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why you have used so much expensive and different electronic parts and boards ?
The usb to servo bridge, the camera module, raspbery etc. its all waste of money

you need only a old smart phone like samsung s3 or else and a ESP8266 12E for about 5-8€ from ebay
the smart phone take the pictures and runes the software for solving
and send the movement by Wlan to the esp8266
the servos can plugged directly at the esp module
thats could be all
sad that you not have such a easy electronic solution, because the mechanical construction of the machine is nice