added ultrasonic code, replaced orion with mcore library

ultrasonicSensor/ultrasonicSensor.ino

@@ -0,0 +1,43 @@
+#include <MeMCore.h>
+
+
+
+MeDCMotor motorL(M1); //positive go backward
+
+MeDCMotor motorR(M2); //positive go forward
+
+MeUltrasonicSensor ultraSensor(PORT_3);
+
+uint8_t motorSpeed = 100;
+
+void setup()
+{
+  Serial.begin(9600);
+}
+
+void loop()
+{
+
+  Serial.print("Distance : ");
+  Serial.print(ultraSensor.distanceCm() );
+  Serial.println(" cm");
+  delay(100);
+  
+  /*motorL.run(motorSpeed); // value: between -255 and 255. 
+  /motorR.run(motorSpeed); // value: between -255 and 255. 
+
+  delay(2000);
+  motorL.stop();
+  motorR.stop();
+
+  delay(100);
+  motorL.run(-motorSpeed);
+  motorR.run(-motorSpeed);
+
+  delay(2000);
+  motorL.stop();
+  motorR.stop();
+
+  delay(2000);
+  */
+}