He only used them on himself, but quickly he could record the websites he’d visit while using public WiFi. With this came the realization that he could find a wealth of information, such as his email address and his photo, simply by monitoring this Internet activity.

Raspberry Pi has given the DIY-er the power to create some cool tech, such as this talking microwave. But it also has the power to create devices that fall on the darker side of things. O’Connor, a security researcher, simply took a tiny Raspberry Pi Model A computer and a few over-the-counter sensors and placed this into a small plastic box, one that could easily be placed anywhere throughout a city.

He could even “spy” on himself if he wasn’t online, through Wi-Fi “pings.” The device, which he calls “creepyDOL,” could inconspicuously be placed in a strategic location around a city. How long before someone would notice?