Uploaded June 2019 | Updated September 2026, 1 week ago

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Here's an idea for an escape room tech puzzle that's very easy to implement - you simply need:
- a working FM radio receiver
- an audio source (MP3 player, phone, computer, or Arduino, for example)
- a cheap "In-car FM radio transmitter" device

Players must tune the radio to the correct frequency (which they might have to derive from the numeric solution to a previous puzzle) to hear the recorded message being broadcast from the transmitter unit. This could be a looped recorded audio file, a Morse code message generated by an Arduino, or a message spoken by a gamesmaster used as a hint delivery system, say.

00:00 - 03:02 Introduction and Demonstration
03:03 - 03:43 Extending the puzzle - Morse code message
03:44 - 04:54 Wiring the FM Transmitter to an Arduino
04:55 - 15:20 Arduino code
15:21 - 16:11 Demonstration II
16:12 - 18:38 Wrapup/Summary

Accompanying resources and downloads for this and all my other escape room projects are available on my Patreon page: patreon.com/playfultech