This is the promised Video about the vieHAB-1 Hardware. It has lots of problems, mainly everything was made into one system. In the end we had no SD logging because the atmega328 didn’t have enough memory. Our friends from STS-project already solved this with using a secondary processor with an SD card.
I will make a new system with seperated functions and better power supply. This time I will take every time it needs ti make it (this time we had a fixed date and wanted to get this going :))
It was finally done! The whole setup reached a total height of 36000 m (118000 ft).
We set off at 00:15 from Vienna and reached Povozany (SK) at 02:15. After a bit of socializing with our slovakian friends from STS Project I set off to make the radio work and do some other bits in software.
Launch was at 06:45 Local.
Have fun with the flightvideo:
I’ll have some more next week on the hardware itself,
So first we got the bare board, etched with NaPS and toner transfer:
The whole thing is kinda like a mainboard, processor socket and expansion cards:
Boards in place from left to right: Arduino, SPI-level shifter, RFM22B on breakout board and a SD-card holder:
On the top added: a voltage divider for battery voltage, UBLOX GPS receiver, LM317 for 3,3V (RFM,SD):
This I really love: from bradboard to etched without a hitch:
There will be another chip flying with us: a tiny85 to reset the arduino every 5 minutes or so. It will reinit GPS and rfm and so on. Also it will turn off the photo and video cams to save power after landing.
I have rebuilt Anthony Stirks Interrupt Driven RTTY TX Demo to do it without interrupts 😀
Right now I’m just happy that I made RTTY work, there is still some work to do, like setting transmission power according to flight state (pre-launch, launch and landed). Landed will be especially funky, because it will lower its output power in three stages, then a beeper beeps and leds will light up.
Still to do is a reset circuit, SD-Card saving and the v2 Motherboard.
Thank you OE1HWS for lending me your FT-817!
PS.: The xp on the netbook is there to play Rollercoaster Tycoon, still my second favourite game!
PPS.: The first being Transport Tycoon ;D
I basically spent the whole day figuring out the librarys little quirks. The DHT22 lib had a case issue (dht.h != DHT.h). Just got my first responses from the spi controlled RFM22B, I will hook up the sd card tomorrow and set up a filesystem on it.
I’ve been quiet for some time again becaus I became a member of the vieHAB Project. It was started about 4 years ago by Erwin (OE1FEA) but remained dorment for the most of this time. We met at the monthly Metafunk amateur radio meeting where I attended a course to get my ham radio license.
Basically I wanted to do such a project for a long time but never got around doing it. So I jumped the opportunity and became hardware guy. The whole project will be published as OSHW. For our first start vieHAB-1 we will use ready to use modules like an arduino and ublox gps on breakout boards with a backplane.
It is planned to have 2 cams, 2 temperature and preassure sensors, 2m and 70cm radio, GPS and SD-card on board for the first start. I will keep you posted on progress every now and then.