Add sabertooth lib, start enabling all motor drive

lib/Sabertooth/examples/3.Advanced/SoftwareSerial/SoftwareSerial.ino

@@ -0,0 +1,35 @@
+// Software Serial Sample for Packet Serial
+// Copyright (c) 2012 Dimension Engineering LLC
+// See license.txt for license details.
+
+#include <SoftwareSerial.h>
+#include <Sabertooth.h>
+
+SoftwareSerial SWSerial(NOT_A_PIN, 11); // RX on no pin (unused), TX on pin 11 (to S1).
+Sabertooth ST(128, SWSerial); // Address 128, and use SWSerial as the serial port.
+
+void setup()
+{
+  SWSerial.begin(9600);
+  ST.autobaud();
+}
+
+void loop()
+{
+  int power;
+  
+  // Ramp from -127 to 127 (full reverse to full forward), waiting 20 ms (1/50th of a second) per value.
+  for (power = -127; power <= 127; power ++)
+  {
+    ST.motor(1, power);
+    delay(20);
+  }
+  
+  // Now go back the way we came.
+  for (power = 127; power >= -127; power --)
+  {
+    ST.motor(1, power);
+    delay(20);
+  }
+}
+