Initially I will use two different sensors for obstacle avoidance. lidar for closer range 2D image of space (obscale avoidance, scanning ground before landing, maybe SLAM)
and laser rangefinder for long range 1D distance sensing (looking for high buildings, maintaining altitude precisely, maybe high speed obstacle avoidance)
I went with cheapo robopeak hobby lidar, which seems to work well, here is a git repo for the library (node and beaglebone) (I also considered a lightweight hokuyo lidar) and for laser range finder I'll go with something like SF02 from paralax
these might be used in combination with some simple IR or just cameras (need more CPU but could double as optical flow sensors) used to locate becaons for landing or grabbing things
Ideally, both sensors should have an unobstructed front view on pitch dimension, with aditional unobstructed jaw dimension for LIDAR. Both sensors need to be able to independantly rotate on pitch axis for compensation of the angle of the drone when flying, and for scanning up and down (going in through windows, looking down when landing, etc) maybe rangefinder should also rotate on jaw axis on some fast servos for looking around independant of the drone orientation. not sure yet.
IR and ultrasound were also options, they are cheap but tricky and unreliable, (ultrasound behaves extra badly due to propeller noise on drones) These things can be compensated for, but laser rangefinding will always afaik give more accuracy and reliability at a price.
people often ask me why I own a drone, what is it for, and then half of the time they say that I could use it to record weddings and get some cash flowin'
If mention of recording weddings doesn't kill all my will for conversation, I'll say drones are so simple to make these days that I find it hard to justify not owning one. also, at the time there is no regulation and no one ever counts on you owning a flying robot, so its a sweet spot to own one. a drone is a flying sidekick, it can, in theory, do whatever a flying sidekick can do. it can enter through windows and steal jewlery with its tiny robot hands. Sounds ridicilous but technically it is not hard to do. In the following years we'll have to rethink space and what can be done, and before that happens, I get to be a kind of a superhero.
today, drones are very primitive. I'll fix some parts that I care about. and if I make anything useful, Im guessing drone related kickstarter projects would be welcome.
a few ideas,
few concrete things to work on, sorted by priority
this is a lot of work, but none of it is far fetched and all of this will be done soon, if not by me, then by someone else
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