One Wire Communication.

J

jjd

New Member

• Jun 8, 2011

• #1

What's the easiest way to communicate through one wire (and ground)?

I need to send two bytes between boards.
I only have one wire to do it. Is it possible to put a transistor between the RX and TX to cut RX off when TX is sending?

 

Ian Rogers

User Extraordinaire

Forum Supporter

Most Helpful Member

• Jun 8, 2011

• #2

You could do it as a master slave. When the master sends a command via hardware, then receive back via a software (bit bang)

The picture is an I2C converter circuit, should work.

 

Attachments

• I2C interface.GIF

  2.6 KB · Views: 214

Last edited: Jun 8, 2011

J

jjd

New Member

• Jun 8, 2011

• #3

In your diagram, what's to stop the TX signal from going into RX during transmission?

 

Ian Rogers

User Extraordinaire

Forum Supporter

Most Helpful Member

• Jun 8, 2011

• #4

Nothing! you can just read the Rx buffer as a dummy and lob it. ( no different to the loopback test ) If you do it with software it wont matter either.

 

J

jjd

New Member

• Jun 8, 2011

• #5

Thanks...

 

P

Pommie

Well-Known Member

Most Helpful Member

• Jun 8, 2011

• #6

There is also the Dallas One Wire protocol.

Mike.