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hailumei
02-21-2012, 02:01 PM
Hi,

I need to watch nine machines, each machine have three inputs, and only have a six conducter cable with them. If I use the Propeller and I2C for this project, then I only need two wires. So what I need is a I2C chip on each machine with a Propeller and set up one for master to do the controlling. I wonder if I use the XBee would make the job easier? Any input is appreciated.

Thanks,

Hai

Duane Degn
02-21-2012, 10:20 PM
Do you mean each machine has three outputs? If so, what is the output?

What's the distance between machines? What's the distance to were you want your logging circuit?

I'm not so sure if I2C is the way to go. I thought I2C (at least 3.3V I2C) was for short distances (about a meter). I'd think RS-485, RS-232 or wireless would all be possible choices depending on the specifics.

You might want to take a look at the Nordic transceivers. There's a link to $3 modules in post #1 of my index (see signature). Post #2 lists some projects that include wireless communication.

hailumei
02-22-2012, 04:46 PM
Thanks for the reply Duane.
Yes, there are three push button switches on each machine. The distance between them is about 25 feet and the main controller would be about 50 feet away from the machines.
I may go for the wireless if the I2C only works for a short distance. I wonder how good the Xbee to handle the noise of the industrial enviroment. I will order a pair and try out.
Thanks.

Hai

Duane Degn
02-22-2012, 05:08 PM
Before ordering XBees make sure you figure out if you want Series 1 or Series 2 (aka ZigBee). The Series 1 units are easier to use out of the box but the ZigBee units make it easier to use more than two XBees in a network.

hailumei
02-24-2012, 04:19 PM
Thanks Duane. It is appreciated. You have a nice weekend!

Hai