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    README.md
    TFGPS01A - UAV GNSS navigation module with RTK capability
    


    ]]>Kicad - production files generator]]>  Slicing
    


    The TFGPS01A module is based on multi-constellation uBlox NEO-9 with integrated high-quality patch antenna. The module is capable of receiving GPS, GLONASS, Galileo and BeiDou navigation signals. It is designed primarily for use on small UAVs. Other uses are not excluded. Module can function as a standalone UART GPS or as a USB GPS receiver.
    


    The module has several features for UAVs. For example, it has a pass-through I2C port, payload interface, integrated beeper and safety LED or integrated connector for external safety switch and safety LED.
    


    



    


    TFGPS01 is commercially available from ]]>ThunderFly s.r.o.]]>, write an email to info@thunderfly.cz or shop at ]]>Tindie store]]>.
    


    Features
    


      

    • Compatibile with PX4, Ardupilot and most of common flight stacks
      • 

    • RTK capability (with NEO-M8P module)
      • 

    • Concurrent reception of 4 GNSS
      • 

    • Splitted interface for a Payload
      • 

    • CUAV V5/V5+/Nano compatible GPS&SAFETY connector
      • 

    • Integrated beeper and safety LED indicator
      • 

    • Extremely high noise imunity (IIP3 +8 dBm)
      • 

    • Daylight visible indicator LEDs
      • 

    


    Usage
    


    Caution
    


    The TFGPS01 is high-end and extremely sensitive device. The device must be handled with special care. The antenna ceramics and its silver plating is sensitive to acids contained in sweat, therefore touching on antenna should be avoided as possible.
    


    Compatible GNSS Reciever modules
    


    TFGPS01 is by default equipted with ]]>uBlox NEO-9]]> and high quality ]]>Taoglas]]> patch antenna.
    


    It could also be equipped with ]]>uBlox NEO-8]]> module, which has benefits in RTK capable GNSS receiver modes.
    


    High noise imunity
    


    The ThunderFly TFGPS01 GNSS receiver is optimized to work in RF noisy environment. This feature is achieved by use of high-linearity LNA at RF input.
The tradeoff of this optimalization is quite high power usage and lower sensitivity compared to standard receivers used in UAV.   Technically these parameters can be optimized for a specific use case by altering the R27 and R26 resistors.
    


    Hardware
    


    TFGPS01 is designed as Open-Hardware (GPL v3). All documentation is located in this repository.
    


    PCB
    


    



    


    Box
    


    To protect against external conditions, we have prepared a 3D printed box. The box is designed in OpenSCAD and it allows customization according to the use of reciemer and for the needs of mounting.
    


    
3D printed box

    


    Here are examples of various modifications of the box:
    


    
Example of UAV connectors TFGPS01 3D printed box
Example of USB TFGPS01 3D printed box

    


    Mechanical drawing
    


    
  
    TODO
    

    


    Diagram
    


    The TFGPS01 could be connected to the Autopilot and to the Payload at same time. The typical situation is in the following picture, where PPS timepulse signal is used by Payload measuring the pollution by dust. The similar, but a more robust configuration is used in the ]]>TF-ATMON system]]>.
    


    Typical connection of TFGPS01 to the autopilot and payload
    


    Eletronic schema
    


    Full schema is avialible in PDF
    


    schema
    


    LED description
    


    


    
  LED label
  Description

    
    


    
  ON
  Indicates 5V power in module

    

    
  ARM
  Safety LED from autopilot

    

    
  GEO
  Geofence status of uBlox

    

    
  RTK
  RTK status of uBlox

    

    
  TPL
  Timepulse from uBlox

    
    

    


    Pinout
    


    All connector are JST-GH.
    


    GPS&SAFETY
    


    Pinout of GPS&SAFETY connector conforms to the ]]>pixhawk hardware standard]]>
    


    


    
  pin
  Name
  Colour
  Description

    
    


    
  1
  Vcc (+5V)
  Red
  Power for module

    

    
  2
  RX
  Black
  Out from Autopilot

    

    
  3
  TX
  Black
  Out from TFGPS01A

    

    
  4
  I2C SCL
  White
  I2C1 clock from autopilot; Passtrought to I2C connector

    

    
  5
  I2C SDA
  Yellow
  I2C1 data from autopilot; Passtrought to I2C connector

    

    
  6
  SAFETY_IN
  Blue
  Safety switch IN

    

    
  7
  SAFETY_LED
  Blue
  Safety LED signal

    

    
  8
  VDD (+3v3)
  Blue
  Power for safety switch and safety LED

    

    
  9
  BUZZER
  Blue
  Signal for beeper

    

    
  10
  GND
  Black
  Ground

    
    

    


    I2C AUX
    


    I2C AUX is I2C1 output from the autopilot. No other device is connected to I2C.
    


    


    
  Pin
  Name

    
    


    
  1
  +5V

    

    
  2
  SCL

    

    
  3
  SDA

    

    
  4
  GND

    
    

    


    
  
    Pinout conforms to the ]]>pixhawk standard]]>
    

    


    Safety switch connector
    


    


    
  Pin
  Name
  Description

    
    


    
  1
  SAFETY_VCC
  +3.3V (low current)

    

    
  2
  SAFETY_LED
  

    

    
  3
  SAFETY_IN
  

    

    
  4
  BUZZER
  

    

    
  5
  +5V
  

    

    
  6
  GND
  

    
    

    


    Payload conector
    


    The module is equipped with a connector designed for payload connection; this feature is useful for time-sync and navigation data, time-stamping or geo-fencing.
    


    The connector is labelled as Payload GPS Interface.
    


    


    
  pin
  Name
  Description

    
    


    
  1
  TIMEPULSE
  Time-pulse signal from uBlox GNSS receiver

    

    
  2
  EXTINT
  Interrupt output from uBlox

    

    
  3
  GEO_STAT
  GeoStat output from uBlox

    

    
  4
  SDA
  I2C from uBlox

    

    
  5
  SCL
  I2C from uBlox

    

    
  6
  RX
  Rx of uBlox, parallel to the autopilot via a protective resistor

    

    
  7
  TX
  Tx of uBlox, parallel to the autopilot via a protective resistor

    

    
  8
  GND
  Autopilot GND

    
    

    


    USB-C
    


    USB is connected to the uBlox module, used for its configuration and testing. Configuration can be done via ]]>u-center]]> suite.
    


    Parameters
    


      

    • Dimensions 50x50x11mm
      • 

    • Weight 31g
      • 

    • Power consumption 40mA (without beeper in use)
      •
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