How to send a balloon into space?

balloon-project-julio-1

This is a guest post from Julio Cesar Torres. He sent a balloon to space after learning about electronics! Read his captivating story below:

When I was a kid, I was always eager for Sunday morning, just waiting for the time to watch Carl Sagan’s “Cosmos” on TV.

Back then, my couch turned into a spacecraft and I could go to places light-years distant from home. All was discovery and astonishment.

One thing that got me mostly surprised was to know that the Earth had multiple atmospheric layers, and contrary to common sense, there are upper layers that are hotter than the lower ones. This always caught my imagination, and I have been fascinated by this kind of subject ever since.

After many years, I got to know a hobby that put me in direct contact with this childhood passion: High Altitude Balloonism, a.k.a. HAB. It is a hobby where people send unmanned aircraft into the stratosphere to take pictures and videos, gather scientific data, having a pretty good time preparing for the missions.

It is an opportunity to learn a lot while we have tons of fun.

One of the skills most needed in HAB is electronics: to design and build the flight instruments, the data logging modules, and integrate with radio communication, cameras, and GPS. I wanted badly to be able to carry out these tasks, create my own balloon mission, and reach the stratosphere.

But I hadn’t enough electronics skills to successfully create these devices.

Searching the web I found Oyvind’s ebook «Creating Cheap Circuit Boards», and that was kind of an epiphany to me – the simple techniques he taught in that ebook, from the idea to the finished circuit (fabricated PCBs included) enabled me to adventure in my childhood’s desire: get near the space…

Aleph FDR v.1 board

The Aleph Flight Data Recorder Project

In this project, I have adopted an iterative development strategy. The first iteration will be about creating the circuit’s base and including an RTC clock and an onboard temperature sensor. I am going to focus mostly on circuit design and implementation, and in another article, I will talk about the software design and engineering process.

As I learned from Oyvind’s ebook, Getting Started With Electronics, I can use the component’s datasheet to discover important information, such as the voltage, temperature limits, and most important of all, a schematic of the typical circuit.

I got DS1307’s and LM35’s datasheets, and there I got the schematics for their typical circuits. These layouts are pretty straightforward, and my main job was to integrate these two little circuits into one layout and set a way for the board to communicate with the Arduino microcontroller.

So I started out hand-drawing the two schematics and connecting them to the supply lines. For both these integrated circuits, the input voltage is +5V. So they could share the input voltage and the ground. I also added an LED indicator, to show me when my circuit is on. I finally drew the connection from these components to a male header bus, to connect the board to the microcontroller.

Aleph FDR v.1 schematics

With this schematic in hand, I drew it in Eagle and generated the circuit board to send to a fabrication facility. There are plenty of fabrication services out there, which are not expensive and suit well for a hobby project like this one. You can find some suggestions in Oyvind’s article Cheap PCB Design Process.

Aleph FDR v.1 board

Some important “extra” things I decided to put in my layout:

First, I wanted to draw a ground plane, to make all components share a common reference potential, but also to simplify the traces’ routing, by connecting each component’s ground directly to the ground plane.

Another thing I wanted to include was the mounting hole spots. In my prior experiences with a PCB design the thing that I regretted the most was not having a spot to mount my boards – so I had to improvise, and I hated the results I got from this… :)

Further steps

I am now looking forward to the next iterations of The Aleph Near Space Project, and some of the things I am planning to incorporate are:

  • Add new sensors to the circuit: external temperature, air humidity, air pressure, altitude, magnetic field, etc;
  • Store data in SD Cards;
  • Software’s parameter storage in EEPROM;
  • LED/OLED display;
  • Solar cell or LiPo battery powering options;
  • Wifi config interfaces;
  • design an Arduino clone in the circuit board, to have autonomous life without the extra microcontroller board!

Well, for the first iteration, that’s all I’ve got to tell. If you are interested in the outcome of this project, or if you would like to get involved in it, you are very welcome to contact me – please, send an email to [email protected]

And here is the link to the github-page with the schematics and firmware: https://github.com/juliozohar/Aleph-Flight-Data-Recorder

Thanks a lot!

More Maker Lifestyle Tutorials

7 thoughts on “How to send a balloon into space?”

  1. Claude,

    Thanks for the comment. I think you would like a lot the follow-up on this project. Just keep in touch!

    Cheers,

    Julio

    Reply
    • Hello Dhritiman,

      I am so glad the you liked the post and it has inspired you to build some electronics too! Find some interesting ideia, gather the information for building it (this site is full of them) and just have fun!

      And I am looking to hear about your projects!

      See you!

      Reply
    • Hey Allu,

      how are you doing my friend? In fact it is used in plenty of others projects around the world. I just took the courage to learn electronics and build my own, with my specs, instead of getting someone else’s. This is the power electronics gave me :)

      I hope you also give form to your marvellous ideias building electronics!

      Reply

Leave a Comment