The Foursquare Clock
This is a foursquare location clock designed and created by Christopher McKirgan, www.kirgy.co.uk.
The Foursquare Clock was created for Foursquare day 2012. It shows the current checkin location based on a list of either venue categories (i,e. shops) or specifically locations (i.e. home venues).
The clock runs off an arduino with stacked ethernet shield running a simple webserver. This connects to an external linux server running a cronjob to execute a file which does all the work with foursquare API and databases.