Hello,
Well I have found why it’s happening. I conclude owfs is not handling passive
devices correctly
So.. NOT in passive mode, i.e. all three legs of the temperature sensor
connected, and a 4.7k pull up on the data line, Both
/sys/bus/w1/DEVICE/temperature returns correct temperature. The same is true
for owserver, when owread is run the correct temperature is returned.
Now… I rewire the temperature sensor to two wires, GND pin and VDD pin shorted
to GND and the data pin with a 4.7k pullup to +3.3V.
So Passive mode, /sys/bus/w1/DEVICE/temperature returns correct temperature,
however owserver with owread return 85c, thus I would surmise that owserver is
not handing passive devices correctly.
Also /boot/config.txt has the correct definition in it.
dtoverlay=w1-gpio,gpiopin=4,pullup=on
I ran the test several times, rebooting each time. I also rewired the same
sensor each time!
John
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