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Since the Bluetooth Low Energy (BLE) with version 4.0 of the Bluetooth Core Specification was introduced by Bluetooth Special Interest Group in 2010, the BLE technology has been developing in a wide variety of applications such as the Internet of Things, sports and fitness equipment, home automation, health care, and mobile payment for bringing a comfortable life to the human. In this work, we propose the hybrid mobile application which can remotely control the BLE-based humidifier device. A free and open source ionic framework is used for building beautiful cross-platform hybrid applications. Our proposed application needs to work on both Android and iOS mobile operating systems, and the latter requirement of the application is to control the functions of humidifier device such as turn on and off, adjust the operating time and power of humidity, and receive current humidity percentage, temperature level, and water indicator status from the humidifier.

The electrical resistance, R, of an array of 30 palladium nanowires is used to detect the concentration of dissolved hydrogen gas (H(2)) in transformer oil over the temperature range from 21 to 70 °C. The palladium nanowire array (PdNWA), consisting of Pd nanowires ∼100 nm (width), ∼20 nm (height), and 100 μm (length), was prepared using the lithographically patterned nanowire electrodeposition (LPNE) method. The R of the PdNWA increased by up to 8% upon exposure to dissolved H(2) at concentrations above 1.0 ppm and up to 2940 ppm at 21 °C. The measured limit-of-detection for dissolved H(2) was 1.0 ppm at 21 °C and 1.6 ppm at 70 °C. The increase in resistance induced by exposure to H(2) was linear with [H(2)](oil)(1/2) across this concentration range. A PdNWA sensor operating in flowing transformer oil has functioned continuously for 150 days.