Ø Data wires can be expanded or contracted by clicking on the bottom left-hand corner of the icon

Ø Data wires functions for the light, move, ultra sonic touch and sound blocks. Data hub functions listed top to bottom

Examples

Ø Example Program 1

A yellow wire carries the light intensity reading (numeric data) from the sensor block to the math block (covered below).  The second wire (green) carries a logical signal from the math block to the move block. The signal control the direciton in which the motors run.

Ø Example Program 2 - Annotated

Example 3: Loop Counter

Ø Variables - a variable block and its configuration pane are shown below

Ø Arithmetic Operators (see text)

       ·  As might be expected from their name, these operators perform arithmetic operations on numeric values, including values stored in variable blocks.

      ·  Four operations are provided - sometimes referred to as the "four rules".

      ·  These operations are: add, subtract, multiply, and divide. All of these are performed by the Math block.

      ·  When dividing, the operation loses the digits after the decimal point. This can be avoided by writing additional routines

Ø Logical Operators (see text)

      ·  Operations on logical variables comprise NOT, AND, OR.

      ·  These operations are performed by a Logic Block.

Ø Flag Variables (see text)

      ·  Often we assign a logical variable to act as a flag.

      ·  The variable has the default value False, but is set to True when a specified event occurs.

      ·  For example, a flag variable named intensity can be set to True when the light sensor detects a light intensity greater that a specified value.

Ø Math Block

Ports: top to bottom

The math block performs simple arithmetic operations such as add, subtract, multiply and divide. The input numbers can be typed or supplied dynamically by data wires.