trigram

Story

Social distancing is often hard to quantify. This project is to provide a tracker that helps you understand how well you're socially distancing, using a mobile app and bluetooth hardware.

Theory

The bluetooth specification provides specs that can be used to guess distance. We can tune the transmit power of the NRF52840 radio to set a boundary that the NRF52840 can read scan request packets.

If a scan request packet is read, then it's clear there should be a device within the boundary. Furthermore, depending on the density of scan requests from different bluetooth devices, the user can understand that there is a device approaching or leaving the user and the user can correspondingly adjust how they socially distance.