PlateSpotter – U.S. License Plate Tracker

by Miles Laker for CS153a Brandeis University
This is an Expo project created with create-expo-app. My final build with all working features is the FINALBUILDPEERREVIEW.js file, if you wish to run this version use that file instead of app.js

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1. Install dependencies

npm install

2. Start the app

npx expo start

In the output, you'll find options to open the app in a:

• development build
• Android emulator
• iOS simulator
• Expo Go, a limited sandbox for trying out app development with Expo

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App Features

• Track which U.S. license plates you’ve seen on a road trip
• Real time compass using your phone’s magnetometer
• Add notes to each license plate you see
• Geotag the location where you spotted the plate
• View all tagged plates on a full U.S. map
• Saves your data locally using AsyncStorage

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How it Works

• Multi-screen navigation powered by React Navigation
• Phone sensors (location + compass) via expo-location and expo-sensors
• Data persistence using @react-native-async-storage/async-storage
• Notes and map markers are tied to each license plate type per state

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Project Structure

All major files live inside the App.js root file. Assets like plate images and the compass are in the /assets directory.