Two Wire interfaces

I've been making some of my own electronics, I've got an arduino and an atmega8 and L293D hooked up.

I have found some good resources for avr code on the net (http://hubbard.engr.scu.edu/embedded/)

My question is, has anyone done any coding on a two wire interface for the reprap electronics?

I like the two wire interface because I can (eventually ) get multiple avr to talk with 4 wires (5V,Gnd,data,clock).

I am also halfway through getting a 644p (sanguino) onto a stripboard (I will post designs once it has been tested)


Simon

It's built into my Oshonsoft Basic IDE development system compiler, but I've not used it for anything

Hey Forrest,

The arduino interface has got a tow wire library as well (Wire) , I have tested it with my set up and it works. However this is just a byte based interface and does not specify any kind of command system.

I suppose my real question is has anyone worked on a control protocol via the two wire interface?

I see that Zach (all hail his sanguinosity) is looking into RS485, I will just continue my musings and keep hacking away at a two wire stuff.

My first real step to making this work is hacking up the boot loader to be two wire , so I can upload to any device on the Two Wire bus.

just-keep-coding ; just-keep-coding.....

I'm staying with USB and I2C for the nonce. I may switch USB to Ethernet eventually, but not so soon now that I've found that USB 2.0 shielded cables don't get disrupted with EMI/RFI.

I have been working on an LCD control button interface board.

Using the I2C bus and a Microchip mcp23017 chip I also have made it so it can use
the mcp23s17 so it will work on serial. It can also be addressable and could be used for a just keyboard interface.

Now the software has to be written to include the LCD. I have found just a
small test program for the arduino I2C LCD interface.

I hope to have info posted in the Blog in the next week or so.

Bruce