On the offhand chance you want to be able to measure just how far away folks are from you, CMoz has a project for that. Over on Instructables, CMoz has outlined a project called the Distance Hat. Just like it says on the tin, the hat measures distance via a distance sensor and a NeoPixel Ring. Here’s more:
In this tutorial, for a distance sensor hat, I’ll be using an ultrasonic sensor to measure the distance of others approaching. This will trigger a neopixel ring with colours, a buzzer for sound, and a vibration sensor to get some haptic feedback.
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