Add sabertooth lib, start enabling all motor drive

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

@@ -0,0 +1,43 @@
+// Shared Line Sample for Packet Serial
+// Copyright (c) 2012 Dimension Engineering LLC
+// See license.txt for license details.
+
+#include <Sabertooth.h>
+
+// Up to 8 Sabertooth/SyRen motor drivers can share the same S1 line.
+// This sample uses three: address 128 and 129 on ST1[0] and ST1[2],
+// and address 130 on ST2.
+Sabertooth ST1[2] = { Sabertooth(128), Sabertooth(129) };
+Sabertooth ST2(130);
+
+void setup()
+{
+  SabertoothTXPinSerial.begin(9600);
+  Sabertooth::autobaud(SabertoothTXPinSerial); // Autobaud is for the whole serial line -- you don't need to do
+                                               // it for each individual motor driver. This is the version of
+                                               // the autobaud command that is not tied to a particular
+                                               // Sabertooth object.
+                                               // See the examples in 1.Basics for information on whether you
+                                               // need this line at all.
+}
+
+void loop()
+{
+  // ST1[0] (address 128) has power 50 (of 127 max) on M1,
+  // ST1[1] (address 129) has power 60 (of 127 max) on M2, and
+  // ST2    (address 130) we'll do tank-style and have it drive 20 and turn right 50.
+  // Do this for 5 seconds.
+  ST1[0].motor(1, 50);
+  ST1[1].motor(2, 60);
+  ST2.drive(20);
+  ST2.turn(50);
+  delay(5000);
+  
+  // And now let's stop for 5 seconds, except address 130 -- we'll let it stop and turn left...
+  ST1[0].motor(1, 0);
+  ST1[1].motor(2, 0);
+  ST2.drive(0);
+  ST2.turn(-40);  
+  delay(5000);
+}
+