Lesson4Week6.markdown

@@ -148,6 +148,10 @@ public class PIDCarController {
 	int derivative = 0;
 	int error = 0;
 	int turn;
+
+        // Calibrate the black/white threshold
+        sensor.calibrate();
+	offset = sensor.blackWhiteThreshold();
 	 
         LCD.clear();
         LCD.drawString("Light: ", 0, 2);