On Thursday 09 November 2006 17:09, Julien TOUCHE wrote: > Antti Harri wrote on 09/11/2006 14:37: > > My friend has the diagram and the part listing although some texts > > are in Finnish but I can translate them into English if you want. The > > parts are pretty cheap, less than 10 euros in here for one sensor, > > the DS1820 is the most expensive part. > > there is some doc here (french ...) > http://z-graphix.com/linux/temperature/howto.html > > what bugs me, is > 1- how do you manage multiple sensors without using one rs232 per sensor > or a way to connect with something else (like rj45/lan or usb; i want to > use an old > box which has 2 rs232 both used and 4-ports serial card seems not really > cheap)
You don't have to. You only need one rs232 and there you can connect as many sensors as you want. Have a look at how the 1-wire protocol works. > above link has some part for usb but seems there is not all details. > 2- how to manage sensor on distance > 10-20m: radio, wifi, ... Umm, I think there are 1-wire products that use wireless technology, but you should do ok using wires (up to 100m without using external power suply). Have a look at the pictures here: http://temp.roncero.org/informacion.php -- Jeszs Roncero <[EMAIL PROTECTED]> System Developer Tel: +44 (0) 845 666 7778 http://www.mxtelecom.com
