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Author Topic: Transmit a signal over a wire far away.  (Read 1007 times)
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I need to transmit a signal from an arduino board to a LED strip that is 100m away at a speed of Mbps. How can I do that?
The LED strip would be similar to this one: http://www.pololu.com/product/2541
Thanks in advance.
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RS485 or ethernet ?
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And how can I use ethernet or RS485 if my arduino does not have any port for them?
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RS-485 only needs a serial port and a transceiver, you have the serial port and can buy a transceiver shield.

Ethernet only needs an SPI port and a WS5100 (or similar) interface chip, you have the SPI port and can buy an Ethernet shield with the interface chip.

Personally I would go for RS-485, I think it will be easier to set up as it's just simple async serial comms.

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Personally I would go for RS-485, I think it will be easier to set up as it's just simple async serial comms.

Absolutely.  Ethernet would be overkill here.

And how can I use ethernet or RS485 if my arduino does not have any port for them?

Usually I'm the last to throw out the "google it" response, but really... :-)  You're going to have to put some effort into this...  Searching for "arduino rs485" yielded a post on this forum as link #1, and SparkFun's shield as link #2.
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Open air wireless is an option too...  there's some transmitters around - nrf come to mind.
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Thanks for the replies.
I need to stress in he fact that I must use only one arduino board and that I need to change from low to high in 0.7 us, do you really think that the speed of the rs-485 is enough to transmit to that speed when the other end is at 100m?
I have read that "a 50 meter cable should not signal faster than 2 Mbit/s". It is true that I could use another arduino board to receive the signal and to control the led strip but that would increase the cost.
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The Pololu LED strip uses signals with 2.5 microsecond bit time, which is 400 kilobits/sec
You could always just try with 100 m of cable and see if it works.
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RS485:
The RS-485/RS-422 standard covers line lengths up to
4000 feet.
http://www.maximintegrated.com/datasheet/index.mvp/id/1111

The driver slew rates of the MAX481, MAX485, MAX490, MAX491, and MAX1487 are not limited, allowing them to transmit up to 2.5Mbps.

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Designing & building electrical circuits for over 25 years. Check out the ATMega1284P based Bobuino and other '328P & '1284P creations & offerings at  www.crossroadsfencing.com/BobuinoRev17.
Arduino for Teens available at Amazon.com.

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Pololu looks like it is using this chip
Uses different length highs & lows to make 0s and 1s, then low for a certain time period is used to indicate "no more data, update the output".
Passing that along via RS484 transmitter to RS485 recevier would work fine.

* WS2811-preliminary-EN[1].pdf (319.93 KB - downloaded 3 times.)
« Last Edit: December 06, 2013, 01:45:57 pm by CrossRoads » Logged

Designing & building electrical circuits for over 25 years. Check out the ATMega1284P based Bobuino and other '328P & '1284P creations & offerings at  www.crossroadsfencing.com/BobuinoRev17.
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Hi,

I'm offering some of my expertly manufactured wireless cables on ebay.
They work perfectly well without any Arduino shield.

The wireless cables consists for the most part of nitrogen (78%).
The other 22% are separated in pure oxygen and noble gases.
It's award winning low amount of carbon dioxide (only 0.03612%) is also worth mentioning and
offers very high transfer rate (tested up to 1.0 GHz).

The cable could be used for almost all data connections up to a maximum length of 100m (328ft).
Due to it's great flexibility it could be installed in only a few seconds.

I use the cables a lot to connect temperatur sensors around my house.

-(CBR)
PS: With the new enhanced version you could transmit power, too. (up to 15W max.)


« Last Edit: December 06, 2013, 02:43:13 pm by CaptBlaubaer » Logged

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How do you transmit 15W wirelessly? You beaming microwave energy around the house or something?
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Designing & building electrical circuits for over 25 years. Check out the ATMega1284P based Bobuino and other '328P & '1284P creations & offerings at  www.crossroadsfencing.com/BobuinoRev17.
Arduino for Teens available at Amazon.com.

Lacey, Washington, USA
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Snork. I have a petition to ban the dangerous chemical Dihydrogen Monoxide for you to sign, once you are done ordering some of CaptBlaubaer's wireless cable.
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@CrossRoads: I can't disclose detailed information about the technology the wireless power cable uses at the moment, because the patent is still pending.
Just a hint, it is one of the first commercial products using the Brout-Englert-Higgs mechanism transmitting bosons in a well defined Higgs field.
« Last Edit: December 06, 2013, 03:54:08 pm by CaptBlaubaer » Logged

Lacey, Washington, USA
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I am intrigued by your ideas and would like to subscribe to your newsletter.
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