Logic
Conditions
Conditions or branching in programs are among the most important control structures in programming. They enable your program to respong to different conditions.
If, do relationship
The if, do block has two free block sections if and do.
The actions linked to the block section do are only executed if the conditions attached to the block section if are met.
For example, the built-in LED on the senseBox MCU should be turned on if the built-in button is pressed.
Commands added after the if, do block will always be executed, even if the condition was not met before.
Else
By clicking on the small gear icon at the top left of the if, do block, you can extend the block with an else section. Commands placed in this section will only be executed if the condition was not met before. If the condition was met, they will be skipped.
For example, the built-in LED 1 should only light up if the built-in button is pressed and else the built-in LED 2 should light up.
Branching
By clicking on the small gear in the top-left corner of the if, do block, you can expand the block with an else if section. First, the top if condition is checked, and if it is not met, the following else if condition is checked. This way, only the commands whose associated condition is met will be executed.
In contrast to the else condition, this allows you to set more than two conditions.
For example, depending on the temperature, a LED should be turned on. If the temperature is below 0°C, LED 1 should turn on; at exactly 0°C, LED 2 should turn on; and at temperatures above 0°C, LED 3 should turn on.
Operators
In Blockly, you have the option to use various logical operators to compare values, such as sensor readings. These operators also allow you to create more complex logical expressions through logical connections.
Logical Comparisons
With the logical comparisons block, you can compare values.
The block offers a selection of six operators:
| Operator | Mathematics |
|---|---|
| equal | = |
| not equal | ≠ |
| less than | < |
| greater than | < |
| less than or equal to | ≤ |
| greater than or equal to | ≥ |
Logical operations
With the logical operations block, you can formulate more complex logical expressions.
For example, a lamp that only lights up when two conditions are met.
The block offers a choice between the operators and and or.
And connects two conditions such that both must be met for the entire expression to be considered true.
Or connects two conditions such that only one of the two must be true for the entire expression to be considered true.
Not Block
With the not block, you can negate expressions. A condition is true if the input value is false and false if it is true.
Test Block
With the test block, you can check a condition and define actions that will be executed based on the result.
