On 01/03/16 22:21, Peter Hollenbeck wrote:
Question regarding the workings of this forum:
Does everyone see your email and does everyone see this reply?
I hope so, so that all information on the subject shared.
Correct, every mail sent to this address is sent to every member of the
list, and is archived at
https://sourceforge.net/p/owfs/mailman/owfs-developers/
Anyway, I followed the suggestion of one person to connect a 1K
resistor to 3.3 V and Data. The DS18B20 is not seen but the MS-TV is.
I then removed the resistor and the MS-TV disappeared. By this I mean
that in the OWFS 1wire directory the entry 26.AA5245010000 went away.
I do not understand this stuff well. But I do have working, on another
Raspberry Pi, OWFS 1wire humidity, solar, and temperature.
Let's back it up. How is everything connected? You have the Raspberry
Pi, and you mentioned the LinkUSB. And your 1-wire devices. Where are
cables from the 1w devices go? Directly to the Pi, or to the LinkUSB
which is connected via USB to the Pi?
Thanks for giving an old man some help.
Peter
On Tue, Mar 1, 2016 at 12:45 PM, Johan Ström <jo...@stromnet.se
<mailto:jo...@stromnet.se>> wrote:
In your initial post you wrote "I have a Raspberry Pi with LinkUSB
and a MS-TV reading DC voltage."
If you have a LinkUSB, you don't connect your 1-Wire devices to a
GPIO pin, right? The LinkUSB should not require any pullup at all.
On 01/03/16 21:16, Peter Hollenbeck wrote:
It did not work without the resistor.
I thought to look at Adafruit product information:
https://www.adafruit.com/products/381
"We toss in a 4.7k resistor, which is required as a pullup from
the DATA to VCC line when using the sensor."
Yesterday evening it worked with the 5K resistor. (Actually 5 1K
in series.)
This morning I tried with 4K. It didn't work.
With or without the resistor, soon as I connect the DS18B20 the
MS-TV device disappears and the DS18B20 is not seen.
I don't know electronics but does this sound like too much
resistance is being introduced by the long cable?
Thanks for your reply.
Peter
On Tue, Mar 1, 2016 at 11:22 AM, Matthias Urlichs
<matth...@urlichs.de <mailto:matth...@urlichs.de>> wrote:
On 01.03.2016 19:48, Peter Hollenbeck wrote:
> When trying to get it working I read that the DS18B20 needs
a 4.7K
> resistor connecting +5V to Data.
Where did you read that? Did you try without the resistor?
-- Matthias Urlichs
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