Optimizing Power Consumption of Wi-Fi for IoT Devices: An MSP430 processor and an ESP-03 chip provide a power-efficient solution

Abstract

The Internet of Things (IoT)-connection of small smart sensors, actuators and other devices to the Internet-is a key concept within the smart home. To ease deployment, such devices are often wireless and battery powered. An important question is the wireless interface used. The ubiquity of Wi-Fi in homes today makes this an attractive option, but the relatively high power requirements of Wi-Fi conflict with the requirement for long battery life and low maintenance. Lower power alternatives, such as Bluetooth and Zigbee, have been proposed, but these have a much smaller installed base. In addition, many Smart Home products are currently available using 433MHz technology. This paper considers whether it is possible to reduce Wi-Fi power usage to the point where cheap Wi-Fi based products can be used instead of other protocols. The paper undertakes power analysis of a wireless sensor with an SoC Wi-Fi module, with and without a separate microcontroller optimised for low power usage which can be used to switch the Wi-Fi module on and off. This paper is an extension of previous work comparing Wi-Fi and 433MHz devices, and so we compare 433MHz to the optimised Wi-Fi sensor. Finally, the paper considers the energy usage of DHCP, demonstrating that further energy savings can be made if the application handles IP addressing and presents a static IP address to the Wi-Fi module.

Design and Implementation of Asynchronous Processor on FPGA

“…MSP430 is a 16-bit low-power processor for sensing and measurement applications [21] - [23]. To design an MSP430 in an asynchronous circuit design methodology on FPGAs, we apply the design techniques addressed in Section III.…”

Linear-Polarization-Insensitive Rectenna Design for Ground-to-Air Microwave Power Transmission

“…Additionally, to develop more practical DLP rectenna according to the microwave power distribution scheme shown in Fig. 2b, two sub-rectifiers with lumped matchings are employed for the compact rectenna realization, which leaves spaces for further implementation of a power management or some other functional electronics, e.g., a microcontroller unit (MCU) [14] and a dc-to-dc bulk converter [15]. Moreover, the aperture-coupled mechanism [16][17][18] is introduced to design the shared-aperture DLP antenna, which isolates the feeding layer and radiating patch by an air gap without any mutual interaction.…”

Power consumption analysis on an IoT network based on wemos: a case study

“…3) in terms of power consumption and the results from the tests highlight that ESP-03 when it combined with MSP430 consume less energy instead of working separately. Moreover, this survey conducted without using any specific IoT protocol [2]. Mocnej et al also conducted a research on energy consumption at ESP8266 in terms of overhead.…”