Power Consumption Optimization of a Wireless Temperature Sensor Node Using Unidirectional Communication Wireless sensor networks (WSNs) are gaining increasing popularity in industry. Success of these systems depends on two very important factors: power efficiency of the sensor nodes and communication reliability. In this paper, we investigate the effect of using unidirectional (broadcasting) communication on the power consumption and reliability of a wireless sensor node. A highprecision wireless temperature sensor reported in an earlier publication is employed as a case study. First, we calculate the energy required to transmit and receive a message using Bluetooth low energy (BLE) in the physical layer without taking any reliability precautions. Then, we estimate the amount of energy required for the reliable transmission of a BLE packet using the BLE acknowledgment method and forward error correction (FEC) in the application layer. Through this paper, we show that the power consumption of a wireless temperature sensor can be reduced using broadcast communication and simultaneous forward error correction while providing enough reliability in short ranges.

An Energy Efficient WSN Implementation for Monitoring and Critical Event Detection Wireless sensor network (WSN) has been recently used in several applications and scenarios, among which is environmental monitoring and critical event detection within a specific area of interests (AoI). However, to have an efficient and reliable network implementation, it is important to optimize the WSN motes to prolong the network lifetime. In this paper, an energyefficient implementation for WSN is presented that utilizes deepsleep powersaving mode in order to optimize the energy consumption while maintaining a reliable sensing and monitoring operation. Experimental performance evaluations that both consider sensing and wireless data transmission were conducted, which showed the effectiveness of the proposed WSN implementation. Furthermore, the effect of applying the advanced encryption standard (AES) on the nodesxe2x80x99 energy levels is experimentally tested and compared with the case without encryption.