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Re: [Paparazzi-devel] Discussion point around toss and fly drone


From: Michal Podhradsky
Subject: Re: [Paparazzi-devel] Discussion point around toss and fly drone
Date: Mon, 24 Aug 2015 11:45:17 -0700

Hello David,

it is truly an impressive video. But it is a promo video, so I would imagine that not every single time it takes off so flawlessly and they used the "best" shots only. (here is the link btw https://www.lily.camera/)

I don't think anybody tried it with Paparazzi, although it is possible. IMU/AHRS can initialize very quickly, and you don't necessarily need to initialize it levelled. One example would be external AHRS/INS devices, such as GX3 or Vectornav, which give you orientation quickly after startup (I assume they use gravity vector as a reference). Lily will have some cheaper solution, probably even the very same sensors as Lisa board. So the "only" missing part would be a better AHRS algorithm that doesn't need a long initialization.

I don't know about the GPS - maybe you can get some "fast" lock, although I doubt it. Maybe Lily flies without GPS just in altitude hold (barometer) until it gets a lock. The wrist control device is connected via bluetooth - so maybe some kind of RSSI is used to guide the copter while it waits for GPS lock.

Anyway, if the company delivers what they promise, it will be a cool product in a reasonable price range.

That's my 2 cents:)
M

On Wed, Aug 19, 2015 at 6:24 AM, David Conger <address@hidden> wrote:
Hello, I hope everyone is having a good Summer. I start this
discussion because I am often interacting with people who consider a
MAV for a business or research etc. It seems the "Holy Grail" to have
something that can power on and fly (even just hover in place) with
zero setup. The follow a GPS dongle is also something I can see many
uses for (following wildlife or toss the dongle into the sea and let
the current carry it etc).
I saw a surprising drone video for "Lily". A feature is no setup just
take it out and toss it to fly. Video seems to support this.
Interestingly in this discussion list I remember someone asking about
just this for their Paparazzi quadrotor.
How is this possible to take Lily out of a backpack, power on (not
even level on the ground), then toss it and it recovers and flies? How
will Lily know about magnetic variation? GPS fix? Level attitude so
quickly?
It seems an interesting discussion because in all these years I have
never seen anything like this or thought it possible, then again
things are only impossible until they are done no?
Has anyone done such a thing with Paparazzi based multi-rotors?
Cheers,
David B Conger

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