Lesson 12 -  Distance sensor 

Understanding the while loop - 

"while 1 = 1"  will always be true.

using the while block like this is the same as using a forever block.

in most scrip languages there is no forever command, so coders will use a line of code like this,

while ( 1 = 1)

 or command might just be "while true" like this 

while (true)

LEARNING ACTIVITY

In this program the the first while block should make the code run forever.

  the second while block or the indented block 

should only happen when there is something 

in front of the distance sensor.  

Try this code and see how it works.

Move a target block around in front of the robot.

NOTE the arm in the down position sometimes will be "seen" by the sensor so if you get strange "readings" you can lift the arm out of the way. 

(hint - Lesson 5 - using the arm)

The distance sensor can also use math operators like this to compare numbers. Make this code and test it.