User's Guide

Firmware
# Mode LED
1 Connecting White breathing
2 Waiting for user
association
Yellow breathing
3 Environment data
only
Blue breathing
4 GPS Searching Purple breathing
5
Connected
GPS fix Green breathing
6 Low Battery Red slow breathing
7 Error Red fast breathing
Table 2: Nordic Thingy:91 Operating modes and LED indications
4.3 GPS
Nordic Thingy:91 has GPS which, if activated, allows the device to be located globally using GPS signals.
• To activate GPS long press button SW3 (> 10 seconds) until the LED starts breathing purple. The LED
starts breathing green when a GPS fix is achieved, and it starts breathing purple again when GPS is
active and searching.
• To turn off GPS long press button SW3 (> 10 seconds) until the LED starts breathing blue.
4.4 LTE Band Lock
The modem within Nordic Thingy:91 can be configured to use specific LTE bands by using the band lock AT
command.
The pre-flashed firmware configures the modem to use the bands currently certified on the Nordic
Thingy:91 hardware. The bands to enable can be configured when compiling the firmware. For more
information see:
• Band lock AT command
• nRF Connect SDK Band Lock
4.5 LTE-M / NB-IoT switching
Nordic Thingy:91 has a multimode modem which enables it to support automatic switching between LTE-
M and NB-IoT.
A built-in parameter in the Nordic Thingy:91 firmware determines whether the modem first attempts to
connect in LTE-M or NB-IoT mode. If the modem fails to connect using this preferred mode within the
default timeout period (10 minutes), the modem switches to the other mode.
4418_1336 v1.2
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