1 Wire Search Routine

A while back I wrote a bit of code to search a 1 WIRE BUS to find the device rom numbers and store them into ram for future use. Attached is the basic routine I used based on the application notes form Dallas Semiconductor. The storage array can be made larger or smaller as you wish. I have successfully been able to locate upto 32 nodes made up of 5 different types of Dallas products. The only thing needs to be added to the program are the LCD Defines. This was written for a 2 X 40 display connected to a 18F452 @ 40 Mhz. After looking at how many times the attached routine was downloaded I decided to put it in the software section. Hope this helps you 1 wire guy's....

Dave Purola, N8NTA

Hi, I've no experience in getting the info from more than one sensor, but I've found some other approach to the DS18B20.
Seems that:

Code:

---

Temp  VAR WORD       
ID        VAR BYTE[8]      '64 bit memory array

OWOUT Pin, 1, [$33]        'This read the internal eeprom of the sensor
OWIN Pin, 0,[STR ID\8]      'Save the result into a 8 byte array

SELECT CASE ID[0]
        CASE $28
                'a DS18B20 has been found
               
        CASE $10
                'a DS18S20 has been found
               
END SELECT

OWOUT Pin, 1, [$CC, $44]                        ' Jump the ROM and convert
PAUSE 900                                      ' Give enough time for conversion (you could reduce it using 10 bit resolution)
OWOUT Pin, 1, [$CC, $BE]' Jump the ROM and read
OWIN  Pin, 2, [Temp.Lowbyte, Temp.Highbyte] ' Read 2 bytes

---

As said I've not experience in using more than one of those sensor, but probably there is a way to choose wich one using the data of the internal EEPROM.
If you get some result, please post your experience for future use.

There might be something of use for you here...
http://www.picbasic.co.uk/forum/cont...r-nine-of-them

thanks everybody for the assistance.
I suggest the indication provided by Heckler:
http://www.picbasic.co.uk/forum/cont...r-nine-of-them

Thanks again.
Ambrogio