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Flowcharts

Flowcharts are a visual representation of program flow. A flowchart normally uses a combination of blocks and arrows to represent actions and sequence. Blocks typically represent actions. The order in which actions occur is shown using arrows that point from statement to statement. Sometimes a block will have multiple arrows coming out of it, representing a step where a decision must be made about which path to follow.

Flowchart Symbols

Start and End symbols are represented as rounded rectangles, usually containing the word “Star” or “End”, but can be more specific such as “Power Robot Off” or “Stop All Motors”.

Actions are represented as rectangles and act as basic commands. Examples: wait(10) increment LineCount by 1 motors full ahead

Decision blocks are represented as diamonds. These typically contain Yes/No questions. Decision blocks have two or more arrows coming Out Of them, representing the different paths that can be followed, depending on the outcome Of the decision. The arrows should always be labelled accordingly.

Example Flowchart

The following flowchart instructs a robot to run forward as long as its touch sensor is not pressed. When the touch sensor is pressed the motors stop and the program ends.
Flowchart Symbols

Example Flowchart

The following flowchart instructs a robot to run forward as long as its color sensor reflected light is less than 10%. When the color sensor reflected light is greater than 10% the robot will stop.
Flowchart Symbols