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 Surveyor but support may be added in the future.
Power
The RTK Surveyor has a built in 1000mAh battery and consumes approximately 240mA worst case with Bluetooth
connection active, GNSS fully tracking, and a 500mW radio broadcasting. This will allow for 4 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 Surveyor.
The RTK Surveyor 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. A green LED indicates > 50% charge remaining. A yellow LED
indicates > 10% charge remaining. A red LED indicates less than 10% charge remaining.
Hardware Overview - Advanced Features
The RTK Surveyor is a hacker’s delight. Under the hood of the RTK Surveyor is an ESP32 WROOM connected to
a ZED-F9P as well as some peripheral hardware (LiPo fuel gauge, microSD, etc). It is programmed in Arduino and
can be tailored by the end user to fit their needs.
Click on the image to get a closer look at the Schematic!
ZED-F9P GNSS Receiver
The ZED-F9P GNSS receiver is configured over I C and uses two UARTs to output NMEA (UART1) and
input/output RTCM (UART2).
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