Geo-fence

In this adventure you have built the hardware and software for a fully functional passenger lift, just like the lifts inside real buildings. By doing this, you have used many of the skills you learnt by working through all of the adventures in this book, including sensing the players' position, geo-fencing the lift shaft, moving the player, building blocks automatically, sensing when a block has been hit, interfacing with electronic circuits, using Python lists, developing and testing a program one step at a time, and many more amazing things!

In this case, you could use the GPS to "geo-fence" the area, and implement access control measures that track where devices are located within the facility, alerting you when mobile devices enter unapproved areas.