whiskeytangohotel.com has build a internet monitoring device based on Raspberry Pi:
It is a pretty commonly uttered question (sometimes loudly) around the home or office; “Is the internet up?” As the goto IT Support Manager around the house this can get a little tiresome. Most of the time the internet is up and it’s a user or personal device problem that can be solved with a re-boot, re-load, re-etc. Sometimes the internet is really down requiring a router and cable modem reboot or a call to the ISP. Wouldn’t a simple visual check that anyone could quickly understand be helpful? Plus, as a bonus, provide some general network health statistics with a screen print and an hourly update to a Google Drive spreadsheet.
Raspberry PI answers, “Is the internet up?” – [Link]