how can i connect raspberry pi & arduino.

Question

i want to make a driverless car and want to use rpi as computer & arduino as microcontroller how should i approach it.

Answer 1

Connect through usb and use serial communication (pyserial)
http://www.doctormonk.com/2012/04/raspberry-pi-and-arduino.html?m=1
you'll save on extra modules and voltage level shifters

Answer 2

set one of them up as a server then connect them with an Ethernet cable. not the best solution but now you don't need to have internet to connect them. you could also use 2 Bluetooth dongles and a just install a Bluetooth application on each one