React Native – How to use device sensor?

What’s device coordinate frame?

react-native-sensors

Detect device shake

import {
  accelerometer,
  setUpdateIntervalForType,
  SensorTypes,
} from 'react-native-sensors';
import {map, filter} from 'rxjs/operators';
...

const [lastShakeTime, setLastShakeTime] = useState(0);

useEffect(() => {
    const SHAKE_THRESHOLD = 10;  // This is shake sensitivity - lowering this will give high sensitivity and increasing this will give lower sensitivity
    const MIN_TIME_BETWEEN_SHAKES_MILLISECS = 1000;
    setUpdateIntervalForType(SensorTypes.accelerometer, 200);
    
    const subscription = accelerometer
        .pipe(
        map(
            ({x, y, z}) =>
            Math.sqrt(
                Math.pow(x, 2) + Math.pow(y, 2) + Math.pow(z, 2),
            ) /* - SensorManager.GRAVITY_EARTH */,
        ),
        filter((acceleration) => acceleration > SHAKE_THRESHOLD),
        )
        .subscribe((acceleration) => {
            const curTime = new Date().getTime();
            if (curTime - lastShakeTime > MIN_TIME_BETWEEN_SHAKES_MILLISECS) {
                setLastShakeTime(curTime);
                console.log('Shaked device! acceleration: ', acceleration);
            }
        });
    return () => {
        subscription.unsubscribe();
    };
});

But build is error in iOS !!

expo-sensors

Installation

• Install “react-native-unimodules” installing-unimodules
• Install “expo-sensors” existing-apps
  yarn add expo-sensors
  npx pod-install

Detect device shake

import { Accelerometer } from 'expo-sensors';
...

useEffect(() => {
    addSensorListener(() => {
        //add your code here
        console.log('Shake Shake Shake');
    });

    return () => {
        removeListener();
    };
});

const addSensorListener = (handler) => {
    //this is shake sensitivity - lowering this will give high sensitivity and increasing this will give lower sensitivity
    const THRESHOLD = 1;
    let last_x, last_y, last_z;
    let lastUpdate = 0;
    Accelerometer.addListener((accelerometerData) => {
        let { x, y, z } = accelerometerData;
        let currTime = Date.now();
        if (currTime - lastUpdate > 100) {
            let diffTime = currTime - lastUpdate;
            lastUpdate = currTime;
            let speed =
                (Math.abs(x + y + z - last_x - last_y - last_z) / diffTime) * 10000;
            if (speed > THRESHOLD) {
                handler();
            }
            last_x = x;
            last_y = y;
            last_z = z;
        }
    });
};

const removeListener = () => {
    Accelerometer.removeAllListeners();
};