No I use no resistor. The problem may be that you have several long cables. I once tested how long a cable could be and ended up at approx. 32m. But for my UBS I have 4 sensors where the cables are 18, 4, 2 and 0.5 m.

DS18B20Arduino

in my wiring ‘star’, i have approx 2x15m and another 2x28m. That other wiring pattern you suggest (more like a ‘bus’ i guess) is possible. This way, i would end up with 1x15m (one sensor) + 1x28m (and this 28m one has 3 drops for the other three sensors), which would take about 50m off the total distance of cat6 cabling. Worth a shot you reckon?

1) yup no probs there. Ive been Removing and re-adding like crazy over the past two weeks trying diff things, so yup understand that.  2) hmm, just how diff in terms of length are we talking? They will be a little (50cm) diff likely.

DS18B20Temperature sensor

Serial / Parallel Gateway Module. With one parallel and one RS-232 serial port, the 5824. Serial/Parallel Interface allows you to connect virtually any.

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DS18B20ESPHome

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DS18B20resistor

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No need for a resistor. The 1-Wire network is designed to work as a bus, rather than a star. This means you should design your network so that the sensor devices are connected in one long line starting at the master and not so that there are several cables from the master heading out to sensors in all directions.The maximum network length depends on many factors so it is not easy to give a firm guide as to what will work and what will not. As a general rule is not recommend you build each bus on your network with more than a total of 100m of cable, but Fibaro says only 30m in total. However cable quality and routing play a big part in determining how well a network will work. Cat5e or Cat6 cable, and that you route it as far away as possible from mains cables and appliances (especially electrically noisy ones).

There are two things that are important for a good function. 1) All sensors must be connected before including the UBS to the Zwave network. If you connect additional sensors, you must remove UBS from the network and then include it again. 2) Sensor connection cables should be slightly different in length. If all the cables are the same length, it can become conflicts when transmitting data.

DS18B20 wiringRaspberry Pi

This tutorial uses a dual-color (Blue and Yellow) and 128×64 resolution OLED display. Also, this OLED display can be activated by giving us a 5v potential.

There are two things that are important for a good function. 1) All sensors must be connected before including the UBS to the Zwave network. If you connect additional sensors, you must remove UBS from the network and then include it again. 2) Sensor connection cables should be slightly different in length. If all the cables are the same length, it can become conflicts when transmitting data.

DS18B20Datasheet

Then, i installed on site. the wires was above the false ceiling, on the cable tray running together with 230Vwires around them. fail over 10m, probably elecrical interference... I had no chance to try with shielded wires. The connections was the same like yours.

In addition to my UBS with 4 sensors, I have another 1-wire network that is logged into a Raspberry (RRD database). Both my 1-wire networks are "bus" type and the total length of the Raspberry network is probably a bit over 40 m distributed on 4 sensors and one text display. Please tell us how you solved your 1-wire network.

No I use no resistor. The problem may be that you have several long cables. I once tested how long a cable could be and ended up at approx. 32m. But for my UBS I have 4 sensors where the cables are 18, 4, 2 and 0.5 m.

re max 30m - in my case with a star witing, i assume each leg / ‘spoke’ in my cable Star can be that long. Have heard people running upto 100m on cat5/6 choosing the wires like i did (1 core of the twisted pair that buffers against EM interference / crosstalk) but im not sure if that was a single run/bus.

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