Re: My floating balloon plans
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Just a couple things. You mentioned that you need a micro USB cable for programming. I don't know if they've changed the FTDI breakout board or not, but the one I have has a mini USB.
I mentioned earlier that I would take one of my pro minis into work and weigh it. It looks like the one I have left has some screw terminals soldered onto it. So I won't be able to weigh it. But you can probably handle that yourself now that you have parts in hand.
Speaking of my pro mini with screw terminals, how are you prototyping? Connecting the pro mini to the breadboard, or using an uno? You could borrow mine if you want for prototyping. It is a 5V version though.
Depending on where you come in for weight, you might want to consider pulling unnecessary components off the arduino. You can get by without the reset button and the LED along with its resistor. It won't be a lot of weight savings, but when you're talking grams it can all add up. I couldn't remember if I mentioned it or not.
On Jun 6, 2017 10:29 PM, "Jared Smith" <jared@...
I'd be happy to have you duplicate (or, better yet, improve upon) what I'm doing. If others are interested, it would make sense to combine orders to save on shipping. I'd be happy to coordinate this if others want to give it a go.
Most of the links to what I've purchased are in my Notes document - https://docs.google.com/document/d/1Es1rbg2a9rPM2AEG23-Rvfko8uyDNknSzF_th0O7MnU/edit?usp=sharing
You'd need to purchase the following:
- Arduino Pro Mini ($10 - be sure to get the Arduino version, not a clone)
- FTDI breakout module ($10 - only need 1 for programming)
- Si5351A Clock Generator with TCXO ($15 plus $4 for their SMA End Launch Connectors)
- GPS (~$25 plus shipping from the UK)
- Supercapacitors ($4.81 each - need 2 per flight)
I have extras of most everything else you'd need and am happy to share:
- Solar panels - I bought a pack of 100. They are tiny, thin, and very delicate. We'll need 8-10 per flight.
- Solar panel tabbing wire (for soldering the panels in series)
- 36 AWG magnet wire for antenna. The minimum I could buy is 3193 feet!
- Fishing line for tether
- TMP36 Temp sensors
- Schottke Diodes (they came in a pack of 50. I bought SMT chips - I'm not sure if/how I'll wire them yet)
- SMA Dummy load for testing
You'll also need basic Arduino programming/wiring components (micro USB cable, breadboard, jumpers, wire, etc.). And SMA adapters (mated to whatever End Launch Connectors you get) to plug into a 20m antenna for testing. I also bought a cheap high accuracy scale - http://a.co/8fD1Fnu
I'm still not sure how I'm going to put everything together on the payload. My current thinking is to mount on a small sheet of coroplast or styrofoam. I just need to balance it so the panels face up.
I'd hate for you to get too far along on this if my plan isn't a solid one, but I should know in a week or so if it's going to work. If you want, you could do an APRS version instead of, or in addition to, WSPR. You could also do JT9 or JT65 by changing just a couple variables.
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