pxt-calliope/docs/examples/servo-calibrator.md

# Servo calibrator

Use this program to calibrate the angles of a servo.
Press ``A`` to reduce the angle by 5 and ``B`` to
increase it by 5.

The current angle is displayed on the screen
in a loop.

```blocks
let angle = 90
input.onButtonPressed(Button.A, () => {
    angle -= Math.max(0, 5)
    pins.servoWritePin(AnalogPin.P0, angle)
    led.stopAnimation()
})
input.onButtonPressed(Button.B, () => {
    angle += Math.min(180, 5)
    pins.servoWritePin(AnalogPin.P0, angle)
    led.stopAnimation()
})
basic.forever(() => {
    basic.showNumber(angle)    
})
pins.servoWritePin(AnalogPin.P0, angle)
```