“Project HoHoHo I”
Buy a balloon, put helium in. Attach a camera, and let it go, then pick it up when it lands! Sounds easy? It is! We put a GPS device in the balloon, that broadcasted its location through radiosignals so we knew where it was during flight. So we picked it up from the ijsselmeer, where it landed. It taped video and took many pictures on its journey through 32km of atmosphere. It’s result is displayed below.
First a picture!
Tracked it with GPS, that we picked up in the car with a radio, and got an sms from the payload when it splashed down in the middle of the ijsselmeer. Asked someone for a boat, and chased the payload, and found it, still making pictures! Hence the pictures here..
If you have Google Earth you can download this file
|Launch||01-08-2010 (11:35 GMT+1), Heiloo, Northern Holland (Netherlands)|
|Max. Altitude||31.300 meter|
|Contents||Sensors, Flightcomputer (x1), GPS (x2), Camera (x3)|
|# Pictures||700 Pictures|
|# Video||111 min + 61 min|
OK Time to watch the video that sums it all up. Don’t hesitate to drop a comment! You can leave a comment at the bottom of this page, or per picture individually!
Scroll down for pictures and movies!
How it works:
Red=Did not work Green=Worked
|Canon A720IS||Videotaped for 1:30 hours|
|Canon A560||Took >700 pictures in 3:00 hours|
|Spycam Keychain HD||Videotaped 58min|
|Parachute||Worked but tangled|
|Radio||Radiometrix NTX2-10mW @ 434.650MHz RTTY 50b, 7n1, 350Hz shift|
|GPS||Tyco Vinotech Sirf III (from Libelium)|
|GPS||Falcom FSA03 (ublox)|
|Flightcomputer||Arduino Mega (1280)|
Raw Video 10/12 (~30km):
Raw Video 2/12 (~5km):
Raw Video from the $7 spycam taped on the side:
All 700 pictures stitched into a video:
First telemetry after release
Last Telemetry before crash
Duration: 60+27+25=112 minutes
Autoreboot after spashdown/crash:
Float duration in water: 58 minutes
The formula for the Light Value in the bottom graph is from the camera. (It’s like EV but it takes ISO in account). I had absolutely no idea what exposure you need in “space”, so i set it to automatic. It turns out an EV of around 14 would be best (for instance 1/500 f5.6 ISO100).
Special thanks to: Wouter Dasselaar, the driver of the Pollo; Daniela for filming, Daniel Richman for helping with the code; Terry Baume and Richard Harrison for code snippets, Jon Sowman for setting the tracker; the UKHAS (UK High Altitude Society) team for advice and support and tracking/listening in; CUSF (Cambridge University Space Flight) for hosting the tracker and all that.]]>