Init commit with many years of arduino sketches and projects. I dont know if the esp8266 includes much, but there are also libraries. I hope they dont have crazy automatic versioning through the Arduino IDE.

Projects/ProgLab/LineFollower/LineFollower.ino

@@ -0,0 +1,53 @@
+#include <PLab_ZumoMotors.h>
+#include <Pushbutton.h>
+#include <QTRSensors.h>
+#include <ZumoBuzzer.h>
+#include <ZumoMotors.h>
+#include <ZumoReflectanceSensorArray.h>
+
+#define driveSpeed     150
+#define lightThreshold  800
+
+ZumoMotors motors;
+Pushbutton button(ZUMO_BUTTON);
+unsigned int sensorValues[6];
+ZumoReflectanceSensorArray reflectanceSensors;
+
+void setup()
+{
+   reflectanceSensors.init();
+   motors.setSpeeds(0,0);
+   button.waitForButton();
+}
+
+void findLine()
+{
+   reflectanceSensors.read(sensorValues);
+   if (sensorValues[0] > lightThreshold)
+   {
+      turnLeft();
+   }
+   else if (sensorValues[5] > lightThreshold)
+   {
+      turnRight();
+   }
+}
+
+void turnLeft()
+{
+   motors.setSpeeds(-driveSpeed, -300);
+   delay(400);
+}
+void turnRight()
+{
+   motors.setSpeeds(-300, -driveSpeed);
+   delay(400);
+}
+
+void loop()
+{
+   findLine();
+   motors.setSpeeds(driveSpeed, driveSpeed);
+}
+
+