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2 hours ascension
32 km high
19 mn of descent
65 km traveled
-Is it ready ? -No, the camera is missing
-This is missing too, a lot of stuff is missing
-Hold it well !
-Say goodbye to it, Say goodbye to it !
-A message to those who will find this video, please, send us...
-You saw how we struggled...
-I think it must be high -here it is
-It is here ?
-Well, here we go then
-Then, it is here
-Tell me where it is -Sartrouville, juste above sartrouville
-Perhaps we could see it !
After filming for 1:30 the GoPro shuts down halfway
About 20Km high
-Where is it ?
-It is right next to us
-It is above Chevreuse
-We're here... -In trappes
-Hey it's cool, here we go
Approximately 32Km high
After receving its GPS coordinates We recovered the payload in the groung
-Yes, that's it !
-The camera sees us coming !
-Ahh the camera is smashed !
-Crape, but it is on landing, it does no matter
-It landed 50 meters from the highway !
-Let's open the gift package
-It is tangled, look
-The GPS chip has held on
-The GoPro has stopped, out of battery i think
-Yes the battery is dead
-Is the hand warmer still hot ?
-Look the GPS is still working
-Well, it worked well
-This part of the video shows all the technical aspects of the project and all the anecdotes we had
-I speak to people who want to know more
-I'll split this video in 4 parts
-Firstly the design of the payload
-Second, embedded electronic in the payload
-thirdly, the data decoding and reception equipment
-Fourthly, the anecdotes of the day and all the difficulties we had because on the video it is not as easy as you think
-For the payload, is a polystyrene board covered with a foil blanket to keep the heat inside
-There was also a hand warmer to increase the heat
-According to received data, here on the temperature curves can be seen in red the outside temperature
-The inside temperature in blue
-When the temperature approaches -60 °, we can see that with the hand warmer and insulation the internal temperature drops to just below 0 °
-For this it was very cient
-The payload is equipped with an antenna, surrounded in foam, here
-To increase the range of radio transmission
-It appears here on the BNC connector
-For video, here you can put a gopro
-The Electronic part is based on a Arduino Nano microcontroller, it is connected to a circuit board that I devised
-There are different sensors
-2 temperature sensors
-One with an extension cord, measuring the outside temperature
-One other set on the electronic board for measuring the temperature inside
here, a GPS with its antenna, to receive GPS coordinates in real time
-There is also a second GPS it is a tracker that works via the mobile phone network, we put a SIM card inside and it send us the GPS coordinates by SMS.
-The drawback of this GPS is its maximum operating altitude, limited to 18Km, a drawback the other GPS does not have
-The problem of radio transmission is that it falls to a hundred meter if it there are obstacles between us and the payload
-The idea is to follow the payload with this GPS when it is in altitude and to use this GPS when the payload is on the ground
-There is a differential pressure sensor
-It measures the pressure difference between these two inputs,
-The idea is to block one of the pipes on the ground to allow to compare the pressure trapped in the pipe and the one outside the payload
-Except that in theory the idea was good, but in the programming of the sensor there was an error and the pressure data sent was completely wrong
-this means that the pressure goes down to -57hPa and remains blocked, so totally wrong
-So all these data are sent to the ground through the radio module "NTX-2 434Hhz"
-Which is connected to the antenna of the payload through the BNC connector
-And all these data, as well as sent by radio, are stored on this memory card
-It which recorded in to a text file all the data from the various sensors
-For the third part the software and hardware used to receive real-time GPS coordinates
-A 434Mhz yagy antenna
-the antenna is connected to yupiteru radio receiver
-The audio output of the radio is connected to the microphone input of the PC
-This is the fldigi software, there it is already configured to decode the data
-We can see the example of a tram that we were getting in the car
-Time, latitude, longitude, GPS altitude , pressure, altitude calculated from pressure, indoor temperature, outdoor temperature
-And finally I'll just tell you a few anecdotes and about a difficulty we had in the day !
-the first problem we had was on the ground search for the payload
-We did receive an SMS from the tracker, except that it said GPS OFF
-It took it 4 hours to find GPS signal...
-So for 4 hours we drove around, we traveled the countryside randomly hoping to see it in the middle of a field
-After these 4h we received the GPS coordinates of the fall
-Except that ! And yes something else happened, it would have been too easy if not!
-When we arrived near the field we immediately saw something shiny in the middle, we rushed over
- ...but in fact it was just an inflatable pink pony !
-In the end we did recovere it, even after all these problems !
-Projects for the future would be a second space balloon, an improved version
-Especially with extended batteries for the GoPro because it was a pity not to see the maximum altitude
-I hope you enjoyed the video, feel free to ask me some questions in the comments and subscribe to follow my future projects