Nigel Goodwin

You can't send standard serial data over an RF link, basically because it's AC coupled - usually manchester coding is used, but you are quite free to invent your own :lol:

They will transmit variable width pulses, again though, within the constraints of their AC coupling - you would need to experiment. The more expensive ones come 'ready to use', with a pre-programmed PIC doing all the work for you.

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Roboticinfo

go to www.rentron.com

they have a transmiter/reciever that connects to a computer
the total cost for both would be 120 to 130usd not bad at all.

Plus free software.

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Boris

Hi!!!!!
I found very good transmiter and reciver on site: www.linxtechnologies.com
Price very low.

Roboticinfo

Ya but it is easier to interface with the computer using the rentron tx/rx even though they contain parts from linx.

It all depends on time wise.

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bloody-orc

ok well i chose SC-P tranciever module from linxtechnologies.com
is it any good? is it "smart" (inside coding) what and when do i send to it? can i communicate wit it via i2c? or serout?

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Nigel Goodwin

A quick look at the datasheet doesn't mention anything about encoding, but it doesn't mention that it's required either?. It's possible that the module doesn't require NRZ (None Return to Zero) data signals?, and it does give suggestions about the construction of 'packets' to send through the system.

You simply use a serial connection, I2C isn't relevent to this type of system.

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bloody-orc

ok i red the data and seems wery good
i think i will get that for my birghday if i do the exams OK

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kshitij_anshu

u may read electronics for u of may2006 it wil b help

bingbinICE

You can design a RAM7 board and burn Linux kernel into it.

1) Linux Kernel support some webcam such as Webcam of Ov511 chip

2)You can also cross compile an Open Source Video Server for RAM, The Video server have ability to send your video which is captured by your webcam to Upper computer

3) you can cross compile an USB Wi-fi driver for ARM

bingbinICE

For simpler, You can chose a Wireless USB hub for your goal. Ultra-Wideband (UWB)Wireless Hub is a new technology of USB interface thch.

you can get more info from:
http://www.yedata.com/news/image/060829.pdf



Saitama, Japan, August, 29, 2006 -- Y-E DATA, Inc. (Headquarters: 182 Shinkoh, Irumashi,
Saitama, representative director president, Mr.Kaneyuki Hamada) announced the
development of ‘ UWB Wireless Hub, YD-300 ‘, in collaboration with Wisair. The ‘UWB
Wireless Hub, YD-300 ’ will be available for the market in October, 2006.
The YD-300 consists of a host-dongle and a wireless hub with 4 USB ports. It provides
the wireless transmission of data between a PC and existing wired USB devices such as
HDD, DVD, mouse, keyboard, printer, digital camera and so on. The YD-300, by
eliminating cables, frees up space around the PC with wireless technology and ensures a
comfortable environment for PC users. In addition, this solution enables a wireless portreplicater
with ease for notebook-type PC.

Key Features
Up to 480 Mbps air data rates
Up to 10 meters operating distance
Compatible with Windows XP
4 USB port hub
Host Dongle: 29.8(W), 96.2(D), 9.4(H) mm
Hub: 103(W), 79.5(D), 19(H) mm
NewsRelease
Y-E Data Inc.
182 Shinkou Iruma Saitama Japan
In the near future, Y-E DATA will provide solutions with the ‘Certified Wireless USB’
technology of USB Implementers Forum, Inc., as well as PCI Express interface solutions.
These will include, for instance, an ExpressCard/34 host card and PCI Express Mini Card,
to expand the possibilities of wireless technology.

justDIY

sorry, I'm late to the party!

The goal - transmit video wireless from robot to remote laptop?

The solution - 802.11b camera:

http://www.trendnet.com/en/products/TV-IP100W.htm

that one is about "middle of the road" for features and pricing.

you'll need 802.11b/g on your laptop, and will probably need to setup the camera via wired connection first, but then it should stay configured, ready to go on adventures with the robot. it only needs 5vdc, which any good microcontroller powered robot should have in abundance right?

the thing to look for if you decide to purchase on of these - make sure it supports ADHOC networking, so you don't have to lug along a wireless access point if you go out in the field. I like this model because it has an external antenna, which you can replace with something more powerful.

EDIT:

oh, just re-read the original message, you want RX and TX ... well, sending video is a lot harder than sending telemetry. Does your laptop have bluetooth? You could use a bluetooth serial module to carry the telemetry, or any of the other small serial data radio modules. Even 9600 baud can carry a lot of data. If your hacking skills are good, you might be able to tap into the camera's software and processor some how. The wifi camera's processor probably has some sort of uart interface in it - exposing the correct pins should be a matter of some data sheet digging, exposing it in software will be the challenge. Others may have hacked a wifi camera already, laying the groundwork for you.

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want to contact me directly? gmail gordonthree
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Favorite numbers:
09 F9 11 02 9D 74 E3 5B D8 41 56 C5 63 56 88 C0

Pommie

This thread is 30 months old!!

Mike.

justDIY

oh my, well not too relevant anymore I suppose

guess I didn't notice the time stamp on the original posts, just the latest posts from the newbies.

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want to contact me directly? gmail gordonthree
check out my project website: http://projects.dimension-x.net
Favorite numbers:
09 F9 11 02 9D 74 E3 5B D8 41 56 C5 63 56 88 C0

blueroomelectronics

Threads from the crypt.

I often read the ancient threads and when the reality/complexity/cost of the project becomes clear... Poof end of thread.

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architmh

this thread is 2 old.....u can do tthis wid a wifi and bluetooth in ur system wid a bit of programming...