On 07/15/2012 03:13 PM, Doug Lytle wrote:
I've just started to play with a 1 wire temperature sensor, under Mageia
1. I've been following a couple of blog on how to get things setup (1 & 2).
I've installed the digitemp software (2) via urpmi and can actually see
the USB dongle (DS9490R) and my temp sensor (DS18B20).
The problem being that when running the command digitemp_DS2490 -a -i
-q, it is supposed to write out it's configure file (.digitemprc) to the
profile directory, which for me running the command as root, should be
/root/.digitemprc, but it doesn't.
Has anybody played around with temperature sensors under Mageia? If so,
were you able to get it to write out the file?
Doug
(1)
http://bitsup.blogspot.com/2008/11/one-wire-home-temperature-network-with.html
(2) http://www.nslu2-linux.org/wiki/HowTo/AddUSBOneWireAdapter
(3) http://digitemp.com
I have DS18B20 sensors running, but not on Mageia - my sensors are
connected to an AVR microprocessors (which is controlled by a C
programme, downloaded from my Mageia PC).
I have doubts whether it is possible to reliably operate 1-wire devices
directly connected to a PC that is simultaneously used to do "ordinary
stuff": the 1-wire protocol has quite strict bit-timing requirements
(the pin on the I/O port on your PC which drives the 1-wire bus must
create pulses with well-defined lengths and intervals), not evident to
implement on a time-shared PC - could also have negative impact on non
real-time applications that run on the PC. You might need to more or
less dedicate your PC to run your 1-wire application.
In case you cannot make it work directly on Mageia, the microprocessor
approach is certainly a valid (even better?) alternative since the
microprocessor can print the result to a serial port and hence to a PC.
In case this approach is of interest to you, we should discuss this by
PM (no problem to let you have my hard- and software)
Juergen
