Add sabertooth lib, start enabling all motor drive

lib/Sabertooth/examples/2.Settings/Persistent/Ramping/Ramping.ino

@@ -0,0 +1,39 @@
+// Set Ramping Sample for Packet Serial
+// Copyright (c) 2012 Dimension Engineering LLC
+// See license.txt for license details.
+
+// WARNING: This sample makes changes that will persist between restarts AND in all modes.
+#include <Sabertooth.h>
+
+Sabertooth ST(128);
+
+void setup()
+{
+  SabertoothTXPinSerial.begin(9600);
+  ST.autobaud();
+  
+  // See the Sabertooth 2x60 documentation for information on ramping values.
+  // There are three ranges: 1-10 (Fast), 11-20 (Slow), and 21-80 (Intermediate).
+  // The ramping value 14 used here sets a ramp time of 4 seconds for full
+  // forward-to-full reverse.
+  //
+  // 0 turns off ramping. Turning off ramping requires a power cycle.
+  //
+  // WARNING: The Sabertooth remembers this command between restarts AND in all modes.
+  // To change your Sabertooth back to its default, call ST.setRamping(0)
+  ST.setRamping(14);
+}
+
+void loop()
+{
+  // Full forward, both motors.
+  ST.motor(1, 127);
+  ST.motor(2, 127);
+  delay(5000);
+  
+  // Full reverse
+  ST.motor(1, -127);
+  ST.motor(2, -127);
+  delay(5000);
+}
+