I want to connect multiple ds18b20 temperature sensor in a single bus. My question is not about how to wire those sensors to have they working or how to write the code... is about how to physically wire and solder those sensors in a single cable. I will not use long cables, ever less than 4 or 5 meters, including about 10 sensors each line, not regularly distributed along this distance. Probably i will use normal power for them (not parasitic mode).

I readed in different places in this forum that the people connecting multiple sensor to a single bus use cat5 or cat6 cable... so, following their experience, i will do it in that way. But, how to connect the sensor? I know, i know, removing the plastic to three wires and soldering the legs of the sensor. :P

How do you wire them? Do you use a special connector to the cable to derive three of the wires to solder there the sensor? Do you solder the sensor directly to the cable?

In my project, some of the buses will be outdoor, so, i have on mind to protect inside a plastic tube (of something like this), with hole where the sensors will go outside to be exposed to the environment, but all the other connections will be inside the cable. To use somekind of tiny connector between the main cable and the sensor could be a nice idea just in case to replace a possible defective sensor in the future. The devide will be in the middle of anywhere, so to solder in the field is not an option, and to replace all the bus is a very remote option (require to have a copy of the cable and all the sensor already ready). I think that to have the sensor with an short cable, ready to connect to the main cable is the perfect solution. So, in case of fault of one of the sensor, to unplug the broked one and the connection of the new one is enough, remaining the main cable and all the other devides in place.

Now that you have the big picture of what i hace of mind, do you have ideas, proposals or comments about how could i do that? They will be wellcome. Thanks so much! Small Bio

[quote=Martin post_id=219 time=1488375320 user_id=82] I want to connect multiple ds18b20 temperature sensor in a single bus. My question is not about how to wire those sensors to have they working or how to write the code... is about how to physically wire and solder those sensors in a single cable. I will not use long cables, ever less than 4 or 5 meters, including about 10 sensors each line, not regularly distributed along this distance. Probably i will use normal power for them (not parasitic mode).

I readed in different places in this forum that the people connecting multiple sensor to a single bus use cat5 or cat6 cable... so, following their experience, i will do it in that way. But, how to connect the sensor? I know, i know, removing the plastic to three wires and soldering the legs of the sensor. :P

How do you wire them? Do you use a special connector to the cable to derive three of the wires to solder there the sensor? Do you solder the sensor directly to the cable?

In my project, some of the buses will be outdoor, so, i have on mind to protect inside a plastic tube (of something like this), with hole where the sensors will go outside to be exposed to the environment, but all the other connections will be inside the cable. To use somekind of tiny connector between the main cable and the sensor could be a nice idea just in case to replace a possible defective sensor in the future. The devide will be in the middle of anywhere, so to solder in the field is not an option, and to replace all the bus is a very remote option (require to have a copy of the cable and all the sensor already ready). I think that to have the sensor with an short cable, ready to connect to the main cable is the perfect solution. So, in case of fault of one of the sensor, to unplug the broked one and the connection of the new one is enough, remaining the main cable and all the other devides in place.

Now that you have the big picture of what i hace of mind, do you have ideas, proposals or comments about how could i do that? They will be wellcome. Thanks so much! [/quote] I think you have answered your own question. The distances you envisage are not great, I don't think there are any specific wiring requirements in the data sheet, and you can do more or less what you like.

I think the reason why people use CAT5 is because it is cheap for the quality, and an obvious choice, particularly if you have a terminal tool. All my sensors are waterproof and come with 5m cable. I had trouble with an extension and I believe this was because I used cheap thin cable. I thought the cable needs to be shielded. This is not true.

In my case, the bus, such as it is, is on the shield and all the sensors are brought back to that. You could use the same waterproof sensors and cut up the cables to make a daisy chain of short branches terminating in 2.5mm stereo sockets, with the sensors terminating in matching plugs. The branches and the connectors are then all easily protected with heat shrink tubing. The sensors are cheap on eBay with varying lengths of cable, and can be bought sans plug.

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