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I am interested in RS485 as well, would like to wire up an Arduino compatible LAN around the house.  Doesn`t anybody make an affordable shield using one of those chips?

RS-485 is NOT the same as ehternet, so be careful.  They both utilize the RJ-45 connector type but are entirely different protocols.  If you want to put an arduino on your LAN, you should get the arduino ethernet shield.

I'm looking for cheap.  I don't need ethernet to monitor my sump pump.

You'd need to make your own shield with that chip then.

Hi, Here's an RS485 "Electronic Brick" which usesa 4 pin connector for +5, Gnd, Xmit, Rcve  and another pin for Bus Direction. It has two 3-pin connectors for bus in and bus out, with + and - data and Gnd.  http://arduino-direct.com/sunshop/index.php?l=product_detail&p=63

There is some incomplete information here: http://arduino-info.wikispaces.com/RS485-Brick  (which I have not finished translating, so the later part is still quite Chinglish..). Hope to finish this up soon... and add photos.. I'll try to find an image now... (see below for 3 Arduinos networked)..

This will be a continuing Arduino product in my shop, and the developer is considering a version with different RS485 bus connectors.. If anyone has suggestions on this, please let me know..

RS485 with a decent protocol would be a good low-overhead low-cost (These are $6.50 per node) solution.

I plan to show a Home Automation application using these...

Regards, Terry King

...In The Woods In Vermont

terry@yourduino.com

Hi Jeremy,

I have a question about using an arduino as an avrisp programmer. I am trying to a program an Atmega328P-AU (TQFP32 package) with the arduino bootloader, using my arduino duemilanove as an avrisp, and avrdude. But, everytime I try to read in the chip throught windows command prompt and avrdude, I get an error saying the device signature is incorrect. I have been able to read in a regular Atmega328p chip (PDIP28 package) just fine in the past. Does the TQFP chip have a different device signature? If so, how would I program it with the bootloader?

thanks,

Carlos

Hi,

maybe someone has to sell USBTinyISP ?Sent message to my private.

thanks

BR/Ugnius

Terry King:

These RS485 look interesting but appear to use a proprietary cable connected to a proprietary shield? I would be interested in the brick without *any* soldered on connectors. Could then use as part of a hard wired home monitoring node. Could not find a spec sheet on the brick or the chip it uses on the web site.

This raises the question of, at what point is it worth doing your own printed circuit as opposed to buying a breakout board. I would buy ONE, think about buying FIVE, but do a printed circuit for TEN.

I had inquired regarding connecting this Devantech SRF02 to an Arduino

http://www.acroname.com/robotics/parts/R287-SRF02.html

and you indicated that an option would be to start by soldering on header connectors. In a separate kit I bought I have some of these.

http://www.o-digital.com/uploads/2179/2187-1/Pin_Header_Connector_Straight_Type_801.jpg

So, I would break off five of those and put the short sides through the holes (they fit through fine) and then put solder in the hole? That sounds like a good idea. Seems the pins are 1/10 inch apart, but I'm not sure how to find a connector that would fit on, matching those five pins... How might I best find the appropriate sized wired connector? Thanks.

hi,

how write  code?,(arduino uno, ATMEGA328P-PUATMEGA328P-PU) I need if analog input <2V then 2,3 pins output high, if input>2V then 4,5 output pins high, if >....., then ....

Thanks for advance

Bye

BR/Ugnius