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Tiny4FSK

Reliable high-altitude tracking system using the Horus Binary v2 protocol

max-kendallMax Kendall
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Tiny4FSK is an extensible high-altitude balloon flight computer with built-in tracking using the Horus Binary v2 tracking system.
Tiny4FSK uses:
- the SAMD21 microcontroller, which is an ARM Cortex-M0+ MCU
- the TPS61200 boost converter, which is adjusted to output 3.3v
- Si4063 radio module, which I use on the 70cm band
- ATGM336H gps module - pretty cheap GPS module which works in airborne mode (>18km)
- integrated BME280 temperature, pressure, and humidity sensor
The code uses the Arduino framework to make it accessible to beginners

This project was graciously sponsored by PCBWay. They provide low-cost PCB fabrication and assembly services. The pictured PCBs were fully assembled by PCBWay's services! Check them out at https://www.pcbway.com/.
  • 1 × SAMD21G18A
  • 1 × Si4063 Application Specific ICs / Telecom ICs
  • 1 × TPS61200 Power Management ICs / Battery Management ICs
  • 1 × ATGM336H GPS module
  • 1 × BME280 Temperature, Pressure, and Humidity Sensor

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Adam Wakelin wrote 01/12/2026 at 07:02 • point

Hey Max,

Just took a look at your project page and your GitHub. You are doing some awesome work and I can't wait to see what you make next! If you aren't already registered, I would recommend studying for a HAM Radio License. It's a really great way to learn about radio technology and goes hand-in-hand with your work on weather balloons.

  Are you sure? yes | no

Max Kendall wrote 01/12/2026 at 23:45 • point

Hey Adam!

I'm an amateur extra :p thanks for the thought though! I agree completely, it's a great way to learn more about radio electronics, especially with the extra material (which helped me through much of this project!)

-Max

  Are you sure? yes | no

Adam Wakelin wrote 01/13/2026 at 06:27 • point

Ha, that's awesome! I had a feeling that you were either just really advanced with radio or you were already a HAM, especially when you dropped lingo like the "70 cm band". I was going to take my General and Extra exams but just never got around to it. Maybe one day!

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