Turn on music as soon as you walk into a room! This tutorial covers a minimalistic entrance sensor that triggers music of your choice. The design can easily be adapted to suit a variety of needs (e.g. alarm system, motion-triggered lights, etc.).
The system is controlled by a Raspberry Pi, and aside from the RPi and speakers, the materials cost is extremely low (~ $20). Build time is approximately 1 – 2 hours.
For an inexpensive set of speakers, check thrift stores and/or friends’ garages.
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