Arduino with Ethernet ?

Hi

Is there a way to have Arduino with a Etthernet connector ??

I need to connect several arduino to one computer…and I don’( see how to to that with serial…if not having 10 serial ports…

Any idea ?

Thanks

Seb

You use USB ports to connect Arduino to the PC.
Then on the PC a VIRTUAL serial port is established for each Arduinio bord connected to the PC.
So you do not need a PHYSICAL serial port for each Arduino board, just a USB port.

I don’t know how many Arduinos you can connect via USB. I have only tried two at the same time.

You can connect the Arduino to a Ethernet device with something like Lady Ada’s Ethermet shield for Arduino : http://www.adafruit.com/index.php?main_page=product_info&cPath=17_21&products_id=83&zenid=17d891c69840ba3c0791af1a91a37f30

But the shield and the Xport module would cost more than 40$ for each Arduino board

There are other Ethernet to Serial modules available as well

Hi
I need to connect several arduino to one computer…and I don’( see how to to that with serial…if not having 10 serial ports…

Any idea ?

Off the top of my head (ie. I’ve not tried it), how about using Two-Wire Interface (TWI)…?

http://wiring.org.co/reference/libraries/Wire/index.html

Connect 1 arduino to the computer via USB and set it to be the TWI master.

Set the other 9 arduinos up to be TWI slaves and connect them to the master via SDA & SCL (12 and 13 on shield connector I think).

Very close, it’s A4 & A5 with common ground and vcc.

There’s a bit of chip to chip over i2c covered here:-

http://www.arduino.cc/cgi-bin/yabb2/YaBB.pl?num=1205243372

Very close, it’s A4 & A5 with common ground and vcc.

so that’s analogue 4 and analogue 5, thanks John. So when’s the 10-core board design due…? :wink:

I spent ages looking for this reference image last night, so I’ll include it here:

[ http://www.arduino.cc/en/Hacking/PinMapping168 ]

If you look at the common duino boards with the USB connector pointing towards you, then the top 2 shield connectors correspond roughly with the pins as shown.

I was also referring to the Diecimila Schematic, but that doesn’t include labels for SDA & SCL.

btw I suspect you may need an external power supply if connecting as many as 10 boards, since a USB port can only supply 500mA maximum.

10 core ;D

Two IC’s provides quite a bit of surplus capability for what we’re using them for so I don’t think we’ll go beyond that.

10 would definitely present an interesting power dilemma, we might sit that one out and wait the imminent arrival of an Arduino 128, and that would be something :slight_smile: