Picture from the edge of space – Design

(This post is a work in progress for the moment., It will be updated as my design evolves)

Balloon

Materials

  • 800gm Weather Balloon
  • N10 Helium Canister

Flight

With some help from CURF‘s predictor looks like the balloon will travel for around

  • 2 hours 30mins
  • Cover about 300km (Going about 75 mph!)

This of course, is based the weather on the day, I should run the predictor a few times,

Payload

Boxing

  • EVA foam, its lightweight, and I can work with it to shape it into what I need.
  • Paracord for the ropping

Controller Parts

Power

This is still an on going question, though it looks like lithium AA battries, connected up to provide 5V.

Wiring plan

 

GPIO Pins

Header Pin PI Usage Allocated for
1 3.3 BMP180 – VIN
2 5v
3 I2C/SDA1 BMP180 -SDA
4 5v
5 I2c/SCL1 BMP180 -SCL
8 TXD0 SOR -TX
9 Gnd BMP180 -GND
10 Rxd0 SOR -RX
14 Gnd SOR -GND
15 GEN SOR – DTR
17 3.3 SOR -3Vo

USB

I cant wire the GPS module in as I would like as it used the Tx/Rx pins just as the radio does. SO I am going to wire it to a USB interface and connect to it as TTL device. The model I am using just outputs string, that I can read in like a console.

Tracking

I know I am going to use Habitat, I still need to get to grips with it, so far as I can see it works like this:
GPS -> Pi -> Radio -> Your laptop in the car (or a helpful station you pass) -> To the internet -> Then Habitat updates its space tracker.

Final Budget and

 

Item Source Price
Balloon
800g Balloon  Link 45
Helium 70
Tracker
Raspberry Pi Link 36
Radio RT Link 10
GPS Module Link 34
Barometric module Link 8
Camera Link 17
UART USB Converter Link 6
Breakout 40pin + cable Link 5
BreadBoard Link 8
BatteryPack Link 15
Total 254

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