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This paper focuses on the design and application of low power and low-frequency localization system using received signal strength indication (RSSI). The receiver will wake up from sleeping mode by a modulated magnetic field emitted from a transmitter module. Then it will send messages containing the Received Signal Strength Indication (RSSI) via WiFi with Message Quest Telemetry Transport (MQTT) protocol to an MQTT broker. Using the magnetic coupling effect and RSSI ranging, the system is a unique candidate for low power security-positioning purposes.

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The valve mode is the most common operational mode of magnetorheological fluid (MRF) devices in engineering applications. Magnetorheological (MR) valves have been studied upon their self-sensing capabilities resulting from the electromagnetic induction phenomenon. In parallel, studies have been carried out regarding the microstructural properties and the analytical modeling of MRFs used in valves. This paper presents the design and fabrication of a microfluidic system in the form of a magnetic circuit, consisting of a MRF flow channel, with dimensions close to those of previously studied miniaturized MR valves. The channel is enclosed in ferromagnetic and transparent sheets. The sheets facilitate the magnetic field distribution, created by a coil. The channel allows the microscopical MRF particles observation and their correlation with the MRF magnetic and rheological properties when the self-sensing phenomenon occurs.