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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