pxt-calliope/docs/examples/turtle-scanner.md

Turtle Scanner

The turtle scans the display over and over again.

turtle.setPosition(0, 0)
turtle.turnRight()
turtle.setSpeed(20)
basic.forever(() => {
    turtle.forward(4)
    turtle.turnRight()
    turtle.forward(1)
    turtle.turnRight()
    turtle.forward(4)
    turtle.turnLeft()
    turtle.forward(1)
    turtle.turnLeft()
})

microturtle=github:Microsoft/pxt-microturtle#master