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Electronics / can someone recomment a good flying robot?(read please)
« Last post by shimi19801 on Today at 09:06:46 AM »
can someone resommend where to buy a small(as small as a bug like the military one's) flying robot with solar cells or somthing similar that can transfer images to my pc?

even a project page to such a robot can be good...

imm also willing to buy such a flying robot from someone

thanks in advance
Electronics / Re: Help with sensors for a Chess Board/Pieces
« Last post by bdeuell on Yesterday at 09:20:04 PM »
Instead of trying to identify each piece uniquely you could just identify if a piece is located on that space. Using this method you would detect when a piece is removed from the board and where it is placed. The computer would see a piece disappear and then a piece appear in a new location. It would then make the assumption that this is the same piece and that was your move. At the beginning of the game the computer would identify each piece based on its location. The computer would keep track of the identity of each piece throughout the game. Yes this is not as robust and error proof as identifying each piece uniquely but assuming you follow the rules of the game it should be sufficient. Picking up more than one piece would break this method.

As for sensors:

Hall Effect sensors are a good choice. The sensor can be placed below the board and can be covered by the board as long as it is not too thick. They can be used to detect a magnet placed in the bottom of the game piece. Or you can place a magnet behind the sensor and move a piece of ferrous metal into the field of the magnet, (many hall effect sensors are designed with a magnet as part of the sensor assembly).

light sensors (IR or visible) could be used similarly but would require holes in the board for the sensor to see through. For that reason these would not be my first choice.

A camera is certainly an option but would be heavier on the programming side. You could start "simple" with just identify if a piece is on a space and then work up to identifying the pieces if desired. Lighting may be necessary to get consistent results from the camera. Also keep in mind the robot would be moving within the cameras field of view.

Mechanics and Construction / Re: Looking to learn where to start
« Last post by Schlayer on Yesterday at 04:29:20 PM »
    If I were you, I'd forgo a micro controller altogether. You need to control two drive motors via remote control, and that is easily accomplished with a simple 2 channel radio receiver and transmitter. I agree with bdeuell on several of his points:
From my understanding of your mobility requirements it doesn't seem like treads are necessary, you could probably get away with some wheels, they would need to be large enough and have some traction. Of course tracked robots can be very cool and if that is what you want to build it isn't the wrong choice...wheels are just simpler. The most basic robot construction is probably two driven wheels and a caster.
As for motors you will probably want something geared.
    Geared motors are pretty useful, as with a remote controlled vehicle it's incredibly simple to operate them. I can't see a reason to use steppers, as that just adds a PWM component and complicates things. You could easily use a two joystick controller with two sub-$10 bidirectional speed controllers and two cheap gear motors, a ~$50 transmitter/receiver kit, and then be pretty much done with all of your electronics. Usually digital transmitters can be bought at a moderate price and give you a massive amount of control over an R/C system. You can get a $20-$30 analog controller instead, though I personally haven't found a 2 joystick transmitter for surface vehicles under $60.

Digital: http://www.rakuten.com/prod/neewer-fs-gt3b-2-4g-transmitter-w-receiver-combo-fly-sky-3ch-rc-car/276213605.html?listingId=380080984&sclid=pla_google_NeewerDirect&adid=29963&gclid=CjwKEAiAoo2mBRD20fvvlojj5jsSJABMSc7jeqFyoUR-shy0hms1x-pHGpNdxQlb2agrIuRhHbngyxoCp9Lw_wcB (This I've used personally and it can be used to control differential drive vehicles like you would a traditional car, with a steering wheel and throttle)

    Alternatively, you could use one motor to drive an axel on which you have both rear wheels, and mount your castor to a servo for steering, allowing easier use of the pistol grip transmitters like this: http://www.amazon.com/FS-GT2-Transmitter-Channels-Receiver-channels/dp/B007FSJM6S/ref=sr_1_1?ie=UTF8&qid=1422138401&sr=8-1&keywords=rc+car+transmitter
(FlySky just happens to sell transmitter + receiver kits that are easy to find and fairly inexpensive)
Electronics / Re: Help with sensors for a Chess Board/Pieces
« Last post by Tommy on January 23, 2015, 06:43:42 PM »
Could anyone offer my any advice on how they would approach this problem?
paddymcd93, I'd point a webcam at the board, then use software to detect both the peace being moved,
and it's color.   

Misc / Re: "real" microcontrollers
« Last post by mklrobo on January 23, 2015, 02:50:23 PM »
 :) Hello!
Parallax has made the propeller chip, and has succeeded in many  applications. The propeller has
8 MCUs on one chip, each can do 20 MIPS. Multitasking is performed via each MCU, or COG. Alot of
people use the propeller from industry to amateur. I have played with the propeller, and it is
program friendly, with lots of support on their forum.
Microcontrollers of this scale are usually dedicated; but the versitilty of the Parallax Propeller
sets it apart, and breaks the chains of usual scalability. A visit to the site would be worth your while! ;D
Electronics / Re: Help with sensors for a Chess Board/Pieces
« Last post by mklrobo on January 23, 2015, 02:40:47 PM »
 :) Hello!
I would offer an opinion.....
In reference to the magnets, to keep it simple.
Each chesspiece has a maximum of 6 magnets, all round, and
installed in the bottom of the piece. Each magnet has a specific place,
and the model for all pieces are the same.
The arrangement of the magnets trip the reed switches, when moved to
each spot. (each peice has a max of 6 magnets, and EVERY spot has 6 reed
switches or hall effect transistors-- for sensing)
The position of the magnets identify the part by a bianary code, 6 spots = 62 pieces.
(may have to add more)
All pieces have to stay forward, so they can be identified correctly. (turning them can
cause them to be wrongly identified.)
This is ALOT of magnets, and ALOT of sensors.
It would be easier to have each piece transmit data.(infrared, RF, etc) to identify
each piece. (infrared through the board, via glass hole.)
I hope this helped!  Good Luck!   ;D
Mechanics and Construction / Re: Looking to learn where to start
« Last post by mklrobo on January 23, 2015, 01:42:16 PM »
 :) Hello!
I would suggest investing time into programming the servos, along with identifying some
schematics. Parallax has some good starting robots, with manuals for basic programming.
The Avon microcontroller seems to be user friendly, with built in commands that take the headache
out of getting servos to work, with the interface worked out. Good luck!
Mechanics and Construction / Re: Motor Identification
« Last post by mklrobo on January 23, 2015, 01:37:22 PM »
 :) Hello!
Parallax has done some work with this type of robot. It might be a good thing
to look them up. Good luck!   :)
Mechanics and Construction / Re: Printrbot simple metal with E3D v6 HotEnd
« Last post by mklrobo on January 23, 2015, 01:35:32 PM »
I have no idea of what you are doing, but sounds cool!  :)
Can you provide more details?
Mechanics and Construction / Re: sheet metal to make a plank?
« Last post by mklrobo on January 23, 2015, 01:33:46 PM »
 :) Glad to offer my opinion!
I would suggest to use a model from the automotive industry;
They can use a thinner metal, just bent. Bending the metal
can add strength to the  plank, without adding more metal, which
causes more weight. I try to approach solving these types of problems
by observing real world applications, then adapting those to my
needs. (After all, those inventors already did the work!  ;)  )
Good luck!
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