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Topic: Outdoor tracking (Read 2537 times) previous topic - next topic

ThePulse

Hi All

Im new to arduino, but not to programming and electronics.

Im want to rebuild my motordriven golfbag to automaticly follow me around.

Do you have any ideas on how to do that?
My first idea was IR and an IR camera (maybe the wiimote ?)
But wouldnt the sun interfear ? (i dont want my golfbag to chase the sun ;) ) Maybe the ir sender could send a "code" that the reciever must recognise !?

any ideas on wich  "sensor" would be best?


Groove

If you took the heavy battery, motor and wheels off the device, you could sling it over your shoulder, and it is hard to imagine it following any closer than that.
Per Arduino ad Astra

sy kristina

I'm halfway through a golfbag project of my own. I'm using a wii made wireless to control the speed of the cart, and one of the buttons as cruise control.

Grumpy_Mike

#3
Sep 22, 2010, 11:32 am Last Edit: Sep 22, 2010, 11:33 am by Grumpy_Mike Reason: 1
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so the robot/bag knows to stop before running down the user

Oh Richard you have spoilt the surprise.  ;)

Yes the sun will be an issue with IR detectors. You could try modulated IR. The best solution could be a GPS receiver on your belt transmitting your position to the bag robot. Then the bag robot has a GPS so it knows where it is and then it can plot a course to you.

P.S. In the UK the term Bag Lady is used to describe a female tramp or bum. So the term Bag Robot might have different meanings in some parts of the world.

Groove

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Yes the sun will be an issue with IR detectors


Someone should have told this well-known, self-agrandising professor of cybernetics:
http://www.wired.com/culture/lifestyle/news/2000/09/38467
Per Arduino ad Astra

ThePulse

Yes i known that i can carry the bag, i can also walk to work and walk to the TV to change the channels! This is not a project i want to do because i am lazy (cough: i guess i am, but innovation is made by lazy people!)
This is a project i want to do because it is fun and challenging -> everybody can make a led blink........
And it has been done: http:// http://www.youtube.com/watch?v=_0XwJCllGnY

Problems with different sensors:
IR -> can be disturbed by the sun
Maybe some kind op blinking IR transmitter and the receiver should detect that "code" - and the direction could be 2 (or more) receivers separated by a plate parallel to the straight forward direction -> so that if the left receiver sees the signal, but not the right one the bag has to go left!
But my "worry" is that the IR receiver cant see the blinking IR transmitter, but only "sees" the sun!

ultra sound -> maybe not so good in rain and wind !

Gps -> expensive! and is it accurate enough? i meen what is best case 2,5 meters ?

 

Grumpy_Mike

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But my "worry" is that the IR receiver cant see the blinking IR transmitter, but only "sees" the sun!

By blinking do you mean modulated?

The ides is that the amplifier of the incoming IR signal is tuned and only amplifies the modulation. Of course that doesn't help you if the receiving sensor is saturated.

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Gps -> expensive

Yes
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i meen what is best case 2,5 meters ?

No much more accurate than that. You can get accuracy down to about 1cm. Then you trade off price for accuracy.

ThePulse

Hehe!

Yes! accuracy can be under 1 cm (with a price of 20k$)

In everyday GPS handheld units its about 4-6 meters!

Grumpy_Mike

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(with a price of 20k$)


Being ripped off here, don't need to spend more than $3k
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In everyday GPS handheld units its about 4-6 meters

Yes but you want relative accuracy not absolute accuracy in your application.

ThePulse

So they are 4-6 meters out in the absolute coordinate system, but more precise relative -> that was new to me!

How precise are the cheap gps units relatively?

And can you recomende one?
Remember i need 2 if i am going for that solution, so cheaper is better  ;)

ThePulse

So when i said that a GPS isen´t accurate enough it wasn´t untrue!

Hmmmmm! There must be some kind of "sensor" that can do the job!

pwillard

#11
Sep 22, 2010, 07:57 pm Last Edit: Sep 22, 2010, 07:57 pm by pwillard Reason: 1
You need to notify the general area that you have an autonomous golf bag with a mind of it's own... maybe you need to have it wear a T-SHIRT when it moves on its own.

Like maybe this:

Grumpy_Mike

The major causes of error in a GPS system is the difference in propagation through atmospheric cells. WSS compensates for this locally. I would disagree with what Richard said

AWOL

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A small child could do it

OTOH, an autonomous machine is unlikely to get bored and start hitting its sibling with the contents of said golf-bag
"Pete, it's a fool looks for logic in the chambers of the human heart." Ulysses Everett McGill.
Do not send technical questions via personal messaging - they will be ignored.

Justin_Tahoe_CA

LIDAR

http://www.youtube.com/watch?v=Z5pCmFYFW60

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