11/18
Order parts.
Find a right range of height of bath water.
Find a right range of IR sensor output value.
Make leds turn on and off on different ranges of height that matches bath in air.
Make leds turn on and off on different heights of water in bath.
11/25
Make recorder play different sounds on ranges of height that matches bath in air.
Make recorder play different sounds on different heights of water in bath.
Make the circuit working in the air.
Make the circuit working in bath with water.
12/02
Make the circuit into a smaller size.
Get a proper sized rubber duck that can fits the circuit and battery.
Put circuit and battery into the duck.
Test it in bath with water.
12/09
User test.
Modify it.
Document it.
12/16
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