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App.js
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App.js
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import React, { useState, useEffect, useRef } from 'react';
import { StyleSheet, Text, TouchableOpacity, View, Platform } from 'react-native';
import { Barometer } from 'expo-sensors';
import Constants from 'expo-constants';
import * as Speech from 'expo-speech';
import { Card } from 'react-native-paper';
export default function App(props) {
const PRESSURE_STANDARD_ATMOSPHERE = 1013.25 // 1013.25
const TAKEOFF_DETECT_DELTA = 1;
const [data, setData] = useState({});
const [takeoff, setTakeoff] = useState({});
const [timestamp, setTimestamp] = useState(0);
const stateRef = useRef();
stateRef.current = timestamp;
useEffect(async () => {
_initialize();
_getTakeoffAltitude();
_toggle();
}, []);
useEffect(() => {
return () => {
_unsubscribe();
};
}, []);
const _toggle = () => {
if (this._subscription) {
_unsubscribe();
} else {
_subscribe();
}
};
const _subscribe = () => {
this._subscription = Barometer.addListener(barometerData => {
let alt = Math.round(_getAltitude(PRESSURE_STANDARD_ATMOSPHERE, barometerData.pressure));
barometerData.altitudeAmsl = alt;
barometerData.altitudeDelta = alt - takeoff.takeoffAltitude;
if ((stateRef.current === 0) && ((alt - takeoff.takeoffAltitude) > TAKEOFF_DETECT_DELTA)) {
_takeoffDetected(new Date().getTime());
}
setData(barometerData);
});
};
const _unsubscribe = () => {
this._subscription && this._subscription.remove();
this._subscription = null;
};
const _getAltitude = (p0, p) => {
return 44330 * (1 - Math.pow(p / p0, 1.0 / 5.255));
}
const _initialize = async () => {
/*let { status } = await Barometer.isAvailableAsync();
if (!status) {
console.error('No barometer sensor available');
return;
}*/
}
const _getTakeoffAltitude = () => {
let sub = Barometer.addListener(barometerData => {
takeoff.takeoffPressure = barometerData.pressure;
takeoff.takeoffAltitude = Math.round(_getAltitude(PRESSURE_STANDARD_ATMOSPHERE, barometerData.pressure)-1);
setTakeoff(takeoff);
sub.remove();
});
}
const _takeoffDetected = (ts) => {
setTimestamp(ts);
Speech.speak('FlightVoice takeoff, altitude ' + takeoff.takeoffAltitude + 'meters, have an amazing flight !', {
rate: 0.33,
volume: 100
});
}
const {
pressure = -1,
relativeAltitude = -1,
//
altitudeAmsl = -1,
altitudeDelta = -1
} = data;
const {
takeoffPressure = -1,
takeoffAltitude = -1
} = takeoff;
return (
<View style={styles.container}>
<Text style={styles.header}>FlightVoice v0.1</Text>
<Card>
<Text style={styles.paragraph}>Takeoff altitude: {takeoffAltitude} m AMSL</Text>
<Text style={styles.paragraph}>Takeoff time: {new Date(timestamp).toLocaleTimeString()}</Text>
<Text style={styles.paragraph}>Current altitude: {altitudeAmsl} m AMSL</Text>
<Text style={styles.paragraph}>Altitude delta: {altitudeDelta} m AMSL</Text>
</Card>
<View style={styles.buttonContainer}>
<TouchableOpacity onPress={_toggle} style={styles.button}>
<Text>Toggle barometer updates</Text>
</TouchableOpacity>
</View>
<Text style={styles.mini}>Pressure: {pressure} hPa</Text>
</View>
);
}
const styles = StyleSheet.create({
container: {
flex: 1,
textAlign: 'center',
justifyContent: 'center',
paddingTop: Constants.statusBarHeight,
backgroundColor: '#ecf0f1',
padding: 8,
},
paragraph: {
margin: 24,
fontSize: 18,
fontWeight: 'bold',
textAlign: 'center'
},
buttonContainer: {
flexDirection: 'row',
alignItems: 'stretch',
marginTop: 15,
},
button: {
flex: 1,
justifyContent: 'center',
alignItems: 'center',
backgroundColor: 'yellow',
padding: 10,
},
mini: {
textAlign: 'center',
marginTop: 10
},
header: {
margin: 30,
fontSize: 30,
fontWeight: 'bold',
textAlign: 'center'
}
});