In a pandemic fighting spirit we had an idea to create a UV sanitising device for elevators - its principle of work was really simple the controller should turn on the lump when the people are not inside and when the elevator is not running. For this we used a PIR motion detector and 3axis gyro/accelerometer IC connected to a atmega328p. I used "we" in here because I was mainly responsible for hardware design of a prototype. It was all made in a start-up spirit - from an idea to a prototype in few weeks, so my work buddy used an arduino core for programming (I would use some STM instead not that old thing 😄). As usual hardware design files from this project are available on my CircuitMaker page 😉.