But once I caught him when he was open like Silenus' statues, and I had a glimpse of the figures he keeps hidden within: they were so godlike — so bright and beautiful, so utterly amazing — that I no longer had a choice: I just had to do whatever he told me.

Tag: balloon

First test of the balloon

Well, to be honest, I am very disappointed with it. I filled one balloon with hydrogen I obtained from reaction which occurred after mixing some sodium hydroxide dissolved in water with aluminium foil. Little displacement (about 5 grams) is probably caused by impure hydroxide which I used. At this moment buying that ingredient would be more problematic than buying whole bottle of helium so I decided to do it. While I’m waiting for the shipment I decided to do more tests, so tomorrow I’m going to use all supplies I’ve got to fill as many balloons as it will be possible. There is one more issue I need to consider. After buying these small balloons (30cm of width) I found on the Internet place where I can buy one that has 1 meter of diameter. I think of using two of them instead of plenty of these smaller. 


Raspberry Pi powering module

I’ve build a powering module for my balloon flight. This is how it looks:



To build the same you’ll need:

  • 1x LM7085
  • 1x 1000uF electrolytic capacitor
  • 2x 100nF ceramic capacitors

Schematics for that:


Well, it could be build better, 7805 is wasting some power, that is just the simplest way of building such device. You could use 6 AA batteries as well. When I checked voltage on TP1 and TP2 on RPi board it showed me ~4.90V value. Keep in mind fact that my battery is drained a bit.


EDIT 29-07-2012 19:47

Something about 10 minutes after connecting device I found out that 7805 is incredible hot, after next 5 minutes it stopped. To decrease temperature I mounted on it little radiator:

Now it’s good even when I’m putting it inside that box (these are outdated photos made before adding radiator):

As you probably noticed I’m powering device with 6xAA batteries instead of 1x9V battery. In this configuration I’m able to connect that Pentagram Wi-Fi modem and PS3 webcam, it’s working well.

Stationary balloon with Raspberry Pi (Part I)

Plan is simple. I’m going to mount RPi to a couple of balloons filled with hydrogen or helium (still not decided) and raise it 50 m above ground level. RPi will be connected to the Internet with 3g module and it will be streaming through it image from webcam. At this moment I’m gathering needed stuff.

I’ll need:

  • Raspberry Pi +
  • USB HUB powered by batteries –
  • Webcam +
  • 3g module – (I’ve got one but it’s not working on Raspbian, I’ll try on Arch)
  • Balloons –
  • Hydrogen (obtained in home way, I’ll show later how to do that) + / Helium –
  • 50 meters of thick fishing line

Photos of stuff I’ve already got:


Some electronical parts.


Mine Raspberry Pi with webcam that is working fine on it.

There’s a link to post with powering module: LINK.