Interfacing with piggy bank

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finished hackvision clone built.
now project.....
i want build piggy bank thats nothing pig, cube box actually. may have these qualities :
store coins (ofcourse)
have 7 segment display show if full, half or empty. ex. f full, h half, , e empty.
got free atmega8 want interface ?
any ideas how make possible. don't have pressure sensors(don't have money buy right now) have infrared leds, infrared detector , ldrs(if make sense here). please help.
and 1 thing more, can 12mhz crystal used atmega8l.

thankyou..!

determining if it's full, empty, etc... not easy accurately.

one way comes mind using load cell on box. give indication of how full pig is.

assuming coins going have same or close enough density allow accurate.


Arduino Forum > Using Arduino > Project Guidance > Interfacing with piggy bank


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