Oh. Beacons? Yes, beacons!
Beacons are low power, low cost Bluetooth LE devices that can be used for a very simple job: to advertise a URL to users running an app on their mobile device within range of the device!
Technically, beacons can also be used for a few different scenarios where a localized, wireless data broadcast is desirable, such as indoor location tracking, point of sales/marketing, and experience personalization.
We'll create two version -- first, a simple beacon that can run on any CircuitPython capable nRF52840 board. Second, a custom version for the CLUE board that also shows QR codes and allows you to scroll among multiple beacon URL choices to advertise!
You'll also want a USB cable for programming it and power, or you can use a LiPoly battery for remote powering.