would hole in the WDSS and mount the WDSS stationary at the end of the track and have work best with a laptop computer.
  • Page 14 Studying Friction Force and acceleration graphs Use the force sensor of the WDSS as a replacement for a spring scale. Run a string from the hook on the WDSS force sensor to a block of wood. Measure the force as you pull the block along a horizontal surface.
  • Page 15 Acceleration and force in simple harmonic motion Experiments Using Just the Accelerometers • Damped Harmonic Motion: Hang the WDSS from its force sensor at the end of Some of the best and simplest experiments involve using just one accelerometer at a rubber band so that it undergoes harmonic motion.
  • Page 16 78 RPM. Jump landing with knees held stiff • Measure the acceleration of a car. The WDSS was placed on the level floor of a car with the x-axis oriented toward the front of the car. The car was started from rest and accelerated to 65 mi/hr (29.1m/s) while taking WDSS acceleration data.
  • Page 17 • Mount the WDSS on a free-turning wheel, such as a bicycle wheel. Give it a spin and allow it to slow gradually. Below are graphs made this way with the wheel mounted with its axis vertical and horizontal. Centripetal acceleration (wheel horizontal)
  • Page 18 WDSS can be picked up by the computer. Here is the resulting graph. One of the great ways to use the WDSS is on amusement park rides. Here are some examples using just the WDSS accelerometers. Later in this manual, we will have examples where the altimeter is also used.
  • Page 19 Lenz’s Law magnetic forces on the falling cars. They always move in WDSS can be used to record position on the ride. In general, it does not matter that the vertical direction. The lower graph below shows the acceleration. The top graph the altitude be calibrated well;...
  • Page 20 Bluetooth radio frequency: approximately 2.45 GHz (2450 MHz), with frequency hopping, so the frequency is not fixed Wireless Range: Up to 10 meters (30 ft) with no obstruction. Number of WDSS devices that can be connected to one computer: 7 Force Sensor Range: ±50 N Frequency Response: 0–100 Hz...
  • Page 21 • If your computer has a removable Bluetooth transceiver, try removing it and then plugging it in again. • The WDSS internal memory is full. There is not enough room to store the run you have set up. Reconnect your WDSS to the computer and delete data from the •...
  • Page 22 The normal forces in all three directions make up the still. Similar affects can show up when you sample with the WDSS at a rate sum of all contact forces on the sensor body.

  • Page 23: Warranty

    A: We avoid the term g-force because the quantity doesn’t have units of force. Logger Pro, Vernier LabPro, Go! Link and other marks shown are our registered Instead, g-factor can be used as a simplified label for Normal Force per Unit trademarks in the United States.
  • Page 24 Vernier Software & Technology 13979 S.W. Millikan Way • Beaverton, OR 97005-2886 Toll Free (888) 837-6437 • (503) 277-2299 • FAX (503) 277-2440 info@vernier.com • www.vernier.com Rev. 3/30/2011 Printed on recycled paper.