pxt-calliope/docs/projects/servo-calibrator.md
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# 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, angle - 5)
pins.servoWritePin(AnalogPin.P0, angle)
led.stopAnimation()
})
input.onButtonPressed(Button.B, () => {
angle = Math.min(180, angle + 5)
pins.servoWritePin(AnalogPin.P0, angle)
led.stopAnimation()
})
basic.forever(() => {
basic.showNumber(angle)
})
pins.servoWritePin(AnalogPin.P0, angle)
```