65 lines
1.4 KiB
Markdown
65 lines
1.4 KiB
Markdown
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# Cruise Control
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Learn how to set and adjust motor speeds.
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## Activity 1
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Increase motor speed when touch sensor `1` is pressed.
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```blocks
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let speed = 0;
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sensors.touch1.onEvent(ButtonEvent.Pressed, function () {
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if (speed < 100)
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speed = speed + 10;
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motors.largeBC.run(speed);
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})
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```
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## Activity 2
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Add a "reduce" motor speed action when touch sensor `2` is pressed.
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```blocks
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let speed = 0;
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sensors.touch1.onEvent(ButtonEvent.Pressed, function () {
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if (speed < 100)
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speed = speed + 10;
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motors.largeBC.run(speed);
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})
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sensors.touch2.onEvent(ButtonEvent.Pressed, function () {
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if (speed > -100)
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speed = speed - 10;
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motors.largeBC.run(speed);
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})
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```
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## Activity 3
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Refactor your code by moving the speed increase and speed decrease code into ``||functions:accelerate||`` and ``||functions:decelerate||`` functions. Run the motors at the new speed in an ``||functions:update||`` function.
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```blocks
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let speed = 0
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function decelerate() {
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if (speed > -100) {
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speed = speed - 10
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}
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}
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function accelerate() {
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if (speed < 100) {
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speed = speed + 10
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}
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}
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function update() {
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brick.clearScreen()
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brick.showString("speed: " + speed, 1)
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motors.largeBC.run(speed)
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}
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sensors.touch2.onEvent(ButtonEvent.Pressed, function () {
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accelerate()
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update()
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})
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sensors.touch1.onEvent(ButtonEvent.Pressed, function () {
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decelerate()
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update()
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})
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```
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