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The problem we want to solve :
1.The trash in the garbage can't be pressed to minimize its volume, so it would take up too much space in the trashcan.
2.Street cleaners can’t directly see the situation in the garbage can.
When the pedal doesn’t be trampled, the input port is closed and there is a plank pressing the trash.
When the pedal is trampled, the input port is opened and the plank is raised up.
After using, the plank forces down again and the trash is squashed.
The street cleaners can see the height of plank to know the situation in the garbage can.