pxt-calliope/docs/reference/pins/servo-write-pin.md

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2016-03-26 00:47:20 +01:00
# Servo Write Pin
Writes a value to the servo on to the specified [pin](/microbit/device/pins) (``P0``, ``P1``, ``P2``), controlling the shaft accordingly.
* on a standard servo, this will set the angle of the shaft (in degrees), moving the shaft to that orientation.
* on a continuous rotation servo, this will set the speed of the servo (with 0 being full-speed in one direction, 180 being full speed in the other, and a value near 90 being no movement).
```sig
pins.servoWritePin(AnalogPin.P0, 180)
```
### Parameters
* `name` - [String](/microbit/reference/types/string); the pin name ("P0", "P1", or "P2")
* `value` - a [Number](/microbit/reference/types/number) between 0 and 180 included
### Examples
* setting the shaft angle to mid point on a servo
```blocks
pins.servoWritePin(AnalogPin.P0, 90)
```
* control the shaft by using the tilt information of the accelerometer
```blocks
basic.forever(() => {
let millig = input.acceleration(Dimensions.X)
// map accelerometer readings to angle
let angle = pins.map(millig, -1023, 1023, 0, 180)
pins.servoWritePin(AnalogPin.P0, angle)
})
```
* setting the full speed on a continuous servo
```blocks
pins.servoWritePin(AnalogPin.P0, 0)
```
### See also
[BBC micro:bit pins](/microbit/device/pins), [servo set pulse](/microbit/reference/pins/servo-set-pulse)