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Topic: Outdoor tracking (Read 2 times) previous topic - next topic

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  ;)

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