UI framework

arduino/hello.ino

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+void setup() {
+  pinMode(LED_BUILTIN, OUTPUT);
+}
+
+void loop() {
+  digitalWrite(LED_BUILTIN, HIGH);
+  delay(10);
+  digitalWrite(LED_BUILTIN, LOW);
+  delay(1000);
+}

pi/ui/lib/main.dart

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+import 'package:flutter/material.dart';
+
+void main() {
+  runApp(const SmartSerowApp());
+}
+
+class SmartSerowApp extends StatelessWidget {
+  const SmartSerowApp({super.key});
+
+  @override
+  Widget build(BuildContext context) {
+    return MaterialApp(
+      title: 'Smart Serow',
+      debugShowCheckedModeBanner: false,
+      theme: ThemeData(
+        colorScheme: ColorScheme.fromSeed(
+          seedColor: Colors.teal,
+          brightness: Brightness.dark,
+        ),
+        useMaterial3: true,
+      ),
+      home: const HomePage(),
+    );
+  }
+}
+
+class HomePage extends StatelessWidget {
+  const HomePage({super.key});
+
+  @override
+  Widget build(BuildContext context) {
+    return Scaffold(
+      backgroundColor: Colors.black,
+      body: Center(
+        child: Column(
+          mainAxisAlignment: MainAxisAlignment.center,
+          children: [
+            Icon(
+              Icons.terrain,
+              size: 120,
+              color: Theme.of(context).colorScheme.primary,
+            ),
+            const SizedBox(height: 24),
+            Text(
+              'Smart Serow',
+              style: Theme.of(context).textTheme.headlineLarge?.copyWith(
+                color: Colors.white,
+                fontWeight: FontWeight.bold,
+              ),
+            ),
+            const SizedBox(height: 8),
+            Text(
+              'System Ready',
+              style: Theme.of(context).textTheme.bodyLarge?.copyWith(
+                color: Colors.grey,
+              ),
+            ),
+          ],
+        ),
+      ),
+    );
+  }
+}

pi/ui/pubspec.yaml

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+name: smartserow_ui
+description: Smart Serow embedded UI for Raspberry Pi Zero 2W
+publish_to: 'none'
+version: 0.1.0
+
+environment:
+  sdk: '>=3.0.0 <4.0.0'
+
+dependencies:
+  flutter:
+    sdk: flutter
+
+dev_dependencies:
+  flutter_test:
+    sdk: flutter
+  flutter_lints: ^3.0.0
+
+flutter:
+  uses-material-design: true

scripts/build.sh

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+#!/bin/bash
+# Build script for Smart Serow Flutter UI
+# Run this in WSL2 with flutter-elinux installed
+
+set -e
+
+SCRIPT_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
+PROJECT_ROOT="$(dirname "$SCRIPT_DIR")"
+UI_DIR="$PROJECT_ROOT/pi/ui"
+
+echo "=== Smart Serow Build ==="
+echo "Project: $UI_DIR"
+
+cd "$UI_DIR"
+
+# Clean previous build (optional, comment out for faster incremental builds)
+# flutter-elinux clean
+
+echo "Fetching dependencies..."
+flutter-elinux pub get
+
+echo "Building for ARM64 (elinux)..."
+flutter-elinux build elinux --target-arch=arm64 --release
+
+BUILD_OUTPUT="$UI_DIR/build/elinux/arm64/release/bundle"
+
+if [ -d "$BUILD_OUTPUT" ]; then
+    echo ""
+    echo "=== Build Complete ==="
+    echo "Output: $BUILD_OUTPUT"
+    ls -lh "$BUILD_OUTPUT"
+else
+    echo "ERROR: Build output not found at $BUILD_OUTPUT"
+    exit 1
+fi

scripts/deploy.sh

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+#!/bin/bash
+# Deploy script for Smart Serow Flutter UI
+# Pushes build bundle to Pi and optionally restarts service
+
+set -e
+
+SCRIPT_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
+PROJECT_ROOT="$(dirname "$SCRIPT_DIR")"
+CONFIG_FILE="$SCRIPT_DIR/deploy_target.json"
+
+# Parse config
+if [ ! -f "$CONFIG_FILE" ]; then
+    echo "ERROR: Config file not found: $CONFIG_FILE"
+    exit 1
+fi
+
+HOST=$(jq -r '.host' "$CONFIG_FILE")
+REMOTE_PATH=$(jq -r '.remote_path' "$CONFIG_FILE")
+SERVICE_NAME=$(jq -r '.service_name' "$CONFIG_FILE")
+
+BUILD_DIR="$PROJECT_ROOT/pi/ui/build/elinux/arm64/release/bundle"
+
+echo "=== Smart Serow Deploy ==="
+echo "Target: $HOST:$REMOTE_PATH"
+echo "Source: $BUILD_DIR"
+
+if [ ! -d "$BUILD_DIR" ]; then
+    echo "ERROR: Build directory not found. Run build.sh first."
+    exit 1
+fi
+
+# Sync build to Pi
+echo ""
+echo "Syncing files..."
+rsync -avz --delete \
+    "$BUILD_DIR/" \
+    "$HOST:$REMOTE_PATH/bundle/"
+
+# Restart service if requested
+RESTART="${1:-}"
+if [ "$RESTART" = "--restart" ] || [ "$RESTART" = "-r" ]; then
+    echo ""
+    echo "Restarting service: $SERVICE_NAME"
+    ssh "$HOST" "sudo systemctl restart $SERVICE_NAME"
+    sleep 2
+    ssh "$HOST" "systemctl status $SERVICE_NAME --no-pager"
+else
+    echo ""
+    echo "Deploy complete. To restart service, run:"
+    echo "  ssh $HOST 'sudo systemctl restart $SERVICE_NAME'"
+    echo ""
+    echo "Or run this script with --restart flag"
+fi

