result comes as random script

[aftonrobotics87]

I included the library person_sensor.h and ran the .ino test program provided, but the result on the serial monitor is this: ������
���@�������L��
��H�����3�
����
D{�����8��
��������3�
��J�
���3���I���
��b�������
��JB
N{�����(��
��H���H���
��
�����3������
���s��� ��
��J�����3���H���
��J�����3������
��B�����3

it continues writing infinitely and speeds up the writing when shown a face.

[SimonVonSchmude]

You have probably selected the wrong baud rate in your serial monitor. Try setting it to 9600, as this is the baud rate used in the example code.