WSN in Prague metro Martin Vaníček - CTU WSN installation in Prague - past • Test site Near Dejvická metro station (~70m) • The reason for this site was to test the WSN network in the environment of Prague metro, especially as on line A is installed a signalling system running on the Wi-Fi band as Zig-bee • 8 wireless nodes + Stargate gateway installed • 5 nodes + Stargate in one ring • 3 nodes along tunnel ~ 17m distance • Linksys GPRS router for internet access next to Stargate • Encountered problems • GPRS connection dropping, most probably due to the distance from the station • Stargate stopped working due to faulty power supply, the WSN removed during January visit WSN in Prague Metro Prague 4 - 5 November 2008 Martin Vaníček WSN installation in Prague - present • Situation at line C between Nádraží Holešovice and Vltavská stations: • WSN is installed in similar set up as in London • The gateway used is Balloon computer & MIB600 board • Internet – using USB modem connected to Balloon • The signal is strong enough as we are closer to the station • The systém is working fine since August this year • Peter Bennet will give you more details in his presentation WSN in Prague Metro Prague 4 - 5 November 2008 Martin Vaníček WSN installation in Prague – future • Proposal: • WSN will be installed in 2 more locations in Prague metro – near station Můstek on line A and on Nuselský bridge on line C • WSN will be based on Crossbow‘s implementation (Stargate Netbridge gateway with X-mesh protocol) the collection of data from network will be based on Cambridge implementation as is on Balloon • Internet connection will be done using Linksys router • Netbridge gateway will be connected with MIB600 board via about 100m long Ethernet cable that is proved to work in metro on line C, we will try to implement powering of MIB 600 by PoE • Regarding sensors we want to install 4 inclinometers and 2 crackmeters on each site of course together with measurements of temperature, pressure and humidity. WSN in Prague Metro Prague 4 - 5 November 2008 Martin Vaníček Thank you for your attention.