Wireless communication

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#1
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Hi guys

I need help finding a circuit for wireless communication. I want to be able to send/recieve wireless data at rather slow speed over a shorter distance using a simple protokoll. Does anyone know of a circuit that can give me this?

Regards, Ingemar

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any particular specs?

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Have a look at Nordic nRF401 Transceivers or others -> http://www.nvlsi.no

Small Chips with minimal external components and great specifications.

Or have a look at Atmels AVR's with build in RF Systems:
AT86RF211 or
AT86RF401[/list][/list]

Hava a look at my web page -> http://www.tobiscorner.at.tf

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Have a look at TRF6901 from TI. The EV kit is only 99 USD. Tht's not bad!

Bogdan

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is 1200 bps enough for your needs. then u can probably implement a v.23 modem and use the ax.25 protocol(packet radio protocol) for data transmission. the modem along with the protocol in any decent microcontroller.
write to me(email id: arvind_govindaraj@yahoo.com) if u need further information.

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Check out this company:

http://www.linxtechnologies.com

I have used their products before and they are quite nice.

Good luck!

Monsoon

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linx is a very good rf company. i like their product....
when u say short range, how short, is short?

-nick

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check out the rf-24g on www.sparkfun.com -- just came across it a few days ago; looks really nice, although i haven't picked one up yet...

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I only need to control a couple of switches from a remote distance of 10-20m so it is realy short and very low speed. I looked at the Nordic VLSI solution and it looked good, only need to find a distributer that can ship to Sweden.
Thanks for your help

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ingemar_76 wrote:
... I looked at the Nordic VLSI solution and it looked good, only need to find a distributer that can ship to Sweden...

Eurodis Electronics AB
Phone: +46 850 554 500
Fax: + 6 85 055 450
sales.sweden@eurodis.se

Hava a look at my web page -> http://www.tobiscorner.at.tf

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tymm - those 2.4GHz transceivers look very interesting. Spec says they output 1mW and they have a teeny etched circuit antenna. With properly oriented antennas, I wonder what the line of sight range is? They are much more narroband that 802.11, and at 1mW versus 100mW as in WiFi, I'd speculate that the range would be 100-200 ft. line of sight.

Also they have 3V not TTL interface.

anyone used these?

Google says this might be the manufacurer
http://www.wenshing.com.tw/Engli...

and this is a distributor
http://www.sparkfun.com/shop/ind...

scroll to the 2.4GHz product

Last Edited: Sun. Jun 6, 2004 - 03:47 AM
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ingemar - You might want to give this a try - I did. Works good.
Buy some of the really inexpensive radio controlled micro sized cars. US$4 or so, for car + transmitter. Remove the receiver from the car. Remove the transmitter PCB if you want.

The receiver PCB has 4 switched outputs connected to two motors. Remove the motors. As the transmitter has 4 buttons, the four outputs switch +V and ground to control the direction of the two motors. I used the outputs with a load tied back to +12V (an LED). The receiver runs on 1.5V.

They come in versions for several different radio bands. I tried the 27MHz units, with longer antennas than stock, and got 75 ft including a few walls.

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stevech,

Have you tried sending a serial stream of data with this setup? Would be curious as to what baudrate you could achieve.

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I don't have the product - just looking into it

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Does wireless always mean "radio". What about IR transmitter/detector pair.. pointed at each other? OK if line-of-sight is not an issue with your application. Cheap cheap solution takes one pin on MCU at each end.

Regards,
Scott

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Check out stuff at this site: http://www.chipcon.com

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IR is ideal for line of sight short range. Simple.

the transmitter for r/c cars wouldn't do more than about 5 or 10 bits per second. It's really just for on/off remote control

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If you use Infrared, use a clock signal instead of just "on" state. This way, you will not be influenced by ambiant light. The signal would then be "transmit clock" for a "1" and no signal for a "0".

hachey
... to boldly go where no AVR has gone before...

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IR can be good for some applicaions but not for mine. I am a hangglider pilot and when I am up in the air I want to be able to controll some devices, like camera and radio, with a small cordless panel mounted on my speedbar. I like the "hacking" approach withe the r/c car.