was Pressed

See if a button on a remote infrared beacon was pressed since the last time it was checked.


An infrared beacon works with an infrared sensor connected to the LEGO® MINDSTORMS® Education EV3. The beacon sends a signal over infrared with information about button presses on the beacon. The infrared sensor receives the signal from the beacon and records a button event.

If a button was pressed, then that event is remembered. Once you check if a beacon button was pressed, that status is set back to false. If you check again before the beacon button is pressed another time, the was pressed status is false. Only when the button is pressed will the was pressed status go to true.


  • a boolean value that is true if the beacon button was pressed before. It’s false if the button was not pressed.

Remote channel

In order to recognize a button event signalled from a remote beacon, an infrared sensor must know what channel to listen on for messages from that beacon. An infrared sensor needs to set the channel first, then it can receive messages transmitted by the beacon. Before waiting for, or checking on an button event from a beacon, use set remote channel.


If the beacon button top left was pressed, show a green status light. Otherwise, set the status light to orange.

forever(function () {
    if (sensors.remoteButtonTopLeft.wasPressed()) {
    } else {

See also

is pressed, on event

EV3 Infrared Beacon