POCO: ‘Perpetual’ operation of CO wireless sensor node with hybrid power supply

Abstract

Wireless sensor networks (WSNs) have recently been applied for the detection of a number of hazardous gases. Gas monitoring is of significance, for gas leakage and the resultant penetration of gases into the environment can lead to grave or sometimes fatal consequences. In this work, we propose a sensor node architecture for a wireless outdoor CO monitoring unit with an emphasis on the energy efficiency of measurements and optimal power supply mechanism. To guarantee the ‘perpetual’ operation, the sensor node is supported by a hybrid power supply, which takes advantage of both wind and solar ambient energy sources to power the node and to charge the high capacity super capacitors that act as energy buffers. Using an electrochemical CO sensor, we secure the low power consumption of the node without degrading the sensing capabilities. We demonstrate our experience of operating the developed wireless sensor node in real conditions. Our solution can be applied for CO monitoring in urban areas and outdoor industrial facilities.