5.2 LED Status Troubleshooting

Table 5-1. Application LED Troubleshooting
LED SequenceDescriptionDiagnosisAction
All LEDs are OFFBoard is not programmedDownload the image .hex file from GitHub or the AVR-IoT website
Only Red LED is ONIndicates a hardware fault issue with the development boardWith debug option enabled in MCC, connect to serial terminal and pass the command ‘debug 4’. This will print out the log indicating the cause of the error.
Blue LED BLINKS slowly (at 0.5s rate) with all other LEDs OFFBoard is in Soft AP mode
  • Connect to the board using a phone or a network capable device
  • Send updated credentials via Soft AP
Blue LED BLINKS quickly (at 0.25s rate) with all other LEDs OFFBoard is not connected to an access point and trying to connect.
  • Verify the access point credentials
  • Verify if the access point is online
Green LED is BLINKING; Blue LED is also BLINKING quickly (at 0.25s rate)Board is using WiFi DEFAULT CREDENTIALS
  • Allow board to connect to Access Point
  • Update CREDENTIALS through CLI if DEFAULTS selection was invalid
Blue LED is ON, Green LED is BLINKING

Board is not connected to the Google Cloud Servers
  • Verify MQTT required ports
  • Verify project credentials
  • Check local network firewall settings
  • Use tethered cell phone or laptop connection for internet
Blue and Green LEDs are ON but Yellow LED is OFF

Sensor data is not being published to Cloud
  • Verify device registration to the project
  • Check Google account settings

Blue and Green LEDs are ON. Yellow LED is BLINKING.

Everything is working
  • No action required
OR

Blue and Green LEDs are ON. Yellow LED held high/low.

Subscribe topic toggle value received
  • Nothing to do
  • LED will reflect ‘Toggle’ value LED behavior returns to normal after HOLD PERIOD
Table 5-2. PKOB nano LED Troubleshooting
LED SequenceDescriptionDiagnosisAction

PKOB nano LED is OFF

Board is not powered
  • Check the USB connection
  • Replace the board

PKOB nano LED is ON but CURIOSITY driver is not found

Faulty USB connection
  • Check the PC device manager
  • Replace the USB cable
PKoB nano LED is blinkingDebugger is workingNo action required. Refer to the AVR-IoT Wx Hardware User Guide for more details.