In this project I am using a PC to send commands to an Arduino based Robot. The transmitter consists of an RF 433 MHz Transmitter module connected to an Arduino Uno / Pro mini / Nano / Mega.The Transmitter Arduino is connected to a laptop/PC via a USB cable for Serial Communication. In our case the Receiver Arduino is a being used to control a Differential Drive Robot. The Receiver Arduino is mounted with an RF 433MHz Receiver Module.

• To Execute the Python Script we need to install Pygame library.
• You need pip(package installer for python) to install pygame library.
• If you don't have pip installed in your system, install pip from here.
• run command in terminal or cmd pip install pygame or sudo pip install pygame.
• to run the script run the command in terminal or cmd python Python_script_transmitter.py.

• The arduino remains connected via USB cable to the laptop/PC running the python script at all times.
• connect +5v terminal of arduino to the Vcc terminal of RF_TX(transmitter) module.
• connect Gnd terminal of arduino to the Gnd Terminal of RF_TX(transmitter) module.
• connect D11 terminal of arduino to the Data terminal of RF_TX(transmitter) module.
• connect the antenna terminal of RF_TX(transmitter) module to an Antenna.(this connection is OPTIONAL)
• The connections are illustrated in the Transmitter wiring diagram.png.

• The receiver arduino is standalone, so it is powered by an external 9V battery.
• connect +5v terminal of arduino to the Vcc terminal of the RF_RX(receiver) module.
• connect Gnd terminal of the arduino to the Gnd terminal of the RF_RX(receiver) module.
• connect the D11 terminal of the arduino to the Data terminal of the RF_RX(receiver) module.
• connect the antenna terminal of RF_RX(receiver) to an Antenna.(this connection is OPTIONAL)
• connections for the Motor Driver
  • connect the D2 terminal of the arduino to Motor 1 A terminal of Motor Driver.
  • connect the D3 terminal of the arduino to Motor 1 B terminal of Motor Driver.
  • connect the D4 terminal of the arduino to Motor 2 A terminal of Motor Driver.
  • connect the D5 terminal of the arduino to Motor 2 B terminal of Motor Driver.
  • connect the Motor Driver ext_supply terminal to +9V terminal of the battery.
  • connect the Motor Driver Gnd terminal to the Gnd terminal of the battery.
• connections are well illustrated in the Receiver wiring diagram.png.

• We need to install Radiohead library for arduino to run the arduino sketches.
• Download Radiohead Library from here.
• Extract the zip file and move the 'Radiohead' folder to Documents/Arduino/Libraries folder.