DS18B20 - Errors

[mihaium]

Hello

Sorry for my English.
I have un Sistem for the control of temperatures of the schoolroom.

i have one problem and i need your help.

I have 1 HomeTroller Zee S2 with 2 arduinos.
1 Arduino (Uno) have 4 x DS18B20. (5-6 m cable cat 5)
1 Arduino (Mega) have 1 x DS18B20.(with 8m cable cat 5)


With all the sensors have the Error.
I tried to connect DS18B20 with 1=GND, 2=OUT, 3="+" and 1 resistor 4,7K. After I change the resistor to 2,2K and 1K.
I tried to connect 1+3=GND and 2=OUT with 4,7K to "+" ( http://www.theengineeringprojects.co...0-arduino.html)

But .... nothing.
After same minuts the sensors is in Error (but not all the sensors in the same moments)

[DMcKnight]

Hello

Sorry for my English.
I have un Sistem for the control of temperatures of the schoolroom.

i have one problem and i need your help.

I have 1 HomeTroller Zee S2 with 2 arduinos.
1 Arduino (Uno) have 4 x DS18B20. (5-6 m cable cat 5)
1 Arduino (Mega) have 1 x DS18B20.(with 8m cable cat 5)


With all the sensors have the Error.
I tried to connect DS18B20 with 1=GND, 2=OUT, 3="+" and 1 resistor 4,7K. After I change the resistor to 2,2K and 1K.
I tried to connect 1+3=GND and 2=OUT with 4,7K to "+" ( http://www.theengineeringprojects.co...0-arduino.html)

But .... nothing.
After same minuts the sensors is in Error (but not all the sensors in the same moments)

The first thing I would try is to hook up a single sensor with very short wires and see if that works. Once that is working you can gradually extend things.

I have three of these sensors on about 15m of cat 6 cable connected to an Ardino UNO. The pull-up resistor is about 1.5k. I get occasional errors, but it is mostly ok. I catch the errors in a simple script that I can post if it is helpful.

Regards
Doug

[mihaium]

Thanks for your response.
I tried 1 sensor and is ok.
Now i have 2 sensors and the resistor 1,5 k and i have the occasional error.

Is possible send me your script for this error, please?

Thanks

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