Ogre; a color-coordinated NXT "tank"
Most of the times my creations are poorly color-coordinated; I just use whatever parts I need functionally and don't worry about how it looks. But with the black NXT (in other words, with an option), I started thinking more about how to utilize the color. While I like the white/gray color scheme, the darker pallet had me thinking more along the lines of a zamor shooter... and I already had the mechanism, and enough dark studless parts...
Thus was born Ogre:
The four zamor launchers can fire a little over 9 balls each second, with a large "tray" on the top that feeds about 50 of them and allows for easy reloading. The tank treads have the upper point of the triangle "sprung"... the tension on the tread is maintained by a LEGO shock, so that the treads do not have any slack in them (and when going over a bump, the treads can "stretch" slightly to compensate). It doesn't use any NXT motors (after all, they didn't go with the color scheme), instead driving the treads and the launcher using the PF XL motors. This gives it a nice easy way to run it as well: with the NXT off, Ogre can be remote controlled using two stock PF remotes. But turn on the black NXT, and it can control the entire vehicle using the Hitechnic IRLink, in a fully autonomous mode where it can "hunt" for isolated targets, center on them, and then launch a volley of spheres while advancing towards the target (and disengaging when the target is no longer present). Another fun aspect is a small spy cam mounted to one side. With that, both remote control an dautonomous modes are a lot more fun as you "ride along" on Ogre as it roams across the countryside. Or, well, the living room.
Originally I wasn't sure of the black NXT. And for functionality, after all, a regular NXT does have the same feature set. But after playing around with it, it has given me some ideas for different color schemes, something that has always been rather lacking before: after all, the RCX had just one color (one I liked, but still... only one).
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Brian Davis
Thus was born Ogre:
The four zamor launchers can fire a little over 9 balls each second, with a large "tray" on the top that feeds about 50 of them and allows for easy reloading. The tank treads have the upper point of the triangle "sprung"... the tension on the tread is maintained by a LEGO shock, so that the treads do not have any slack in them (and when going over a bump, the treads can "stretch" slightly to compensate). It doesn't use any NXT motors (after all, they didn't go with the color scheme), instead driving the treads and the launcher using the PF XL motors. This gives it a nice easy way to run it as well: with the NXT off, Ogre can be remote controlled using two stock PF remotes. But turn on the black NXT, and it can control the entire vehicle using the Hitechnic IRLink, in a fully autonomous mode where it can "hunt" for isolated targets, center on them, and then launch a volley of spheres while advancing towards the target (and disengaging when the target is no longer present). Another fun aspect is a small spy cam mounted to one side. With that, both remote control an dautonomous modes are a lot more fun as you "ride along" on Ogre as it roams across the countryside. Or, well, the living room.
Originally I wasn't sure of the black NXT. And for functionality, after all, a regular NXT does have the same feature set. But after playing around with it, it has given me some ideas for different color schemes, something that has always been rather lacking before: after all, the RCX had just one color (one I liked, but still... only one).
--
Brian Davis
Comments
Thanks for sharing a very entertaining video
can you use the camera to scan for targets instead of the US sensor? then i could identify colors(friends and enemies).
In the long run, I suspect that the cat/robot war will be resolved when the cats start developing robots against us. I keep the NXTs carefully separated from our cats, just in case...
What an impressive beast!
/MP
By the way, I suppose the real menace for mankind is the cats teaming up with the robots against us in the end ... ;)
On the other hand, the cats don't need to - they rule us already anyway. :)
But my money's on the cats:
Diet: 100% protein
Immune System: Can drink pond water and eat rotting animals and only get stronger from it.
General Design Goals: Walking weapon
Stealth: Silent to sound sensor and virtually invisible to ultrasonic sensor
Hearing: Can hear NXT motors from probably 1 mile away
Vision: Well beyond useful ambient light threshold of light sensor, and, er, a little more than than 1 pixel.
Allies: Has human race well-trained to serve them.
Boot-up Time: Sleeping to chop-licking victory in 0.5 seconds.
Speed: By the time it triggers the touch sensor, it's way too late.
The robots may have a chance... :)
http://www.youtube.com/watch?v=Pk7yqlTMvp8
dilip: I could use a camera, but (a) I don't have one, and (b) it's still difficult to get it to reconize a "target" this way, given the variety of colors in the background, the different shapes, etc. Not impossible, but not within the hardware solutions I currently have available.
Clgfive: blog away - we put this stuff out there for public consumption. The balls are called "Zamor spheres", and they have a couple of different style launchers - the older one (the looks a little like a three-fingered hand) is much easier to use in a robot. You could probably get them off Bricklink or something similar, although they are in some of the recent Bionicle sets (but you have to look carefully to see which type of launcher you are getting). The Black NXT is the same as a regular NXT "under the hood", and I think the package only comes with the Black NXT and some special media - not a bunch of LEGO parts.
And on a completely separate subject... Ill never be able to say "herding cats" with a straight face again. Thanks, Dave :).