This device connects via WiFi. It uses SNMP to collect traffic data from therouter. It can display any SNMP data, I have it setup to display total networkusage, it might be able to display single device if the router tracks that infoin its SNMP data. If you are looking into this project, make sure your router can supportSNMP.
DIY WiFi Controlled Tiny Plane <15$
Ya. I was thinking about a project like this for about 2 years before I got the parts together and tried to really make it happen.
3D Design Class
Internet Speed Gauge
Internet Speed GaugeView Instructable »