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Interfacing ds18b20 with raspberry pi

113.91.127.118

makiyang614@gmail.com

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

The date sheet of ds18b20 (Open in New Window)

Follow Ups:

Remote thermometer - bare 10:14:18 06/27/17 (0)
I have one of these stoopid simple devices...and it works!
https://www.amazon.com/AcuRite-00782A2-Wireless-Outdoor-Thermometer/dp/B0009Y7RPS/ref=sr_1_4?ie=UTF8&qid=1498583546&sr=8-4&keywords=remote+thermometer

My Pi is just a Time waster.. I've finally realised
You might want to try.... - AbeCollins 09:52:01 06/27/17 (0)
You might want to try a Raspberry Pi DIY website and not an audio forum. Just a thought.
On the plus side... - Ivan303 07:56:04 06/27/17 (0)
at least it's not a post about MQA. :-)

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