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I turned an ESP32 into a Bluetooth presence sensor, and it knows which room I'm in

I'll never lose my phone again.
Hackaday

How To Use Those Cute But Slightly Odd 7-Segment LCDs

If you’re not aware, there is such a thing as adorable little three digit LCD 7-segment displays. They come in a ten-pin DIP ...
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[Arduino] Checking if the room light is on from the outside. Building a "Door-Through Lighting Indicator" that runs with auto-calibration and ultra-low power consumption

Have you ever been in a situation, whether in a conference room, a private office, or a room in your own home, where you can't tell if someone is inside (or if the light is on) from the outside ...