When I ask for input for one reason or another from a human I use
this script to check before I have my robot speak
It returns a $Face_Found=1 (YES) if it finds a human after about 5-10 seconds.


# ----------------------------------------------|
# Visual Confirmation of Human Presence |
# ----------------------------------------------|

Print ("+-----------------------------+")
Print ("| Checking for human presence |")
Print ("+-----------------------------+")


# Initialise Variables
$CameralsTracking=0
$count_down=20000
ControlCommand("Camera", CameraFaceTracking)

# Start the sequence
Print("Scanning for faces....")
ControlCommand("Camera", CameraFaceTrackingEnable)
:Find_face
$count_down=$count_down-1
$Face_found=$CameraIsTracking
# Print("Scan $count_down")
IF ($count_down<=0)
Print ("No faces visible!")
Goto (Face_Check_Complete)
ELSEIF ($Face_found=0)
goto (Find_Face)
ELSEIF ($Face_found=1)
Print("Face located...")
ControlCommand("Camera", CameraSnapshot)
Print("Image recorded.")
Goto (Face_Check_Complete)
ENDIF

:Face_Check_Complete
Print ("Scan completed!")

ControlCommand("Camera", CameraFaceTrackingDisable)
halt()