LED gates for measuring kinematic parameters using the ambient light sensor of a smartphone

Nowadays, electronic devices (especially smartphones) are developed to use as an alternative tool for recording experimental data in physics experiments. This is because of the embedded sensors in a smartphone such as the accelerometer, gyroscope, magnetometer, camera, microphone, and speaker. These...

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Bibliographic Details
Published in:The Physics teacher 2021-04, Vol.59 (4), p.298-299
Main Authors: Namchanthra, Witchayaporn, Puttharugsa, Chokchai
Format: Article
Language:English
Subjects:
Handheld Devices
Light
Measurement Equipment
Motion
Physics
Science Equipment
Science Experiments
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Summary:Nowadays, electronic devices (especially smartphones) are developed to use as an alternative tool for recording experimental data in physics experiments. This is because of the embedded sensors in a smartphone such as the accelerometer, gyroscope, magnetometer, camera, microphone, and speaker. These sensors were used in physics experiments, such as the simple pendulum, spring pendulum, coupled pendulum, circular motion, Doppler effect, and spectrum of light, as well as video motion analysis. This paper describes a method for measuring the position-time of a moving object using the ambient light sensor of a smartphone. In the experiment, light-emitting diodes (LEDs), called LED gates, are arranged with equal distance on an inclined plane. A smartphone is attached to a cart and acts as the moving object on the inclined plane. With the appropriate application, the ambient light sensor of the smartphone measures the intensity of the LEDs with respect to time while the smartphone moves along the inclined plane. The results obtained using the LED gates method are in good agreement with that obtained using the video analysis method.
ISSN:0031-921X
1943-4928
DOI:10.1119/10.0004165