2 files changed, 27 insertions, 4 deletions
diff --git a/robot/problems/introduction/countlines/common.py b/robot/problems/introduction/countlines/common.py
index 6d2bf13..bf5343b 100644
--- a/robot/problems/introduction/countlines/common.py
+++ b/robot/problems/introduction/countlines/common.py
@@ -21,17 +21,17 @@ robot.connect_sensor( 'color' )
 
 robot.move_steering( 'on' )
 start = time.time()
-stevec = 0
+counter = 0
 color = -1
 while time.time()-start < 1.2:
     c = robot.color_sensor_measure( 'color' ) # values: 0-7 see the scale above
     if c!=color:
         if c!=6 and c!=0:
-            stevec += 1
+            counter += 1
         color = c
 robot.move_steering( 'off' )
 
-print( "Stevilo crt:", stevec )
+print( "Number of lines:", counter )
 '''
 
 hint_type = {
diff --git a/robot/problems/introduction/countlines/en.py b/robot/problems/introduction/countlines/en.py
index 8b3b275..009a752 100644
--- a/robot/problems/introduction/countlines/en.py
+++ b/robot/problems/introduction/countlines/en.py
@@ -7,8 +7,31 @@ name = 'Count lines'
 slug = 'Count lines'
 
 description = '''\
+              Write a program to count the color lines on white background using the robot with a color sensor. The robot should drive forward, crossing the lines and count them.
 '''
 
 hint = {
-    
+    'mW_init':mod.hint['init'],
+    'connectMotorLeft':mod.hint['connectMotorLeft'],
+    'connectMotorRight':mod.hint['connectMotorRight'],
+    'moveSteeringOn':mod.hint['moveSteering']+['''<p>Use move_steering method with 'on' as the first parameter <code>robot.move_steering( 'on',... )</code>.</p>'''],
+    'moveSteeringOff':mod.hint['moveSteeringOff'],
+    'connectColorSensor':mod.hint['connectColorSensor'],
+    'colorSensorMeasure':mod.hint['colorSensorMeasure'],
+    'while':['''<p>Use the while loop: inside, the robot should read the current color and increase the counter when the color changes.</p>''',
+             '''<p>Interrupt the loop after a certain amount of time; determine the time the robot needs to drive over all the colors experimentally; use <code>time.time()</code>.</p>''',
+             '''<p><code>while time.time()-start < 1.5:</code>.</p>'''],
 }
+
+plan = ['''\
+<p>The program should:</p>
+<ol>
+  <li>create a mindstorms_widgets() object, which represents the robot in your code.</li>
+  <li>connect the driving motors.</li>
+  <li>connect the color sensor.</li>
+  <li>synchronize the motors and run them so that the robot would move forward.</li>
+  <li>inside the loop, let the robot recognize colors and increase the counter.</li>
+  <li>interrupt the loop after a certain amount of time.</li>
+  <li>stop the motors.</li>
+</ol>'''
+]