reverse beeper

docs/coding/reverse-beeper-1.md

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

docs/coding/reverse-beeper-2.md

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+# Reverse Beeper Activity 2
+
+```blocks
+loops.forever(function () {
+    if (motors.largeB.speed() != 0 && sensors.ultrasonic4.distance() < 20) {
+        music.playTone(440, sensors.ultrasonic4.distance());
+        loops.pause(50)
+    }
+})
+motors.largeBC.setSpeed(-20);
+sensors.ultrasonic4.pauseUntil(UltrasonicSensorEvent.ObjectNear);
+motors.stopAllMotors();
+```

docs/coding/reverse-beeper-3.md

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+# Reverse Beeper Activity 2
+
+```blocks
+let beep = false
+beep = true
+control.runInBackground(function () {
+    motors.largeB.setSpeed(-20)
+    motors.largeC.setSpeed(-20)
+    sensors.ultrasonic4.pauseUntil(UltrasonicSensorEvent.ObjectNear)
+    motors.stopAllMotors()
+    beep = false
+})
+control.runInBackground(function () {
+    while (beep) {
+        if (sensors.ultrasonic4.distance() < 20) {
+            music.playTone(440, sensors.ultrasonic4.distance())
+            loops.pause(50)
+        }
+    }
+})
+```