Abstract
Underwater sensor wireless networks are increasing in interest for
seabed and water column monitoring. However, due to the fact of lacking for a
predictable energy-harvesting source the life time battery constrain reveals the
importance of looking for low-power consumption development platforms to
implement underwater sensor networks. This paper presents a study on consumption,
wake up timing and performance of an ARM Cortex M4 in different
low power mode. The STM32F4 discovery board has been selected as commercial
platform for a prototype design of a multihop communication system. The
implementation integrates FreeRTOS, SRAM and micro SD storage.The system
is intended to the capability of transmitting data from underwater sensor nodes
along a deployed lined topology. Communication is done through ARM Cortex
UART ports, linked with the S1000 ITACA modem with acoustic capability.
Thus, a specific API has been designed to couple both systems. Data are finally
received in a pc host sink through Ethernet connection
