Vape detector for Vilnius Lyceum hackathon

During high-school years, me and my friends who at the time attended robotics classes with me entered Vilnius Lyceum hackathon. We were tasked to create an innovative solution for schools. But we were not going to make it boring - we made a vape detector for school toilets using what we had: cardboard, MicroBit, humidity sensor and some pieces of electronics. The interesting part was to make a device based on some simple principles that we had to research completely on our own. We were awarded 4th place, but were told that we would have won if not somewhat unpopular nature of our idea with award givers.