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Interfacing ds18b20 with raspberry pi

i have a raspberry pi connected with two ds18b20 temperature sensor. -sensor1 is fixed on the outside of my garage (distance 20m from raspberry pi) -sensor2 is just connected in a breadboard near the raspberry pi. Everything is working well.

I decided to add sensor3 located outside and from 20m from the raspberry pi.

Now when i type : cd /sys/bus/w1/devices

if find this: c0-40a000061005 c2-246056869800 c2-247056869000 d0-008000001000 w1_bus_master1

instead of : 28-..... 28-..... 28-.....

each sensor ref should be start with 28-.....

what is happening with my sensors? If unplugged the sensor1, then everything is well

if i unplug the sensor3 and let only sensor1 and sensor2 everything is well.

Which modification do we have to do when sensor are located far from the raspberry pi?

thank you

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Topic - Interfacing ds18b20 with raspberry pi - makiyang614@gmail.com 01:23:23 06/27/17 (3)


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