Loadsensing is a wireless system that allows the monitoring of large structures, with the aim to detect and prevent possible risks and to ensure an optimal use. The system collects data from a wireless sensors network and sends it to a database, triggering alarms when necessary. It was installed to monitor the Olympic Arena Palau Sant Jordi, in Barcelona. The solution allowed engineers to know in real time the weight and stress supported by every beam, so every event can be developed optimally without being exposed to any risk. The solution is also being used to monitor buildings, bridges, tunnels and loading harbours.