  Using smartphones in experimental physics teachings offers many advantages in
term of engagement, pedagogy and flexibility. But it presents the drawbacks of
possibly endangering the device and also facing the heterogeneity of available
sensors on different smartphones. We present a low-cost alternative that
preserves the advantages of smartphones: using a microcontroller equipped with
a large variety of sensors that transmits data to a smartphone using Bluetooth
Low-Energy protocol. This device can be lent to students with little risks and
used to perform a wide range of experiments. It opens the way to new types of
physics teachings.
