Wireless sensor node design for heterogeneous networks

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Harte, Seán
O'Flynn, Brendan
Martínez-Català, Rafael V.
Popovici, Emanuel M.
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Two complementary wireless sensor nodes for building two-tiered heterogeneous networks are presented. A larger node with a 25 mm by 25 mm size acts as the backbone of the network, and can handle complex data processing. A smaller, cheaper node with a 10 mm by 10 mm size can perform simpler sensor-interfacing tasks. The 25mm node is based on previous work that has been done in the Tyndall National Institute that created a modular wireless sensor node. In this work, a new 25mm module is developed operating in the 433/868 MHz frequency bands, with a range of 3.8 km. The 10mm node is highly miniaturised, while retaining a high level of modularity. It has been designed to support very energy efficient operation for applications with low duty cycles, with a sleep current of 3.3 μA. Both nodes use commercially available components and have low manufacturing costs to allow the construction of large networks. In addition, interface boards for communicating with nodes have been developed for both the 25mm and 10mm nodes. These interface boards provide a USB connection, and support recharging of a Li-ion battery from the USB power supply. This paper discusses the design goals, the design methods, and the resulting implementation.
Heterogeneous networks
Harte, S., O'Flynn, B., Martínez-Català, R.V., Buckley, J., Popovici, E.M., 2008. Wireless sensor node design for heterogeneous networks. In: IMAPS (International Microelectronics And Packaging Society)-CPMT(Components, Packaging and Manufacturing Technology) 32nd International Microelectronics and Packaging IMAPS-CPMT Poland Conference. Warszawa-Pułtusk, Poland 21-24 September 2008.
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