I am trying to connect 2 Temperature sensors ( DS18B20 ) to 1 Wire FMB 130 .
I connected the sensors as schema .
At the begining the sensors work fine for a few minutes but after that they are burn ( I did’nt know the reason )and stopped working at all .
What I should do ?
Should I add pull up resistor betwen DQ and VCC as I read in some article .
If I need the pull up resistor , is it needed only if the cable length more than 10m or in any length ?
Can I fix this If I used external power supply 5v instead of 1 wire power ?