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AC_Hacker · 10-04-16, 11:54 PM

Mostly straight on the 1-Wire thing.

As you said, at minimum, you need Ground, and you need Data. It can be done, but the specifications are very strict, and if not adhered to, bad data will result.

It is SO MUCH EASIER to go with Ground, Data, Power. The layout is way more flexible, and tolerant of noise.

They say it MUST be done in a serial fashion, or if you have branches, badness will happen.

Rebel that I am, I did one branch (which would be fatal with 2-wire) and the data logging was very stable.

At 3 branches, I encountered a bit of trouble on start-up.

Each sensor has a unique number so the data logger can tell where data is coming from. If you don't know which sensor is giving you particular readings, you can run the system and warm up individual sensors, and watch the results.

I think that 1-Wire sensors are the greatest thing since Sex Lube.

-AC

P.S.: I am still very pleased with the Multilogger. It will work right away, as is. The source code is available on site. If you have the skills you can do other interesting things with it as well. There are better data loggers, but there is a substantial price jump.

10-04-16, 11:54 PM	#8
AC_Hacker Supreme EcoRenovator Join Date: Mar 2009 Location: Portland, OR Posts: 4,004 Thanks: 303 Thanked 723 Times in 534 Posts	Mostly straight on the 1-Wire thing. As you said, at minimum, you need Ground, and you need Data. It can be done, but the specifications are very strict, and if not adhered to, bad data will result. It is SO MUCH EASIER to go with Ground, Data, Power. The layout is way more flexible, and tolerant of noise. They say it MUST be done in a serial fashion, or if you have branches, badness will happen. Rebel that I am, I did one branch (which would be fatal with 2-wire) and the data logging was very stable. At 3 branches, I encountered a bit of trouble on start-up. Each sensor has a unique number so the data logger can tell where data is coming from. If you don't know which sensor is giving you particular readings, you can run the system and warm up individual sensors, and watch the results. I think that 1-Wire sensors are the greatest thing since Sex Lube. -AC P.S.: I am still very pleased with the Multilogger. It will work right away, as is. The source code is available on site. If you have the skills you can do other interesting things with it as well. There are better data loggers, but there is a substantial price jump. __________________ I'm not an HVAC technician. In fact, I'm barely even a hacker...