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95 lines
2.7 KiB
95 lines
2.7 KiB
import React, {Component} from 'react'; |
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import {Dimensions, Image, ScrollView, StyleSheet, View, TouchableOpacity} from 'react-native'; |
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import MyText from './mytext.js'; |
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import MyImage from './myimage.js'; |
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import Section from './section.js'; |
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const images = { |
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img1: { |
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source: require('../images/example1.png'), |
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width: 1857, |
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height: 574, |
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}, |
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img2: { |
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source: require('../images/example2.png'), |
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width: 1857, |
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height: 574, |
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}, |
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img3: { |
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source: require('../images/example3.png'), |
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width: 1857, |
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height: 574, |
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}, |
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img4: { |
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source: require('../images/example4.png'), |
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width: 1857, |
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height: 574, |
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}, |
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img5: { |
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source: require('../images/example5.png'), |
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width: 1857, |
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height: 574, |
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}, |
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img6: { |
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source: require('../images/example6.png'), |
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width: 1857, |
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height: 574, |
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}, |
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img7: { |
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source: require('../images/example7.png'), |
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width: 1857, |
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height: 574, |
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}, |
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}; |
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export default class Example extends Component { |
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constructor(props) { |
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super(props); |
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this.state = { |
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viewInfo: {}, |
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}; |
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} |
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render() { |
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const {viewInfo} = this.state; |
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return ( |
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<ScrollView> |
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<View onLayout={(event) => this.setState({ |
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viewInfo: event.nativeEvent, |
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})} style={{padding: 20}}> |
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<Section> |
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<MyText>Suppose our design calls for an 863 Ω resistance. First, we enter 863 Ω into the top field:</MyText> |
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<MyImage view={viewInfo} data={images.img1} /> |
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</Section> |
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<Section> |
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<MyText>The calulator will recommend 863 Ω, but we don't have anything close to that in our bin of scrap resistors. We find a 1 kΩ resistor and measure it to be 992 Ω. We enter this into the calculator:</MyText> |
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<MyImage view={viewInfo} data={images.img2} /> |
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</Section> |
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<Section> |
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<MyText>You will see the calculator now recommends we add a 6.64 kΩ resistor, and is telling us we are 14.9% away from our 863 Ω target:</MyText> |
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<MyImage view={viewInfo} data={images.img3} /> |
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</Section> |
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<Section> |
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<MyText>The closest we can find is 6.8 kΩ, which we measure to be 6740 Ω. We now enter this value too:</MyText> |
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<MyImage view={viewInfo} data={images.img4} /> |
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</Section> |
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<Section> |
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<MyText>Now it recommends 432 kΩ, and we are 0.2% away from the target (pretty good for two resistors):</MyText> |
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<MyImage view={viewInfo} data={images.img5} /> |
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</Section> |
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<Section> |
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<MyText>If we wanted to get even closer, we can keep going. We find a 470 kΩ resistor that reads 489.3 kΩ and enter it:</MyText> |
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<MyImage view={viewInfo} data={images.img6} /> |
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</Section> |
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<Section> |
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<MyText>The calculator is now telling us we are right on our target with 0.00% error:</MyText> |
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<MyImage view={viewInfo} data={images.img7} /> |
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</Section> |
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</View> |
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</ScrollView> |
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); |
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} |
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} |
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