Troubleshooting

  • Primary test: When you start data collection, do you hear a clicking from the Go!Motion? If not, the sensor may be defective. Sometimes the switch on the inside of the Go!Motion gets stuck between the two positions. Try vigorously flipping the switch back and forth.
  • Secondary test: If the Go!Motion is not working, the cable could be malfunctioning. Try a cable from a working unit.
  • Tertiary test: To test accuracy, find a wall with no desks, chairs, doors, or other obstructions within a 2 m field. Hold the Go!Motion in your hand, 0.5 m from the wall with the gold disc pointing directly at the wall. Do you get the expected 0.5 m reading? Back off to 1.0 m. Do you get 1.0 m? Back farther off to 1.5 m. Do you get 1.5 m?
  • Quaternary test: Motion Detectors use ultrasound to measure position. Other sources of ultrasound may be interfering with the signal. Those sources include air tracks, CRT computer monitors, fluorescent lights, and power distribution panels. Identifying these sources can be challenging. You may have to resort to moving the Go!Motion away from interfering equipment. In the case of noisy fluorescent lights, turn them off (but we rarely see this problem).

The LED on the Go!Motion is a useful troubleshooting tool. When working correctly, the LED on the Go!Motion is green. If your LED is not green, see The LED on my Go! device or LabQuest Mini is not green. What does that mean?

Additional Troubleshooting

For additional tips related to using motion detectors, see Motion Detector Troubleshooting and FAQs

Specifications

  • ultrasound frequency: 50 kHz
  • resolution: 1 mm
  • accuracy: 2 mm
  • range: 0.15 m to 6 m
  • speed of ultrasound used to calculate distance: 343 m/s *
  • power: 51 mA while running

* The Go!Motion has a built-in temperature sensor and applies a correction to the speed of sound automatically.

Calibration

There is no need to calibrate the Go!Motion.

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