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R5639 User Manual
مجموعة مستخدمي أوراكل العربية

A full-screen app on your home screen with push notifications, badges and more.

To install this app on iOS and iPadOS
  1. Tap the Share icon in Safari
  2. Scroll the menu and tap Add to Home Screen.
  3. Tap Add in the top-right corner.
To install this app on Android
  1. Tap the 3-dot menu (⋮) in the top-right corner of the browser.
  2. Tap Add to Home screen or Install app.
  3. Confirm by tapping Install.

R5639 User Manual __hot__

| Symptom | Likely Cause | Solution | |---------|--------------|----------| | Unit does not power on | Dead batteries, faulty USB cable | Replace 18650 cells; test USB with another device | | Erratic temperature readings | Condensation inside sensor cavity | Place in dry, 40°C environment for 12 hours | | Bluetooth not pairing | Old cached pairing | On your phone, "Forget" the R5639 and re-pair. PIN 0000 | | Logging stops prematurely | SD card full or write-protected | Format SD card; unlock the physical tab | | Screen shows "Sensor error" | Internal sensor communication failure | Power cycle. If persists, return for service | | LoRaWAN join fails | Incorrect keys or poor coverage | Verify DevEUI/AppKey; move closer to gateway |

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