Unfortunately, I don't read German so I couldn't read the description of your project.
The 1-wire bus will support much more than 10 devices. I'm not sure where that information originated. The only real limitations, other than software, would be power supply and bus length/capacitance. If you're powering the devices parasitically you will likely need an external pass transistor to provide power during conversions. The sensors require 1.5 mA each during conversion. I'm not sure how the drivers are implemented on the BBB, but I presume they are bit-banging a port pin. Probably not the best way to do it... If it were me, I would interface to the 1-wire bus with one of the handy interface devices available from Maxim. The DS2482-100 and DS2482-800 are I2C to 1-wire and I2C to 1-wire X 8 interfaces respectively. They also have a UART to 1-wire, the DS2480B. Also there is a USB to 1-wire dongle (DS2490R) which works quite nicely. I'm not sure what the deal is with Linux drivers, though. On Wednesday, April 1, 2015 at 9:44:11 AM UTC-4, [email protected] wrote: > > Hello, > > I use my BeagleBord Black to monitor my heating-system. > I use DS18S20 as temperature sensors. > > In the moment there are 7 sensors connected but I need more of them. The > 1-wire bus supports only 10. > > How can I have an other pin as a 1-wire-bus-master ? > > BTW: I describe my system on my webpage: > http://www.powershell.pub/ds18b20/ > It is in German language... > > Thank you > Robert > > -- For more options, visit http://beagleboard.org/discuss --- You received this message because you are subscribed to the Google Groups "BeagleBoard" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. For more options, visit https://groups.google.com/d/optout.
