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.
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.
Thanks for giving an old man some help.
Peter
On Tue, Mar 1, 2016 at 12:45 PM, Johan Ström <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>
> 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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