Another try... ds18b20 errors

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Sorry to bother you guys again…

I bought a brand new ds18b20 (in China)

This thing keeps giving me these errors:

Error reading DS18B20Sensor with hardwareId 28-0316544480ff: ENOENT: no such file or directory, open '/sys/bus/w1/devices/28-0316544480ff/w1_slave

The interval is on 60000 and the error occurs every minute

When I first installed it, it didn’t give that much errors but it looks like the number of errors grow by day. This is the third one with the same errors.

It is connected like this:
1: GND
2; DATA
3: 5V
with a resistor between 2 and 3

Any idea?

maybe this one helps

Edit /boot/config.txt
Add the line dtoverlay=w1-gpio
Reboot the Pi

Okay…here is what caused the trouble…

I connected the ds18b20 alone first, that went smooth and did not give any errors.

Then I connected a utp cable (3 wires) on the same pins and about 6 mtrs further, on the end of that utp cable I connected a second ds18b20. It seems that or the latter one is broke, or it is not possible to connect two ds18b20’s on the same pins by using only one resistor.

Removed the long sensor and no errors at all since then.

ok, nice to hear.
can we mark it as solved?

In my setup I have 2 sensors connected with one resistor. One directy “behind” the resistor and the other one is connected through 5 or 6 meters of CAT5 cable. No issues during the past 1,5 year…

In addition to that, my sensors also have a 1m cable.

@leader21 Yes I suppose you can. I’m going to test if the one on the longer end is broke by connecting it direct and see what happens

@vanturenhout
would say first try that and come back with some news, then i will close it if the sensor was broken.

@vanturenhout you can also connect them by two wires and only one resistor (parasite power mode). Have that running for more than one year without any troubles.

@leader21 The sensor on the longer wire also works. The way I connected it probably caused the problems. Trying the Parasite way now to have two sensors being read at the same time.