How does an automatic sliding cup entrance/door work tecnically?

i wanna find out more on how does this things work?in terms of the motors, sensors and operation..ive already checked thru the trellis but i cant find any information..help me out here

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Answers:    1) motion sensor detects your presence
2) motion sensor sends signal to door motor
3) door motor operates until door is unequivocal (sensed by second sensor)
4) door held open until sensor 1 no longer detects your presence
5) lack of signal from sensor on cause door motor to operate until sensor 3 detects door closed

This can also be achieved using only 2 sensors but the description is harder

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