scripts/deploy_target.json

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+{
+  "host": "pi@smartserow.local",
+  "remote_path": "/opt/smartserow",
+  "service_name": "smartserow-ui"
+}

scripts/pi_setup.sh

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+#!/bin/bash
+# One-time setup script for Smart Serow on Raspberry Pi
+# Run this ON the Pi itself
+
+set -e
+
+echo "=== Smart Serow Pi Setup ==="
+
+# Check if running on Pi (arm architecture)
+ARCH=$(uname -m)
+if [[ "$ARCH" != "aarch64" && "$ARCH" != "armv7l" ]]; then
+    echo "WARNING: This doesn't look like a Pi (arch: $ARCH)"
+    echo "Continuing anyway..."
+fi
+
+APP_DIR="/opt/smartserow"
+SERVICE_FILE="/etc/systemd/system/smartserow-ui.service"
+
+# Create app directory
+echo "Creating app directory: $APP_DIR"
+sudo mkdir -p "$APP_DIR/bundle"
+sudo chown -R pi:pi "$APP_DIR"
+
+# Install runtime dependencies for flutter-elinux
+echo "Installing runtime dependencies..."
+sudo apt-get update
+sudo apt-get install -y \
+    libgl1-mesa-dri \
+    libgles2-mesa \
+    libegl1-mesa \
+    libdrm2 \
+    libgbm1 \
+    libinput10 \
+    libudev1 \
+    fonts-noto
+
+# For X11 debug mode (optional but useful)
+sudo apt-get install -y \
+    xorg \
+    xinit \
+    libx11-6 \
+    libxkbcommon-x11-0
+
+# Copy systemd service
+echo "Installing systemd service..."
+SCRIPT_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
+if [ -f "$SCRIPT_DIR/smartserow-ui.service" ]; then
+    sudo cp "$SCRIPT_DIR/smartserow-ui.service" "$SERVICE_FILE"
+else
+    echo "WARNING: Service file not found at $SCRIPT_DIR/smartserow-ui.service"
+    echo "Copy it manually to $SERVICE_FILE"
+fi
+
+# Enable service
+echo "Enabling service..."
+sudo systemctl daemon-reload
+sudo systemctl enable smartserow-ui
+
+# Add pi user to required groups for DRM/KMS access
+echo "Setting up permissions..."
+sudo usermod -aG video pi
+sudo usermod -aG input pi
+sudo usermod -aG render pi 2>/dev/null || true
+
+echo ""
+echo "=== Setup Complete ==="
+echo ""
+echo "Next steps:"
+echo "1. Deploy the app: run deploy.sh from your dev machine"
+echo "2. Start service:  sudo systemctl start smartserow-ui"
+echo "3. Or reboot:      sudo reboot"
+echo ""
+echo "Useful commands:"
+echo "  systemctl status smartserow-ui    # Check status"
+echo "  journalctl -u smartserow-ui -f    # View logs"
+echo ""

scripts/smartserow-ui.service

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+[Unit]
+Description=Smart Serow UI
+After=multi-user.target
+Wants=multi-user.target
+
+[Service]
+Type=simple
+User=pi
+Group=pi
+WorkingDirectory=/opt/smartserow/bundle
+
+# DRM/KMS backend for direct framebuffer (no X11 needed)
+ExecStart=/opt/smartserow/bundle/smartserow_ui -b drm
+
+# Restart on crash
+Restart=always
+RestartSec=3
+
+# Environment for DRM/KMS access
+Environment=XDG_RUNTIME_DIR=/run/user/1000
+Environment=HOME=/home/pi
+
+# Give time for GPU to initialize on boot
+ExecStartPre=/bin/sleep 2
+
+# Ensure clean shutdown
+TimeoutStopSec=10
+
+[Install]
+WantedBy=multi-user.target