I tried to make a social distancing detector from a microbit. Disclaimer: this was only for microbit to microbit usage. If it was used in the real world where not all people have a microbit, this will not work. The basic plan was for it to show a happy face if we were more than six feet away from each other, but if we were less, it would show a sad face. Here is a photo of my code:

And this code did not work very well. It would flip back and forth once we started moving. This was because the transmit power was too low. The signal was so weak that whenever we moved the signal would get finicky and move around. So this did not work very well.