Correlation between sound decay rate or fundamental frequency/amplitude and ripeness.
Melon Meter
https://www.youtube.com/watch?v=LxC67dnyVGU
ppt: http://www.me.udel.edu/meeg447/98/serffiles/fall4-design-reviews/dr-ppt/dr-02.ppt
http://www.researchgate.net/publication/257798409_An_intelligent_procedure_for_watermelon_ripeness_detection_based_on_vibration_signals
Equipment:
- Microphone
- FFT and filtering on the Arduino
- Ripe and unripe watermelons
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