106 lines
3.6 KiB
Markdown
106 lines
3.6 KiB
Markdown
# Intruder Alert
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## Introduction @fullscreen
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The Infrared Sensor uses infrared light waves to detect proximity to the robot. Build an intruder alert using the infrared sensor.
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## Step 1
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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``.
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```blocks
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sensors.infrared1.onEvent(InfraredSensorEvent.ObjectDetected, function () {
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})
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```
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## Step 2
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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.
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```blocks
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sensors.infrared1.onEvent(InfraredSensorEvent.ObjectDetected, function () {
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brick.showImage(images.expressionsBigSmile)
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})
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```
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## Step 3
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In the ``||brick:show image||`` block, use the drop-down menu to select the **STOP** sign image.
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```blocks
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sensors.infrared1.onEvent(InfraredSensorEvent.ObjectDetected, function () {
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brick.showImage(images.informationStop1)
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})
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```
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## Step 4
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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.
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```blocks
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sensors.infrared1.onEvent(InfraredSensorEvent.ObjectDetected, function () {
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brick.showImage(images.informationStop1)
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brick.setStatusLight(StatusLight.Orange)
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})
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```
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## Step 5
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In the ``||brick:set status light||`` block, use the drop-down menu to select the ``red flash`` light
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```blocks
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sensors.infrared1.onEvent(InfraredSensorEvent.ObjectDetected, function () {
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brick.showImage(images.informationStop1)
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brick.setStatusLight(StatusLight.RedFlash)
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})
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```
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## Step 6
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Open the ``||loops:Loops||`` Toolbox drawer. Drag a ``||loops:repeat||`` loop onto the Workspace, and drop it after the ``||brick:set status light||`` block.
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```blocks
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sensors.infrared1.onEvent(InfraredSensorEvent.ObjectDetected, function () {
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brick.showImage(images.informationStop1)
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brick.setStatusLight(StatusLight.RedFlash)
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for (let i = 0; i < 4; i++) {
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}
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})
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```
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## Step 7
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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.
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```blocks
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sensors.infrared1.onEvent(InfraredSensorEvent.ObjectDetected, function () {
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brick.showImage(images.informationStop1)
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brick.setStatusLight(StatusLight.RedFlash)
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for (let i = 0; i < 4; i++) {
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music.playSoundEffectUntilDone(sounds.animalsCatPurr)
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}
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})
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```
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## Step 8
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In the ``||music:play sound effect until done||`` block, use the drop-down menu to select ``information error alarm`` sound effect.
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## Step 9
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Now, plug your @boardname@ 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.
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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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