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Integration with Autopilots

Precis-BX305 board can be integrated with autopilots. In this article, the connecting to Pixhawk flight control is used as an example. A cable is used to connect the COM1 port of Precis-BX305 board and the GPS port of the Pixhawk. It is noticed that the GPS port need a 6pin PicoBlade connector while the COM1 port is a 5pin PicoBlade connector. The pin definition of the Pixhawk GPS port is listed in Table 1. 

With regarding to the power consumption, we recommend using external power sources. Please also pay attention to the baud rate setting of Pixhawk as the default baud rate of Precis-BX305 board is 115200. The Pixhawk can only recognize the NMEA sentence with GP NMEA talker. Incorrect NMEA talker configuration may cause connection failure.

Then you need to mount the GNSS antenna and tether the board on your vehicle. Please beware of following instructions when you mount the GNSS antenna to your drone.
■ Place the module on the outside of your vehicle (in an elevated position if appropriate) with a clear view of the sky
■ Distance the module from DC power wiring and the batteries by at least 10cm

Next step is setting up the Pixhawk with mission planner. Open Mission planner software and choose the right COM port on the top right corner. Choose 115200 as baud rate (default baud rate of Precis BX305 COM1 port). Then click ‘connect button’ on the right. Then the Precis-BX305 is recognized by mission planner if the GPS status becomes ‘3D Fix’.


Table 1. Pin definition of Pixhawk GPS port (from left to right)
Pin
Pin1
Pin2
Pin3
Pin4
Pin5
Pin6
Signal
VCC
TX
RX
CAN2 TX
CAN2 RX
GND
Voltage
+5V
+3.3V
+3.3V
+3.3V
+3.3V
GND


Figure 1. Demonstration of Integration with Pixhawk autopilot

If you have further questions, feel free to contact us to info@tersus-gnss.com or visit our official website www.tersus-gnss.com

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