pxt-ev3/docs/coding/reverse-beeper-1.md

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# Reverse Beeper Activity 1
```blocks
forever(function () {
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music.playTone(440, sensors.ultrasonic4.distance());
pause(50)
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})
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motors.largeBC.run(-20);
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sensors.ultrasonic4.pauseUntil(UltrasonicSensorEvent.ObjectNear);
motors.largeBC.stop();
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```