“Arduino is an open-source electronics prototyping platform based on flexible, easy-to-use hardware and software.” And we will use it to build custom gps tracking devices that will record your position in combination with lots of other data like light, sound and basically anything you can think of. These custom devices are meant for experimental mapping exercises like those that will be carried out during the CSI.Lagos workshop organized by Urban Detectives in April 2010. Once developed the blueprints will be published as well as a tutorial on the Active IDs wiki.