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Project: Wireless Sensor Network for Environmental Monitoring

Acronym: WSN_EM
Main Objective: The main goal of this project is to develop a wide range wireless sensor network (WSN) for temperature and humidity environmental monitoring capable of sending the information data to a internet server using a solar powered battery assisted GSM/GPRS module. Applications of this system will be environmental and precision agriculture monitoring, and also fire detection capability by tracking a sudden temperature raise. The main advantages of the proposed system when compared with existing commercial ones are: small size (2cm x 2cm) and low cost (less than 1€) sensor nodes (SN), large wireless communication range (2km), high SN battery autonomy (5-7 years) leading to low maintenance costs, and full independence of electrical supply lines. To our knowledge a WSN with all these characteristics is new and open new fields of application. To obtain the required WSN performance it is necessary that: i) The WSN topology has SNs deployed within the base station (BS) coverage area in the order of several square- kilometers. The star type network topology will be used, which means that each sensor communicates with the BS only. This option simplifies the network management and reduces the communication overall energy consumption. The proprietary communication protocol to be used is based on Bluetooth Low Energy (BLE) standard but much simpler and optimized for this WSN particular case. ii) The SN will have a single chip CMOS 0.13um integrated circuit (IC) developed by the proponents. The SN printed circuit board (PCB) will have a small size printed antenna, along with the mounted IC, a button cell battery and some surface mounted components. The IC to be developed basically contains a radio transceiver (TxRx), baseband analog and digital circuits, and temperature and humidity sensors. It communicates at 2.4GHz ISM (industrial, scientific and medical) frequency band, and uses ultra low power circuits with low leakage technology flavour to achieve an higher autonomy. This IC, also used in the BS, will be the breakthrough that allows the WSN pointed characteristics possible.
Reference: PTDC/EEI-EEE/30539/2017
Funding: FCT
Start Date: 01-09-2018
End Date: 31-08-2021
Team: João Manuel Torres Caldinhas Simões Vaz, Rafael Ferreira da Silva Caldeirinha, Marco António da Mota Carvalho Silva Pereira, João José Lopes da Costa Freire, José Teixeira de Sousa
Groups: Wireless Circuits – Lx, Antennas and Propagation – Lr
Partners: INESC-ID, MOREDATA - Sistemas de informação LDA
Local Coordinator: João Manuel Torres Caldinhas Simões Vaz
Associated Publications