Hidden treasures abound in the Adafruit store... and this is one. A little radio module with four pins that can be controlled from a battery powered key fob.

We will use those four pins to control the direction of each servo: forward, backward, left, and right.

Connect the pins of the radio module to the Arduino as follows.

• GND -> GND
  
• +5V --> 5v
  
• D0 ----> A0
  
• D1 ----> A1
  
• D2 ----> A2
  
• D3 ----> A3
  

If your robot keeps resetting or the radio doesn't seem to be working... voltage could be sagging below 5 volts - the radio module doesn't operate reliably below that threshold.