Robot grabber

Hi, I made a grabber for a robot some servo but nowI want that the robot can see an object and catch it with the grabber, what kind of sensors should I use to recognize the sensor ? (not when it is in the grapper but before)

I've seen that camera object recognition isn't the good solution for arduino...

Thanks for your help !

Madcreator

Use bright LED(s) and a Cadmium Sulphide (CdS) photocell mounted on gripper halves ... sweep the gripper around until the cell sees a bright spot (reflection) or a shadow ... works fine for snakes at night!