The mother is constructed in a similar way as in P3. We attach an accelerometer, IR photoreflector and buzzer.
Accelerometer is used to guide the little girl to the robot, and when the IR photoreflector detects the little girl, it stops, the red LED goes out, the white Led lights up and makes a buzzer sound.
The hand of the little girl is fixed to a geared-gear-gear mechanism moved by a DC motor, a servo motor is mounted in the plate.
Luise holds the plate in her hand, lowers the plate onto the DC motor geared rack on the sound sensor and the servomotor causes the plate to open as if it were to break in two.
Meanwhile, her head turns from Lotte to Luise, as in P3.