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Sound Detector Evaluation (Success) - last sensor!

A project log for Peril-Sensitive Sunglasses

A version of the Peril-Sensitive Sunglasses (as described by Douglas Adams in The Hitchhiker's Guide to the Galaxy)

Minimum Effective DoseMinimum Effective Dose 04/13/2014 at 08:530 Comments

The last sensor to work in is the Sound Detector Board.  I am using the ENVELOPE output, which is an analog representation of the volume of detected sound.

I haven't actually given it a proper run-through yet but I'm confident it will work just fine.

The ADC reads about 20-30 in normal quiet workshop conditions.

Clattering a tool near the sensor on the bench shoots it up to about 100+.  Loudly clattering the tool intentionally can easily spike 150+.

I don't see any reason the same treatment for other sensors won't work - regularly read values into a ring buffer and calculate a dynamic threshold to use based on the standard deviation of readings.  Slower, more gradual changes will be ignored but sudden changes will trigger the Peril-detection part of the code.

This is the last sensor to fiddle with; I think the sensor suite is complete now with:

Peril will detected either reactively or pre-emptively based on the readings from these sensors.

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