In a project I am using six DS18B20 temperature sensors on a Teensy 3.6.
I'm using the 'local power' approach in which I am powering the DS8B20's from the 3.3V out pin from the Teensy.
Furthermore I have a 4,7 kOhm pullup in place between this 3.3V power source and the signal.
It all worked fine until a sensor warmed up.
I saw a value of 38 degrees and then jumping to 85 degrees.
Then the Teensy 'went offline'. All processes stopped and it disappeared from USB and no serial connection was possible etc.
Online I found:
"The power-on reset value of the temperature register is +85°C"
So I guess it got in power-on reset.
Hope you can think along in what is happening here. My questions are:
I'm using the 'local power' approach in which I am powering the DS8B20's from the 3.3V out pin from the Teensy.
Furthermore I have a 4,7 kOhm pullup in place between this 3.3V power source and the signal.
It all worked fine until a sensor warmed up.
I saw a value of 38 degrees and then jumping to 85 degrees.
Then the Teensy 'went offline'. All processes stopped and it disappeared from USB and no serial connection was possible etc.
Online I found:
"The power-on reset value of the temperature register is +85°C"
So I guess it got in power-on reset.
Hope you can think along in what is happening here. My questions are:
- Why is it upsetting the Teensy?
- Is it perhaps a faulty or broken sensor?
- Is the 4,7 kOhm too high when powering it with 3,3V instead of 5V and should I reduce that to 3,3 kOhm to again have 1 mA current (now only 0,7mA)?
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