sparkfun RTK Express Hook-Up Manual page 11

TIM-TM2
TIM-TP
TIM-VRFY
RTCM3x-1005
RTCM3x-1074
RTCM3x-1077
RTCM3x-1084
RTCM3x-1087
RTCM3x-1094
RTCM3x-1097
RTCM3x-1124
RTCM3x-1127
RTCM3x-1230
RTCM3x-4072-0
RTCM3x-4072-1
Qwiic:
This 4-pin Qwiic connector exposes the I2C bus of the ESP32 WROOM module. Currently, there is no firmware
support for adding I2C devices to the RTK Express but support may be added in the future.
Power
The RTK Express has a built in 1300mAh battery and consumes approximately 240mA worst case with Bluetooth
connection active, GNSS fully tracking, and a 500mW radio broadcasting. This will allow for around 5.5 hours of
use in the field. If more time is needed in the field a standard USB power bank can be attached. If a 10,000mAh
bank is attached one can estimate 30 hours of run time assuming 25% is lost to efficiencies of the power bank and
charge circuit within RTK Express.
The RTK Express can be charged from any USB port or adapter. The charge circuit is rated for 1000mA so USB
2.0 ports will charge at 500mA and USB 3.0+ ports will charge at 1A.
To quickly view the state of charge, turn on the unit. The battery icon will indicate the following:
3 bars: >75% capacity remain
2 bars: >50% capacity remain
1 bar: >25% capacity remain
0 bars: <25% capacity remain