Flextrak is a PiZero form factor AVR based High Altitude Balloon Tracker.

This board has a GPS receiver and radio transmitter designed for tracking high altitude balloon flights utilising a Raspberry Pi Zero W. An optional APRS board/cut down board will be available soon.

You will get :

• FlexTrak Board
• Battery holder + clip
  
• 4 x 11mm Standoffs with screws to attach to the Pi+
• Standard non stacking low profile header
• RG174 Tail for making into an antenna see this article.
• Pi Zero W Board with Camera Cable (Camera not supplied - please order separately)
• 32Gb SD Card preloaded with FlexTrak code.
  
  

The board is supplied with a 434/868 or 915 MHz LoRa radio transmitter   To track the location of flight you also need a suitable radio receiver, aerial and PC on the ground.  To can be tracked with a mobile phone connected to our LoRaGo device.

It features:

• Efficient built-in power regulator providing run time of over 20 hours from 4 Energizer Lithium Ultimate AA cells
• Highly sensitive UBlox GPS receiver suitable for altitudes up to 50km
• Temperature sensor
  
• Battery voltage monitoring
• Allows use of Raspberry Pi camera
  
• Mounting holes and spacers for a solid connection to the Pi
• Tracker will continue to work even if the Raspberry Pi fails. 

The open-source software provides these features:

• Radio telemetry with GPS and sensor data using UKHAS standard
• Radio image download using SSDV standard
• Multi-threaded to maximize use of the radio bandwidth
• Variable image size according to altitude
• Stores full-definition images as well as smaller transmitted images
• Automatically chooses better images for download
• Supplied as github repository with instruction
  
• Optional APRS transmission with additional hardware.
• Optional external temperature probe (Available soon)

Weight Breakdown:

Flextrak Board          -  16g

Header + Standoffs  -  14g
Battery Holder+Clip     -  13g
PiZeroW + Cable          -    14g

Not supplied for information only:
Energizer L91 Lithium (AA)  - 14.5g x 4

Instruction Manual: https://store.uputronics.com/files/FlexTrak_Manual.pdf