Gyroscope

Gyroscope from expo-sensors provides access to the device's gyroscope sensor to respond to changes in rotation in 3D space.

Platform Compatibility

Android DeviceAndroid EmulatoriOS DeviceiOS SimulatorWeb

expo install expo-sensors

If you're installing this in a bare React Native app, you should also follow these additional installation instructions.

import React, { useState, useEffect } from 'react';
import { StyleSheet, Text, TouchableOpacity, View } from 'react-native';
import { Gyroscope } from 'expo-sensors';

export default function App() {
  const [data, setData] = useState({});

  useEffect(() => {
    _toggle();
  }, []);

  useEffect(() => {
    return () => {
      _unsubscribe();
    };
  }, []);

  const _toggle = () => {
    if (this._subscription) {
      _unsubscribe();
    } else {
      _subscribe();
    }
  };

  const _slow = () => {
    Gyroscope.setUpdateInterval(1000);
  };

  const _fast = () => {
    Gyroscope.setUpdateInterval(16);
  };

  const _subscribe = () => {
    this._subscription = Gyroscope.addListener(gyroscopeData => {
      setData(gyroscopeData);
    });
  };

  const _unsubscribe = () => {
    this._subscription && this._subscription.remove();
    this._subscription = null;
  };

  let { x, y, z } = data;
  return (
    <View style={styles.sensor}>
      <Text style={styles.text}>Gyroscope:</Text>
      <Text style={styles.text}>
        x: {round(x)} y: {round(y)} z: {round(z)}
      </Text>
      <View style={styles.buttonContainer}>
        <TouchableOpacity onPress={_toggle} style={styles.button}>
          <Text>Toggle</Text>
        </TouchableOpacity>
        <TouchableOpacity onPress={_slow} style={[styles.button, styles.middleButton]}>
          <Text>Slow</Text>
        </TouchableOpacity>
        <TouchableOpacity onPress={_fast} style={styles.button}>
          <Text>Fast</Text>
        </TouchableOpacity>
      </View>
    </View>
  );
}

function round(n) {
  if (!n) {
    return 0;
  }

  return Math.floor(n * 100) / 100;
}

import { Gyroscope } from 'expo-sensors';

You should always check the sensor availability before attempting to use it.
Returns whether the gyroscope is enabled on the device.
On mobile web, you must first invoke Permissions.askAsync(Permissions.MOTION) in a user interaction (i.e. touch event) before you can use this module. If the status is not equal to granted then you should inform the end user that they may have to open settings.
On web this starts a timer and waits to see if an event is fired. This should predict if the iOS device has the device orientation API disabled in Settings > Safari > Motion & Orientation Access. Some devices will also not fire if the site isn't hosted with HTTPS as DeviceMotion is now considered a secure API. There is no formal API for detecting the status of DeviceMotion so this API can sometimes be unreliable on web.

  • A promise that resolves to a boolean denoting the availability of the sensor.

Subscribe for updates to the gyroscope.

  • listener (function) -- A callback that is invoked when an gyroscope update is available. When invoked, the listener is provided a single argument that is an object containing keys x, y, z.

  • An EventSubscription object that you can call remove() on when you would like to unsubscribe the listener.

Remove all listeners.

Subscribe for updates to the gyroscope.

  • intervalMs (number) -- Desired interval in milliseconds between gyroscope updates.