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Yeah see if you can get through without tripping any detectors.
Cool. Yes, I think we do have a glue gun.
I've ordered some laser diodes and some LDRs which will hopefully be here by Wednesday. Do you know if you need to use a resistor with a laser diode (lime with and led)?
I've not really done much googling on them, but I keep seeing people referring to laser diode drivers?
On 19 January 2015 10:04:56 Damian Axford <dam...@axford.me.uk> wrote:
I also have some IR reflectance sensors - might be possible to arrange them in a grid/circle and detect a copter going past.... would be very quick to prototype, so will try to remember them for wednesday. Do we have a hot glue gun at the hackspace?
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Based on the door cards at work angle doesn't matter. But yeah read speed and distance from sensor could be an issue.
Though maybe that's a different challenge, fly up to the sensor and hover close enough for long enough to activate it and light up your led. Have a few of them spread around the room. First person to light up all their LEDs wins :-)
The build begineth :-)
The build begineth :-)
<IMG_20150124_191626.jpg>
Looks like it should work, though I suspect positioning and getting the mirrors to stay in place and resist knocks might need to involve some got glue! (The wood is already a bit chewed up where I've been flying through :-) )
Laser is top left, ldr is top right. Pla glows in a really weird sparkly way under laser light.
On 24 January 2015 19:28:33 Robert Longbottom <Robe...@iname.com> wrote:
The build begineth :-)
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Looks like it should work, though I suspect positioning and getting the mirrors to stay in place and resist knocks might need to involve some got glue! (The wood is already a bit chewed up where I've been flying through :-) )
Laser is top left, ldr is top right. Pla glows in a really weird sparkly way under laser light.
<IMG_20150125_114029.jpg>
<IMG_20150125_114135.jpg>
On 24 January 2015 19:28:33 Robert Longbottom <Robe...@iname.com> wrote:
The build begineth :-)
<IMG_20150124_191626.jpg>
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Yeah, recessing them could work, though you still need a way to fasten them in place and the right place so it can resist knocks and the beam follows the right path. I'm thinking people going barrelling into the frame and knocking the whole thing over as well! :-)
They had circular mirrors in
hobbycraft which is where I got the square ones from, but I didn't look at
the price compared to square.
Made a bit more progress on this last night. The mirrors, "laser" and detector are now hot-glued in place :-). And I extended the cabling so it can connect to a nearby arduino. A short sketch of about 10lines of code (if that) shows that it works nicely and detects things passing through, reporting on the serial console for now.
Next steps are to add some LEDs, a buzzer, a counter, some other indicator, not sure what yet!
So last nights efforts in this involved trying out a piezo and another random buzzer I have to make some noise when someone goes through the gate. Turns out the piezo was waaay to quiet, but the other buzzer was pretty good. Most people seemed to be doing okay getting through the gate with their Hubsans and it took a fair old bashing with no real damage. Some laser realignment was required a few times after it was completely knocked over, and there are quite a few battle scars on the wooden parts from propellers. But all in all it survived okay.Short video here: https://www.youtube.com/watch?v=T8enpxFL2ro
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I suspect the two main issues will be:
Or if out doors, the wind might be a nuisance in more ways than one, playing havoc with both the sensor and the quads.
But I like the idea of enclosing the sensor inside a baffle box to reduce erroneous signals, and the gate becomes less physical and more "virtual" in a 3D printed physical sense, am I making sense? - NO!!
Now available on a thingiverse near you :-)
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A good nights work by the sound of it. I can't say I'm surprised about the sonar sensor being a bit rubbish. No you say about the 30cm thing, I'm sure I remember reading they don't work so well for close distances. Though 30cm isn't exactly close!
Pressure sensor pad sounds good
though. Hovering is very tricky with those little quads :-). I tried
hovering in my gate to go back and forth and trigger multiple detections,
no chance! The pressure sensor approach could work quite well for
bigger quads outdoors as well, so long as you can counteract the general
windyness of being outside.
Donald also brought in his RFID sensor and chips.This would be a great way to go for coptor recognition and individual laptimes, stats etc. However with this Arduino version, the pickup antenna just wasn't sensitive enough for a flyby scenario, you would virtually/actually have to land on the thing and then take off. The antenna would have to be in a protective box which wouldn't be an issue. I think the kit was about £40 (?) a pop so it is not really a cheap alternative, it would be uber cool though maybe just for the start finish/line?
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:-). Yes nice idea, but I did think that might be a bit dodgy having lasers randomly shining around. You'd have to be a pretty good pilot to get on target as well, unless you can find some way to spread out the laser beam or have a reasonably large diameter detector. Maybe a printed "clear" cone would direct the light down to the ldr in the weird sparkly way.
On a similar vein, I wonder if an IR led pulsed at a set frequency could be used to detect particular copters (different people use different frequencies). You'd have to overcome the problem of it reflecting off everything like ir remotes do, but maybe if you shielded the transmitter and detector in a similar way to either my gate or Damian's pressure sensor it could work. We could also try running at reduced voltage to shorten the range. Maybe more useful for a static target to fly up to that for shooting another copter out of the sky.
This isn't Facebook!!!! :-)
I'll be interested to see how
well the folding works while keeping the laser aligned.
OpenCV + raspberry pi + webcam was pretty easy when I had a go with that. Only a few lines of code to get a window onscreen with a live image.
Ill be interested to see if you can hover still enough for long enough for QR code reading to work. I guess if you have a sparse QR code so the blocks are big you might have some chance...
got OpenCV working, now installing zbar library... (brew install zbar)then to rip-off something that already works...
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