Using the Eduroam service, you can connect to Aston University’s wireless network if you’re a student at another University.
More details can be found here: http://www.aston.ac.uk/ict/staffguide/network/wireless/eduroam/
If you're not a student at another University, then you can request a wifi password from the Help Point, Monday - Friday 09:00 - 18:00.