AVR-Chat

They can have separate supplies if you need this capability. You just need
to connect the GND of each to get a common voltage point. Use the same
voltage of supply at each board and use good decoupling at the power entry
points of the board and close to the processor power pins.

 

How long is the final intended connection of each board? I2C is Inter IC
Communications bus and really intended for all being on the same PCB or
within the same chassis. It is not designed for long cables.

 

If you need longer link, you can consider implementing RS485?

 

From: AVR-Chat@yahoogroups.com [mailto:AVR-Chat@yahoogroups.com] On Behalf
Of jstockma
Sent: 22 October 2011 07:31
To: AVR-Chat@yahoogroups.com
Subject: [AVR-Chat] Basic question about breadboards

 

  

I am a AVR hobbyist and I am currently working on a project to design and
program a two wire interface between to Mega AVRs in which one would send
instructions to the second directing certain tasks. I have the software side
of it well underway but I am having doubts about the hardware part of it. I
have determined that I must power each chip from the same power source (in
this case a voltage regulator) and that I must connect the two wire busses
to a common ground. What I am concerned with is my basic choice to implement
this on a breadboard. The busses would be the side rails. I am seeing
conflicting opinions about breadboards and their suitability. I would be
interested in more views on this from the group. Ultimately I can go with a
soldered solution, but I would like to do the prototypes on a breadboard if
possible, at least until I get it up and running. I have no EE or EE
Computer science training. Thanks, 





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