* Reduce the use of @boardname@

* Use literal 'EV3 Brick' string instead

* Use the new 'nickname' form

2018-04-16 16:15:58 -07:00

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Security Alert

Introduction @fullscreen

The Infrared Sensor uses infrared light waves to detect proximity to the robot. Build an security alert using the infrared sensor.

Step 1

Open the ||sensors:Sensors|| Toolbox drawer. Drag out an ||sensors:on infrared|| block onto the Workspace (you can place this anywhere). Use the second drop-down menu to select detected.

sensors.infrared1.onEvent(InfraredSensorEvent.ObjectDetected, function () {

})

Step 2

Open the ||brick:Brick|| Toolbox drawer. From the Screen section, drag out a ||brick:show image|| block onto the Workspace, and drop it into the ||sensors:on infrared|| block.

sensors.infrared1.onEvent(InfraredSensorEvent.ObjectDetected, function () {
    brick.showImage(images.expressionsBigSmile)
})

Step 3

In the ||brick:show image|| block, use the drop-down menu to select the STOP sign image.

sensors.infrared1.onEvent(InfraredSensorEvent.ObjectDetected, function () {
    brick.showImage(images.informationStop1)
})

Step 4

Open the ||brick:Brick|| Toolbox drawer. From the Buttons section, drag out a ||brick:set status light|| block onto the Workspace, and drop it after the ||brick:show image|| block.

sensors.infrared1.onEvent(InfraredSensorEvent.ObjectDetected, function () {
    brick.showImage(images.informationStop1)
    brick.setStatusLight(StatusLight.Orange)
})

Step 5

In the ||brick:set status light|| block, use the drop-down menu to select the red flash light

sensors.infrared1.onEvent(InfraredSensorEvent.ObjectDetected, function () {
    brick.showImage(images.informationStop1)
    brick.setStatusLight(StatusLight.RedFlash)
})

Step 6

Open the ||loops:Loops|| Toolbox drawer. Drag a ||loops:repeat|| loop onto the Workspace, and drop it after the ||brick:set status light|| block.

sensors.infrared1.onEvent(InfraredSensorEvent.ObjectDetected, function () {
    brick.showImage(images.informationStop1)
    brick.setStatusLight(StatusLight.RedFlash)
    for (let i = 0; i < 4; i++) {

    }
})

Step 7

Open the ||music:Music|| Toolbox drawer. Drag a ||music:play sound effect until done|| block onto the Workspace, and drop it into the ||loops:repeat|| loop.

sensors.infrared1.onEvent(InfraredSensorEvent.ObjectDetected, function () {
    brick.showImage(images.informationStop1)
    brick.setStatusLight(StatusLight.RedFlash)
    for (let i = 0; i < 4; i++) {
        music.playSoundEffectUntilDone(sounds.animalsCatPurr)
    }
})

Step 8

In the ||music:play sound effect until done|| block, use the drop-down menu to select information error alarm sound effect.

Step 9

Now, plug your EV3 Brick into the computer with the USB cable, and click the Download button at the bottom of your screen. Follow the directions to save your program to the brick.

Attach an Infrared Sensor to Port 1 of your brick. Test your program by putting an object increasingly closer to the Infrared Sensor – your Intruder Alert should trigger when you get too close!

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