Watermelon ripeness detector

Can be made into a smartphone app.

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:

1. Microphone
2. FFT and filtering on the Arduino
3. Ripe and unripe watermelons

increase fan rpm with temperature