Computer Controlled Car using RF Data Transceiver

Can anyone help with my project? Pleas give me suggestions for this. Im pretty new with this project.

can i use this diagram? :roll_eyes:

By the way, my professor restricted me for using one arduino.

Yes, you can use that diagram if you have the USB-to-RS485 adapter and an RF transceiver that takes RS485 and communicates with a RF transceiver that works with the Arduino.