Trying to read 1-Wire sensors...

[synaps-o-dan]

Hi all,

I am looking for help for my latest project. I would like to do data logging from a few 1-Wire sensors with my ReadyNAS Duo. The sensors are connected via a http://www.ibuttonlink.com/linkusb.aspx into one of the rear USB ports of the DUO. The sensors and the LinkUSB interface both work under windows. However, I'd like to use the Duo (which runs daily) to perform data logging. I am not a Linux expert, but eager to learn and would be really grateful for any help.

I have installed digitemp on the duo with

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apt-get install digitemp

The Duo should have drivers for the LinkUSB on board. If I try

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lsusb

I get

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Bus 003 Device 001: ID 0000:0000 
Bus 002 Device 002: ID 0403:6001 Future Technology Devices International, Ltd 8-bit FIFO
Bus 002 Device 001: ID 0000:0000 
Bus 001 Device 001: ID 0000:0000 


So I guess there are drivers for the LinkUSB (which is a serial USB interface) installed and working as Device 002.

However, if I try

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digitemp_DS9097U -w -s /dev/ttyUSB0

I get the following error message:

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DigiTemp v3.3.2 Copyright 1996-2004 by Brian C. Lane
GNU Public License v2.0 - http://www.brianlane.com
Error 8: Open COM Failed
Error 23: Failed to acquire a necessary system resource


Can anybody help me?
Thanks in advance!
Daniel

[synaps-o-dan]

Okay, after a few more trials I got the sensor network working. Basically, what I had to do was to install two modules for a serial/USB interface, usbserial.ko and ftdi_sio.ko (in this order). The two packages were kindly provided in another thread. I have used modconf (can be installed with apt-get modconf) to permanently add them to the kernel. For reading out the sensor values, I use digitemp (installed via apt-get digitemp). If digitemp is called by a crontab job and its readings are dumped into a text file, a basic but powerful data logger can be achieved.
The sensor hardware is pretty inexpensive, and the data logger can easily implemented on a ReadyNAS, so this seems to be a really neat way to set up a sensor network for all kind of measurements. Even with my limited Linux skills ....
Cheers,
Daniel