In this section, we'll go over how to connect to the SparkFun RTK EVK.
To take advantage of the LTE cellular network with the LARA-R6, you will need to connect to the two LTE antennas on the back panel. Insert the LTE Hinged External Antenna into the SMA connector labeled as Cell 1 and rotate the threaded connector until it is finger tight. Repeat for the other SMA connector labeled as Cell 2. You will need to adjust the antenna as necessary depending on where you mount the RTK EVK.
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| LTE Cellular Antenna | LTE Cellular Antenna Ports Highlighted |
Of course, you will need to connect an active multi-band GNSS antenna to the RTK EVK. We recommend using the L1/L2/L5 Surveying Antenna (SPK6618H) that is included with the kit. This covers the L1 and L2 band for the ZED-F9P. This also includes a built-in ground plane to provide the best performance for GNSS. This antenna will also provide broad coverage of the L-Band for the correction signals. Insert the SMA connector from the interface cable to the SMA connector labeled as GNSS. Tighten the hex nut until it is finger tight. Connect the TNC connector side from the interface cable to the to the SPK6618H antenna. Tighten the threaded connector until it is finger tight.
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| GNSS Antenna Port Highlighted | Cable | Survey Antenna |
You will need to mount the antenna in an area where it gest the best view of the sky (we recommend the roof). There is mounting hardware where you can permanently mount the antenna to a structure or support. There is also a magnetic mount to attach to a metal structure as well. For the scope of this tutorial, we will not go over the details of installing the antenna.
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| Cable Connected and Survey Antenna Mounted on Magnetic Stand |
For WiFi and Bluetooth using the ESP32, you will need to connect the 2.4GHz Duck Antenna to the RPSMA connector labeled as ESP32. Insert the antenna into the RPSMA connector and tighten the threaded connector until it is finger tight.
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| WiFi/Bluetooth Connector Highlighted | WiFi/Bluetooth Antenna |
!!! note For users that need an extension cable to mount the antenna to a location that is farther away from the RTK EVK, you could use the Interface Cable - RP-SMA Male to RP-SMA Female (10M, RG58).
For users that are connecting Ethernet or using power from the PoE, you will need to connect the Ethernet cable between the RTK EVK and your PoE network switch. Insert the Ethernet cable to the RJ45 MagJack connector until you hear a click. Then insert the other end into the network switch.
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| Ethernet Port Highlighted | Ethernet Cable |
You can connect to the ESP32 by inserting the USB-C connector into the port labeled as CONFIG ESP32 and inserting the other end of the cable to your computer's USB port. This will power the RTK EVK, allow you to upload custom code, manually update the firmware binaries, or connect to a serial terminal.
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| USB CONFIG ESP32 Port Highlighted | USB C Cable |
You can connect to the ZED-F9P, NEO-D9S, or LARA-R6 by inserting the USB-C connector into the port labeled as CONFIG UBLOX and inserting the other end to your computer's USB port. This will power the RTK EVK and allow you to connect the modules to u-center or m-center (for the LARA-R6).
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| USB CONFIG ESP32 Port Highlighted | USB C Cable |
To insert a microSD card, slide the microSD card into the microSD socket until it clicks in place. Pushing the microSD card again will eject the memory card.
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| MicroSD Card Port Highlighted | MicroSD Card |
!!!note ####Activate Your Hologram SIM If you're using a SIM card from Hologram, you'll need to follow a few quick steps to activate your SIM card.
- Log in to your Hologram account, or create one.
- Click the blue + Activate SIM button in the upper-right-corner of your Dashboard.
- Select your plan – in most cases “Maker Flexible” is the way to go, but you can upgrade.
- Enter your SIM card’s CCID. This number can be found printed on both your nano-SIM card and in the larger digits below the bar code. Then select continue.
- Next you can decide whether to enable auto-refill or not and continue. Finally, you’ll be greeted with a summary page – hit “Activate” and you’re ready to go!
For more help activating your Hologram SIM card, check out their Connect Your Device documentation.
To take advantage of the LARA-R6, insert the nano SIM card into the nano SIM socket until it clicks. In this case, we used a Hologram card. Insert the SIM with the contacts facing down, insert the edge with the chamfered corner first.
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| Nano SIM Card Socket Highlighted | Nano SIM Card |
!!!note You will need to remove the nano SIM card from the 3-in-1 SIM card holder when you initially receive the Hologram card. Just "punch" out the pre-cut nano SIM card size out by pushing it out with your fingers. Make sure to avoid touching the gold contacts with your bare hands.
To connect to a pin on the screw terminal block, insert a stripped wire of any length into the I/O screw terminal. Of course, you could use jumper wires with pins as well. Secure the wire by tightening the screw using a precision 2.5mm flathead screw driver. Test the connection by gently pulling the wires to ensure that they are secure.
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| Wire Inserted into I/O and Screw Being Tightened |
If necessary, users can remove the terminal block off by wiggling the connector or using a spudger. When ready, users can slide the I/O terminal block back into the socket.
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| I/O Screw Terminal Block Removed |
!!! tip Don't have spudger? A good substitute includes a flathead screw driver, plastic card, or the PCB ruler. Using a tool will make it easier to remove the I/O terminal block.
Users can connect a radio transceiver to the ZED-F9P UART2 port for correction data. We recommend using a breadboard to JST-GHR-06V cable to connect the SiK Telemetry Radio. Note that the cable is included with the LoRaSerial Kit.
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<a href="https://www.sparkfun.com/products/19032">
<b>SiK Telemetry Radio V3 - 915MHz, 100mW</b>
<br />
WRL-19032
</a>
For users with the using a telemetry radio, you will need to connect the UART pins and ground to the screw terminal block. Note that this connection is only for the serial UART connection. To power, we recommend using an external 5V voltage source since 5V is not broken out. While there is a 3V3 pin available, the voltage will not be enough to fully power the radio module. One method is connecting a micro-B USB cable and 5V USB wall adapter to the Telemetry Radio.
| RTK EVK UART Pinout |
Telemetry UART Pinout |
|---|---|
| ZED TX2 | RX |
| ZED RX2 | TX |
| GND | GND |
For users with the LoRaSerial, you will also be connecting the UART pins and ground to the screw terminal block. To power, we also recommend using an external 5V voltage source for power such as a USB C cable and 5V USB wall adapter.
| RTK EVK UART Pinout |
LoRaSerial UART Pinout |
|---|---|
| ZED TX2 | RXI |
| ZED RX2 | TXO |
| GND | GND |
There are various PTHs throughout the PCB. Most are used with the testbeds for quality control but they are available for you to connect! For temporary connections to the PTHs, you could use IC hooks to test out the pins. However, you'll need to solder headers or wires of your choice to the board for a secure connection. You can choose between header pins and jumper wires, or stripping wire and soldering the wire directly to the board.
