Wireless communication between robots

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#1
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Hey :)
I have plans for building some small robots (say 3x5x3 cm)
and they will run inside a limited zone (5x5m)
I need to have two-way communication.. and for later purpose I want to send low-ress pictures from one robot to the master PC...
The robots will be working a little like the "ant-bots" small swarm robots...

But but but.. I need some good ideas for communication..
My thoughts are on IRDA, RFM12 or something new if any ?
What would you guys choice based on my limited information ?

uC's: Atmega16, 32, 64, 128 and Attiny13
Lang.: C
Interests: Small scale robots AND sensor monitoring system

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any one ?...
Maybe some with experience on IRDA ? range, baud rate and so on, in a living room environment

uC's: Atmega16, 32, 64, 128 and Attiny13
Lang.: C
Interests: Small scale robots AND sensor monitoring system

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I'd use the nRF24L01+. Low-cost ($4) modules are available.

Leon Heller G1HSM

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You could try the radios available here: http://vlaurie.com/computers2/Articles/environment.htm

I just purchased a pair of these: http://www.pololu.com/catalog/product/1336 but have not had a chance to test them yet. I think they would be a good choice because they are addressable.

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nRF24L01 looks really nice ! :D

and "Someguy22" looks also nice, but thinks the nRF24L01
is my answer :D

But another thing...
does any of you, know how the range is if we say i placed one of them inside a fishtank.. in the water ?

uC's: Atmega16, 32, 64, 128 and Attiny13
Lang.: C
Interests: Small scale robots AND sensor monitoring system

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Bump

B4Me wrote:

But another thing...
does any of you, know how the range is if we say i placed one of them inside a fishtank.. in the water ?

uC's: Atmega16, 32, 64, 128 and Attiny13
Lang.: C
Interests: Small scale robots AND sensor monitoring system

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Minimal

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Place antenna above water..built flexible cable from robot to surface antenna.

Alcatel did it for diving HP communication.

Jeckson

NB:Submarine at sea surface for high speed communication. Below surface with VLF communication(that's need huge antenna and KWatt's power).

.

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Just had an idea... what about going infrared in the water, and RF outside ? :) then have en link just outside the tank which goes from the one to the other

uC's: Atmega16, 32, 64, 128 and Attiny13
Lang.: C
Interests: Small scale robots AND sensor monitoring system

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Ultrasound is another option.

Leon Heller G1HSM

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How would fish do with the ultra sonic sound ? :-/
Dont wanna harm/irritate them (more than the u-boat would do)

uC's: Atmega16, 32, 64, 128 and Attiny13
Lang.: C
Interests: Small scale robots AND sensor monitoring system

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Devise an experiment. Equipment required: hydrophone, signal generator and amplifier, Clear lake or large aquariun with fish. Procedure: Observe fish response to tone burst in hydrophone. If response is a rapid movement due to being startled, we can conclude they can feel or hear the tone, and it startles them. Repeat the experiment with an ultrasonic range transducer. Do fish hear? Over what freq range?

Imagecraft compiler user

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Maybe im just being stupid here :)
but maybe I just should stay with the IR idea, and have an external RF link

uC's: Atmega16, 32, 64, 128 and Attiny13
Lang.: C
Interests: Small scale robots AND sensor monitoring system

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I get annoyed with posters that ask for advice, wait for responses and THEN say something like, "OH! I forgot, the battery needs to work at absolute zero." Sheesh.. If it needs to work underwater, why not say so in the first place? It seems this happens almost every time I respond to a question.

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Someguy22:
I have bought a couple of the nRF24L01 from the start of my post.. and the thing about under water, was as a result of a idea I got half way through, this doesn't mean that I didn't listening to the thing everybody wrote ?
My main problem where an wireless communication solution for small robots... the extra idea was to build a small sub for my aquarium :)

Why so angry ? its not like I destroyed your life ? I just got a extra idea an used the same thread buddy :-/

uC's: Atmega16, 32, 64, 128 and Attiny13
Lang.: C
Interests: Small scale robots AND sensor monitoring system

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Quote:
I have bought a couple of the nRF24L01 from the start of my post.. and the thing about under water, was as a result of a idea I got half way through, this doesn't mean that I didn't listening to the thing everybody wrote ?
My main problem where an wireless communication solution for small robots

Submerge <<HF

the nRF24L01 can't work except my suggest before.

Jeckson

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Quote:
but maybe I just should stay with the IR idea, and have an external RF link

This might be a stupid question... How to fish react to infra red light ?

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I, actually dont know... but they swim in low water (in nature) so I think they have the same spectrum of light in theres visible spectrum.. so they cant see it (I suppose)

uC's: Atmega16, 32, 64, 128 and Attiny13
Lang.: C
Interests: Small scale robots AND sensor monitoring system

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Hai...B4me

I just suggest.

You could built VLF transmitter telemetri with closed loop antenna(to made portable).only 1-5 watts TX enough.

The fish which had small VLF receiver with attiny to decode telemtri.

Used like QPSK modulation as direction of "fish movement" and "what fish you control".

FEC maybe as error correction transmission.

Jeckson

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Hehe yeah okay :) but I dont wanna track fish, just control a mini submarine :)

uC's: Atmega16, 32, 64, 128 and Attiny13
Lang.: C
Interests: Small scale robots AND sensor monitoring system