Master courses need to have a practical element, applying already known concepts to concrete problems. In this paper, the design and manufacturing of a radio link using APRS protocol over AX.25 will be presented as coursework during several lab sessions. The aim is to create a system that is able to poll data from several sensors and send them wirelessly with a software implemented signal generator in a microprocessor.

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The measurement of magnetic fields is a complex activity, which can be of significant didactical value. The interference of the numerous sources of magnetic field around the measuring site requires a deep understanding of the fundaments of electronic instrumentation and the particularities of the measurement of magnetic fields. The proposed experimental setup , which makes use of a 3-axes magnetometer controlled from an Arduino board, also gives the students the chance to practice embedded programming.

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