xod/docs/tutorial/19-if-else

title

title
If-else branching

#19. If-else branching

Note This is a web-version of a tutorial chapter embedded right into the XOD IDE. To get a better learning experience we recommend to install the IDE, launch it, and you’ll see the same tutorial there.

All the comparison nodes return true or false.

Let's imagine that you need to turn the servo to a certain angle, for instance to 45° when you receive true, and to 135° when you receive false. How can we make that work?

There is an if-else node in xod/core. The COND pin of this node checks the boolean input value. If COND receives true, the node sets the value from the T pin to the R pin. When it receives false, it sets the value from the F pin to the R pin.

Now simply set the T value to 0.25 and the F value to 0.75 to make things work.

Test circuit

↓ Download as a Fritzing project

Now, if the comparison condition is true, the servo will turn to the angle from the T pin of the if-else node or, otherwise, to the angle set in the F pin of the same node.

Next lesson →