2xDS18b20 GPIO Raspberry PI Topic is solved

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Ljasteran
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2xDS18b20 GPIO Raspberry PI

Post by Ljasteran » Monday 05 November 2018 12:27

Hello!
I conected 2xDS18b20 to 4GPIO Raspberry PI.
pi@raspberrypi:~ $ ls /sys/bus/w1/devices/
28-119995116461 28-3b7882116461 w1_bus_master1
devices
dev.png
dev.png (38.06 KiB) Viewed 247 times
Help plz. What is wrong? Why is only one DS18b20? And Where is 2nd?
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hrdwr.png
hrdwr.png (50.44 KiB) Viewed 248 times

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emme
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Re: 2xDS18b20 GPIO Raspberry PI

Post by emme » Monday 05 November 2018 12:35

directory list 1 device, it is correct Domoticz reflect the directory content

check wirings

Image
The most dangerous phrase in any language is:
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Ljasteran
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Re: 2xDS18b20 GPIO Raspberry PI

Post by Ljasteran » Monday 05 November 2018 12:42

pi@raspberrypi:~ $ cat /sys/bus/w1/devices/28-*/w1_slave
5d 01 ff ff 7f ff ff ff 97 : crc=97 YES
5d 01 ff ff 7f ff ff ff 97 t=21812
5c 01 ff ff 7f ff ff ff d4 : crc=d4 YES
5c 01 ff ff 7f ff ff ff d4 t=21750
The wirings are ok.

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emme
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Re: 2xDS18b20 GPIO Raspberry PI

Post by emme » Monday 05 November 2018 12:51

if it does not look for the second device there are few reasons:
1) wirings
2) cable lenght
3) I had more luky once using 5v instead of 3.3v
4) probe damaged
5) module issue (see https://www.raspberrypi.org/forums/view ... p?t=106041 )

make your choice ;)
The most dangerous phrase in any language is:
"We always done this way"

Ljasteran
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Re: 2xDS18b20 GPIO Raspberry PI

Post by Ljasteran » Monday 05 November 2018 13:03

1 - ds18b20 work (you can see logs on the top of this page)
2 - lenght - 10cm
3 - i try 5. The same result.
4 - See point 1
5 - see point 1

Ljasteran
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Re: 2xDS18b20 GPIO Raspberry PI

Post by Ljasteran » Monday 05 November 2018 13:05

Can it be a bug?

rv24531
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Re: 2xDS18b20 GPIO Raspberry PI

Post by rv24531 » Monday 05 November 2018 13:21

Try ...
- adjusting your poll timing to a bit longer
- 5v WONT work on the pi, it will at least reboot it. the GPIO's max at 3.3v and more coming in is harmful.

I had several other tips that have worked for me in the past I was going to post, but noticed your cable length is only 4 inches, you certainly shouldn't have any cable length issues there.

Check your private messages, I'm sending you a message.

Richard

pmmisiek
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Re: 2xDS18b20 GPIO Raspberry PI

Post by pmmisiek » Monday 05 November 2018 13:22

Hi,

You can read sensors behind of domoticz so physical connection is OK.

I'm not sure but it looks like domoticz uses 2 last digit of serial number as device ID.
You have 28-119995116461 and 28-3b7882116461 so domoticz shows it as one device.

Please try to use another one ds18b20 - probably it will have different SN :)

BR

Ljasteran
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Re: 2xDS18b20 GPIO Raspberry PI

Post by Ljasteran » Monday 05 November 2018 19:05

pmmisiek, you're right.
I tried another ds18b20. and it is fine.
Thx. I think it is bug, i will write it at "Bugs and Problems".

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