I'm making a robotic dog. I want it to bark, follow you via beacon in your hand and ultrasonic sensors like eyes and can be controlled via bluetooth/wifi. Which should I choose for control : Arduino or Raspberry Pi? It will have at least 5 servos, so I think I will need two motor controller boards.I don’t have much money, so I must find something inexpensive and I don’t know which alternative of controller will be cheaper. I know basics of C++ but don’t know Python. Sorry for my English , I'm not from US/UK