We share the design for a simple apparatus that, when paired with an Arduino processor and a computer, can be used in a wide range of laboratory measurements: observing linear kinematics, confirming Faraday's and Lenz's laws, measuring magnetic moments, and observing the effects of eddy currents. The setup is simple, inexpensive, easy to replicate, and can even be fabricated and used by students working at home.

1.
See https://github.com/cedt/SoS for Python and Arduino code files, schematic and board layout files, etc.
2.
<https://docs.arduino.cc/software/ide-v1> for downloading Arduino IDE.
3.
Unofre
Pili
,
Renante
Violanda
, and
Claude
Ceniza
, “
Measurement of g using a magnetic pendulum and a smartphone magnetometer
,”
Phys. Teach.
56
,
258
259
(
2018
).
4.
Martin
Connors
, “
Measurement and analysis of the field of disk magnets
,”
Am. J. Phys.
40
,
308
311
(
2002
).
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