DS18B20 dropping from domiticz

[njlammerts]

I have overcome the problem of DS18B20 and recognition by last address decimal. I ordered several DS18B20's by different sellers, so I have now 6 sensors that are recognized as separate sensors. Now I have the problem that sensors are dropping out of raspberry. With the command:

cat /sys/bus/w1/devices/w1_bus_master1/w1_master_slave_count

Schermafbeelding 2023-01-28 om 12.47.04.png (34.95 KiB) Viewed 1721 times

I get the reply how much sensors are detected. After 2-48 hours of hard reset (power off) the reply is always less then 6. Sometimes it is 6 but after some time the sensors are dropping and are not recognized anymore. This means that the directory's are not present.

Schermafbeelding 2023-01-28 om 12.37.34.png (33.49 KiB) Viewed 1721 times

In below graph it shows that sensor stops working on Friday at 20:10 and spikes up after restart raspberry on Saturday at 12:xx

Schermafbeelding 2023-01-28 om 12.55.37.png (379.07 KiB) Viewed 1721 times

Only CV retour and Boiler Middle kept working over this period

I have read something about counterfeit/fake sensors, but also about a piece of 1wire software that is not working correct in the newest version. Does anyone recognizes this and has found a solution?

[willemd]

I am using 2 sensors without problems.

How is your wiring? Could this be a reason for them dropping out?

[BartSr]

I m using lots of DS18B20 sensors. All from Ali.
These are hooked up to ESP8266 with EspEasy.
Never had a sensor dropped.

[njlammerts]

I m using lots of DS18B20 sensors. All from Ali.
These are hooked up to ESP8266 with EspEasy.
Never had a sensor dropped.

Can you connect multiple DS18B20 to one ESP8266, or does every DS18B20 needs its own ESP8266?

[njlammerts]

I am using 2 sensors without problems.

How is your wiring? Could this be a reason for them dropping out?

I have all DS18B20 connected to a piece of experiment print and from there i have about 40cm cable to the Pi. The pull-up resistor is also on the experiment board. All the wires from the experiment board are +- 1m long

pcb-experiment-print-single-sided-25x6cm-with-line.jpg (66.61 KiB) Viewed 1688 times

Strange thing is that the sensors stay working somtimes for 1-2 days and sometimes drop after 1 hour.
To get the sensors back, i have to turn power off/on the raspberry and sometimes 1 or to are missing also and an other power/off/on is needed.

[willemd]

I am not on expert on electronics, but with that kind of unpredictable behaviour I would expect a hardware issue rather than software, such as maybe power below/above a certain threshold switching the sensors off. I would experiment with different setups, starting with a different power supply. Then, are the sensors connected to the 5V pin or 3.3V pins?

[njlammerts]

I have a degree in Electronics an can say that power is not the problem.
The problem is with both 3.3 an 5V power from the GPIO 1 and 2 pin. I use the original power supply that came with the Raspberry.
Also the sensors seem to drop at random. The 2 that are working now, may not be working tomorrow.
So its not a power problem

[njlammerts]

When the Pi is booted there are 6 directory's for 6 sensors, each wit the name of the specific 1-wire ID.

Schermafbeelding 2023-02-03 om 18.04.17.png (20.35 KiB) Viewed 1644 times

In this directory are lots of other files and dir's.

Schermafbeelding 2023-02-03 om 17.57.58.png (23.34 KiB) Viewed 1644 times

When the sensors are dropped, the specific directory's are also gone, so that's why there is no temperature info.

[waltervl]

This is probably a RPi or cabling issue.
Check internet, I came across this topic: https://forums.raspberrypi.com/viewtopic.php?t=25154

[njlammerts]

I am running stable now for 6-9 months now. The problem is/are not original DS18B20 sensors. I bought some from Amazone.nl and AlieXpress and they are not to be trusted. I have a different source of sensors and that goes well!!
I now have about 6-7 running on 1 PiZero and works fine.