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Troubleshooting

Camera or Barcode Scanner Not Working

Troubleshoot issues with the in-app camera and barcode scanning features.

If you're having trouble with the in-app camera or barcode scanner, follow these steps to resolve the issue.

Step 1: Check Camera Permissions

The app needs permission to use your device's camera.

How to check:

Step 1: Open the Settings app on your iPhone

Step 2: Scroll down and tap on "Sunu"

Step 3: Look for "Camera" in the list of permissions

Step 4: Ensure the toggle is turned ON

If it was off:

  • Turn it on
  • Return to Sunu
  • Try using the camera again

Step 2: Ensure a Clear View

For Barcode Scanning

Optimal conditions:

  • Entire barcode visible in camera frame
  • Good lighting on the barcode
  • No shadows across the code
  • No glare or reflections
  • Barcode is flat and undamaged

Technique:

  • Hold phone steady for 2-3 seconds
  • Keep barcode centered
  • Distance: 4-8 inches from barcode
  • Perpendicular angle (straight on)
  • Wait for recognition beep or vibration

Common issues:

  • Too close or too far
  • Barcode wrinkled or damaged
  • Poor lighting conditions
  • Moving phone too much
  • Wrong type of barcode

For Taking Photos

Best practices:

  • Subject is well-lit
  • Camera lens is clean
  • Subject is in focus
  • Stable hand or phone position
  • Good contrast between subject and background

For food photos:

  • Natural or bright lighting
  • Full plate visible
  • Clear view of all items
  • Avoid extreme shadows
  • Close enough to see details

Step 3: Restart the App

If permissions are correct and the view is clear, completely closing and reopening the app can often resolve temporary glitches.

How to restart:

Step 1: Swipe up from the bottom of your screen (or double-press the Home button on older iPhones)

Step 2: This opens the app switcher

Step 3: Find the Sunu app card

Step 4: Swipe it up to close it completely

Step 5: Return to your Home Screen

Step 6: Tap the Sunu app icon to relaunch

Barcode-Specific Troubleshooting

Different Barcode Types

Supported barcodes:

  • GS1 DataMatrix (medication barcodes)
  • UPC/EAN (food product barcodes)
  • QR codes (certain features)

Not all barcodes work:

  • Some barcodes aren't in our database
  • Custom or proprietary codes may not scan
  • Damaged barcodes can't be read

Medication Barcode Issues

For GS1 DataMatrix codes:

  • Square, pixelated appearance
  • Usually on prescription boxes
  • Contains lot number and expiration
  • More sensitive to lighting

If not scanning:

  • Ensure it's a DataMatrix code, not regular barcode
  • Try different angle
  • Improve lighting
  • Smooth out any wrinkles
  • Try a different unit of the same medication

Food Barcode Issues

For UPC/EAN codes:

  • Traditional striped barcodes
  • On most packaged foods
  • Should scan relatively easily

If not scanning:

  • Clean the barcode area
  • Better lighting
  • Hold steady longer
  • Try from different angle
  • Manual entry as fallback

Camera Quality Issues

Blurry or Unfocused Images

Causes:

  • Dirty camera lens
  • Autofocus not working
  • Too close to subject
  • Low light conditions
  • Camera hardware issue

Solutions:

Clean the lens:

  • Use soft, lint-free cloth
  • Gently wipe camera lens
  • Remove fingerprints and smudges

Improve focus:

  • Tap on subject to focus
  • Move slightly closer or farther
  • Ensure adequate lighting
  • Hold phone steady

Poor Lighting

Issues caused:

  • Can't see barcode clearly
  • Photos too dark
  • Scanner can't read code
  • Autofocus struggles

Solutions:

  • Move to brighter area
  • Use natural light if possible
  • Turn on room lights
  • Avoid backlighting
  • Use phone flashlight if needed

Advanced Troubleshooting

Restart Your iPhone

When to try:

  • App restart didn't help
  • Camera works in other apps but not Sunu
  • Permissions are correct but camera still fails

How to restart:

iPhone X and later:

  1. Press and hold volume button + side button
  2. Slide to power off
  3. Wait 30 seconds
  4. Press side button to turn back on

iPhone 8 and earlier:

  1. Press and hold top/side button
  2. Slide to power off
  3. Wait 30 seconds
  4. Press button to turn back on

Check for iOS Updates

Outdated iOS can cause issues:

Step 1: Settings > General > Software Update

Step 2: Install any available updates

Step 3: Restart iPhone after update

Step 4: Try camera in Sunu again

Check for App Updates

Outdated app may have bugs:

Step 1: Open App Store

Step 2: Tap your profile icon

Step 3: Scroll to find Sunu

Step 4: Tap "Update" if available

Step 5: Try camera again after update

Reinstall the App

As a last resort:

Step 1: Delete Sunu from iPhone

Step 2: Restart iPhone

Step 3: Reinstall from App Store

Step 4: Sign in

Step 5: Grant camera permission when prompted

Step 6: Test camera functionality

Note: This preserves your account data but resets local preferences.

Alternative Solutions

If Camera Won't Work

Manual entry options:

For meals:

  • Log meal without photo
  • Add food items by name
  • Manually enter nutrition

For medications:

  • Log dose without barcode
  • Select medication from list
  • Enter time manually

For barcoded products:

  • Type product name
  • Search in app database
  • Add manually with details

Device-Specific Issues

Camera Hardware Problems

Signs of hardware issue:

  • Camera doesn't work in ANY app
  • Black screen when opening camera
  • Camera app crashes immediately
  • Physical damage to camera lens

Solutions:

  • Visit Apple Store or authorized repair center
  • Check if under warranty
  • May need camera module replacement
  • Contact Apple Support

iOS Camera Permissions Bug

Rare iOS bug:

  • Permissions show "on" but don't work
  • Affects multiple apps
  • Usually after iOS update

Fix:

Step 1: Settings > Screen Time > Content & Privacy Restrictions

Step 2: Ensure "Allowed"

Step 3: If restricted, temporarily disable Screen Time

Step 4: Re-enable camera for Sunu

Step 5: Re-enable Screen Time if desired

Testing Camera Functionality

Verify Camera Works

Test in other apps:

  • Open default Camera app
  • Take a test photo
  • Try barcode scanner in other app
  • Use FaceTime/video call

If camera works elsewhere:

  • Issue is likely with Sunu specifically
  • Check Sunu's permissions
  • Try reinstalling Sunu

If camera doesn't work anywhere:

  • Hardware or iOS issue
  • Not Sunu-specific
  • Contact Apple Support

Reporting Persistent Issues

If Nothing Works

Before contacting support, note:

  • iPhone model and iOS version
  • Steps you've already tried
  • When the issue started
  • Whether camera works in other apps
  • Any error messages

Contact support with:

  • Detailed description
  • Screenshots if possible
  • Screen recording of the issue
  • List of troubleshooting steps attempted

🔦 Lighting Tip

Most barcode and photo issues are related to lighting. If having trouble, move to a well-lit area or point phone toward a light source (but avoid direct glare on barcodes). Natural daylight works best for food photos.

📷 Permission Check

The #1 cause of camera issues is permissions. Always double-check Settings > Sunu > Camera is enabled. This simple step resolves 80% of camera problems.