We had initial issues with the fans. The ones we chose simply couldn't spin fast enough to generate enough wind for bubbles. As such, we ended up experimenting with a bunch of fans around the iDeATe Lab, and also added in external power for it (final fan image below). In the end, we used a propellor based one for one, powered externally. We also chose to leave the fan switched on permanently, rather than regulating it through the breaths.
We originally tried using humidity sensors to detect breaths. This sensor was, however, too fickle to give accurate readings. We ran into similar issues with using a temperature sensor. Instead, we implemented a flap covered with conductive tape which completes a circuit when blown on. The added benefit of this was that it provided a visual cue of the breath - the circuit physically changing due to the user.
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