charlielito / node-red-contrib-sensor-ds18b20 Goto Github PK

Pretty new to NodeRed.
Using RPi Stretch/NR 0.18.7

Checked with
$ cat /sys/bus/w1/devices/w1_bus_master1/w1_master_slaves
28-051693ea56ff

$ cat /sys/bus/w1/devices/28-051693ea56ff/w1_slave
76 01 4b 46 7f ff 0c 10 d3 : crc=d3 YES
76 01 4b 46 7f ff 0c 10 d3 t=23375

any idea ?

Node https://flows.nodered.org/node/node-red-contrib-ds18b20-sensor works.

Can you add an offset field?

I have 3x ds18b20 on the same water system. So if no heating is working, all should read the same value.
But that is not the case. So instead off adding an extra function to add an offset, can you implement this in the library?

Thank you

I testet you code with two different sensores: DS18B20 (what it is designed for) and DS1820.
Found different values:
DS18B20 leads to values around 25.5 whats correct.
DS1820 leads to values around 3.18 what seems to small for roomtemperature.

Next i had a look at the code where you get the data from sensors :

my "w1_slave" files look like this:

• for DS18B20

94 01 4b 46 7f ff 0c 10 26 : crc=26 YES
94 01 4b 46 7f ff 0c 10 26 t=25250

• for DS1820

33 00 4b 46 ff ff 07 10 0b : crc=0b YES
33 00 4b 46 ff ff 07 10 0b t=25312

I am not really uset do java but it looks like you are calculating the value and you dont use the "t=" to find the value.

Could you maybe have a look on this?

Topic is missing in produced message. Even if Name/Topic is filled.

Hi

This node has stopped reading negative temperatures - I've tried 3 different sensors and 2 different pi (a Pi 4 2gb and Pi 4 4gb). The same sensors display negative numbers on my sonoff with tasmota so I don't believe there is anything wrong with the sensors.
What is really strange is that the node was able to report negative temperatures several weeks ago. I've run various updates on the pi's since that time but that shouldn't have broken this. Any ideas - (I can obviously fix it with a function block!)

If you need any other info - let as know.

Thanks in advance

Data:

Probes placed outside monitoring the temperature dropping)

Sonoff | Pi
0.7 | 0.7
0.6 | 0.6
0.5 | 0.5
0.4 | 0.4
0.3 | 0.3
0.2 | 0.2
0.1 | 0.1
0 | 0
-0.1 | 4095.9
-0.2 | 4095.8
-0.3 | 4095.7
-0.4 | 4095.6

Node red v1.2.9 running in docker (IOTstack build)

Pi 4 2gb & 4gb
Versions:
PRETTY_NAME="Raspbian GNU/Linux 10 (buster)"
NAME="Raspbian GNU/Linux"
VERSION_ID="10"
VERSION="10 (buster)"
VERSION_CODENAME=buster

PR #4 added a very nice bug fix and that code doesn't seem to be published to npm.