pxt-ev3/docs/coding/cruise-control.md

65 lines
1.4 KiB
Markdown

# Cruise Control
Learn how to set and adjust motor speeds.
## Activity 1
Increase motor speed when touch sensor `1` is pressed.
```blocks
let speed = 0;
sensors.touch1.onEvent(ButtonEvent.Pressed, function () {
if (speed < 100)
speed = speed + 10;
motors.largeBC.run(speed);
})
```
## Activity 2
Add a "reduce" motor speed action when touch sensor `2` is pressed.
```blocks
let speed = 0;
sensors.touch1.onEvent(ButtonEvent.Pressed, function () {
if (speed < 100)
speed = speed + 10;
motors.largeBC.run(speed);
})
sensors.touch2.onEvent(ButtonEvent.Pressed, function () {
if (speed > -100)
speed = speed - 10;
motors.largeBC.run(speed);
})
```
## Activity 3
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.
```blocks
let speed = 0
function decelerate() {
if (speed > -100) {
speed = speed - 10
}
}
function accelerate() {
if (speed < 100) {
speed = speed + 10
}
}
function update() {
brick.clearScreen()
brick.showString("speed: " + speed, 1)
motors.largeBC.run(speed)
}
sensors.touch2.onEvent(ButtonEvent.Pressed, function () {
accelerate()
update()
})
sensors.touch1.onEvent(ButtonEvent.Pressed, function () {
decelerate()
update()
})
```