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by wgfaes
Thu May 16, 2019 4:55 pm
Forum: Automation, sensing and robotics
Topic: DS18B20: Influence of supply voltage on temperature
Replies: 21
Views: 1219

Re: DS18B20: Influence of supply voltage on temperature

Hello again, I just tested the connection as suggested by pcmanbob. The sensors works and my Pi doens't break. However, when I switch Vcc between 3V3 and 5V, reading immediately changes with approximately 1 degree (higher on 5V). It would surprise me if it was because of the internal heating of the ...
by wgfaes
Thu May 16, 2019 9:11 am
Forum: Automation, sensing and robotics
Topic: DS18B20: Influence of supply voltage on temperature
Replies: 21
Views: 1219

Re: DS18B20: Influence of supply voltage on temperature

Hello,

Thanks for the clarification. That solves the question for me.
I'm gonna test it when I get home tonight.

Willem
by wgfaes
Wed May 15, 2019 9:08 pm
Forum: Automation, sensing and robotics
Topic: DS18B20: Influence of supply voltage on temperature
Replies: 21
Views: 1219

Re: DS18B20: Influence of supply voltage on temperature

Hello all, Thank you for the quick replies. To answer rpdom's question: I am considering of supplying the sensors with 5V (and the same resistor between Vdd and data). I assume you mean the resistor is still between Vdd 3.3V and data, otherwise you will end up with a dead Pi. Yes, I did connect the ...
by wgfaes
Wed May 15, 2019 8:19 am
Forum: Automation, sensing and robotics
Topic: DS18B20: Influence of supply voltage on temperature
Replies: 21
Views: 1219

DS18B20: Influence of supply voltage on temperature

Hello, I am currently configuring a setup where I measure different temperatures with a raspberry pi 3 B+ with a several DS18B20 sensors. At first, I used 3.3V as Vdd, with a 4K7 resistor between Vdd and data-line. Since the cables can become quite long (up to 10m), I am considering of supplying the...

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