This module has been designed for face detect, therefore good image of face is important
for successful detection. Below are some hints for playing.
a. Detection distance is set at about 50cm to 100cm.
b. Strong backlight or too dark environment is not good for detection.
c. Always place module at the level of people’s head
d. Sometimes it will happened false detect, that is a trade off.
e. Power can be lithium battery or alkaline AAx4. Suggest to use DC5V for long time