Exercice : Wait for Touch [LEGO® MINDSTORMS® EV3]

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Check Your Understanding:

What does the robot do when the WaitTouch program runs?

The program waits BEFORE it moves because...

What happens if you're already holding down the Touch Sensor's button when you start running the program?

The Wait Block detects that the sensor is “Pressed” and passes control to the Move Block.

“Pressed” simply means “the button is in the pressed position”; it does not matter how or when it was pressed in!

The 5 buttons on the front of the EV3 (not counting the Cancel button) can be used as Touch Sensors.

Try changing the Mode of the Wait Block to “Brick Buttons > Compare > Brick Buttons” and running your program.

Once it's running, press the middle button on the front of the EV3.

What happens ?

Waits for the middle button on the EV3 to be pressed in, then moves 1 rotation.
The Wait Block now waits for the middle button on the EV3 to be pressed.
The robot then moves.
Waits for 1 second, then moves 1 rotation.
Waits for the Touch Sensor to be pressed in, then moves 1 rotation.
Runs for 1 rotation.

Wait for Touch