avr + 1wire

[max_buddy]

hi
i'm having a problem with a ds18b20 sensor and an atmega8l @ 4mhz (tested at 8 too).

 testing using bascom and the device enumeration (1wirecount function) returns 0 devices. also the err value is 1.
the exact problem appears on bascom's website but without a solution. i have tested with 2 sensors so i't not likely both are broken.

http://www.mcselec.com/index2.php?option=com_forum&Itemid=59&page=viewtopic&t=762&highlight=1wirecount

http://www.mcselec.com/index2.php?option=com_forum&Itemid=59&page=viewtopic&t=1673&highlight=1wirecount

http://www.serasidis.gr/forums/forum_posts.asp?PN=1&TID=70

the sensor is properly connected, there is a pull-up resistor and so on. anyone has another idea?
many thanks

[karthikeyan_sw]

put a scope to grab the signals if you dont have scope then create the same circuit in proteus simulator and then try debugging using the oscilloscopes.

[max_buddy]

too bad i don't have a scope... it works in proteus
so probably i've got 2 broken sensors.... damn

[bugmike25]

Because it works in Proteus deos not mean it works on your hardware.  I designed and tested an 8051 MCU interfaced with a DS18S20 temp. sensor.  It worked fine on the hardware but didnt work when tested using proteus.  The best way to check if the sensors are damaged is by using a scope and see if the output voltage is changing on the data line.

[max_buddy]

ok, thanks for replys
i'll try to get my hands on a scope to check the sensors