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Adding picture of 4WD
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|+== FourWD_js_usonic README ==|
|+=== Hardware ===|
|+* Four Wheel Drive (4WD) car by DFRobot (I think at least. I got it at Makershed.)|
|+* 2-Axis Joystick. I am using the Parallax part sold by Radio Shack.|
|+* Ultrasonic sensor HC-SR04. I got mine for cheap from China (about 3.50 USD).|
|+=== Operation ===|
|+* Joystick has 7 positions, forward left, forward, forward right, back left, back, back right and stop. To stop let the joystick return to center.|
|+* Ultrasonic sensor should stop the robot within 12 inches of the obstacle.|