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1 wire bus

Former Member

Hi Peeps,

 

I am about to embark on a 1 wire bus project using devices such as the Maxim DS18S20DS18S20+ temperature sensor and other similar devices. The idea of the 1 wire bus seems groovy enough but I wondered if anyone out there had any experience of this stuff.

 

The concept of the project is in 2 major parts, the physical hardware implementation of devices connected ono the 1 wire bus along with a USB transciever to connect it into the main motherboard. The second part is the software which will be Linux based and the idea is to use the Linux DBUS mechanism to create a self describing (a method called introspection) platform for applications which are interested to get hold of sensor data. There is actually a 3rd parrt to this project which is the applications themselves, but before I go blabbing on in detail about the project I thought I ought to see if anyone has any comments to make first.

 

Fire away

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  • I used Dallas one wire about 8 years ago and my memories of it are not pleasant! On a well laid out PCB the system works fine but if you intend running it over a cable network it can be less than impressive. It is susceptable to electrical noise causing devices to seem to disapear and then reapear for no imediatly obvious reason. After tearing my hair out for several months I left that company and swore never to use One-wire again. A few months later a tech freind of mine told a very similar war story and agrees that other than on a PCB it is a complete liability. In conclusion, if you want to run over a wired network DON'T TOUCH IT! Look at something boring like RS485

  • in reply to Former Member

    I think things must have improved since you had your mits on the 1 wire stuff. I've just banged together a prototype and strung 4 X DS18S20DS18S20+ digital thermometers on a 100M cable drum and they all report in no problem. Just for fun I shoved a GPRS modem into the middle of the coil while it was jabbering away to a mobile network and the 1 wire bus just kept on rollin in the data. I got some other 1 wire jobbies other than the thermometers to stick on it. I'll report back on how I get on with them once I get the USB drivers under control.

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  • in reply to Former Member

    I think things must have improved since you had your mits on the 1 wire stuff. I've just banged together a prototype and strung 4 X DS18S20DS18S20+ digital thermometers on a 100M cable drum and they all report in no problem. Just for fun I shoved a GPRS modem into the middle of the coil while it was jabbering away to a mobile network and the 1 wire bus just kept on rollin in the data. I got some other 1 wire jobbies other than the thermometers to stick on it. I'll report back on how I get on with them once I get the USB drivers under control.

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