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by Electronique
Mon Jul 01, 2019 6:13 pm
Forum: Automation, sensing and robotics
Topic: DS18B20: Influence of supply voltage on temperature
Replies: 21
Views: 1440

Re: DS18B20: Influence of supply voltage on temperature

Nope. Like I said, the same device gives different readings when moved between Pi and Arduino. In this situation the supply voltage is either 3v3 or 5v0 from power up. All five new devices behave this way but the original older two devices can be happily moved between Pi and Arduino and still read c...
by Electronique
Tue Jun 25, 2019 8:03 pm
Forum: Interfacing (DSI, CSI, I2C, etc.)
Topic: 1-Wire Ds18B20 temperature sensor disappearing when over 60°C
Replies: 7
Views: 744

Re: 1-Wire Ds18B20 temperature sensor disappearing when over 60°C

I'm intrigued as to what might be special about 60degC since you say it doesn't matter which sensor gets there first. Is it at all possible that the magic number is actually 64degC? 64 would be represented by a single '1' bit among 15 '0' bits and this could cause problems with the star network you ...
by Electronique
Tue Jun 25, 2019 7:13 pm
Forum: Automation, sensing and robotics
Topic: DS18B20: Influence of supply voltage on temperature
Replies: 21
Views: 1440

Re: DS18B20: Influence of supply voltage on temperature

I have the same problem. I have 2 much older DS18B20 devices and these operate totally independently of the supply voltage. But the most recent batch of 5 devices I bought all exhibit an immediate change to a higher reading when supplied from 5v compared with the reading at 3v3. I originally noticed...

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