[SOLVED] Temp sensor DS18B20 on STM32 sometimes read 85

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fredbox
Posts: 98
Joined: Thu Dec 19, 2019 3:05 am
Answers: 2

Re: Temp sensor DS18B20 on STM32 sometimes read 85

Post by fredbox »

Assuming the schematic is for a carrier board that holds the blue pill board, I would first power the blue pill separately and just hook up the sensor. If that works, I would hook up the other used pins one at a time until the problem reappears.

I read somewhere that the pins going to the crystals needed to be removed before plugging into another circuit.

mrburnette
Posts: 324
Joined: Thu Dec 19, 2019 1:23 am
Answers: 1

Re: Temp sensor DS18B20 on STM32 sometimes read 85

Post by mrburnette »

Are you "really" supplying +5V from DC-DC to the 3.3V uC as shown in the schematic?

dinihuygens
Posts: 13
Joined: Thu Dec 17, 2020 9:20 am
Answers: 1

Re: Temp sensor DS18B20 on STM32 sometimes read 85

Post by dinihuygens »

mrburnette wrote:
Thu Jan 14, 2021 1:34 pm
Are you "really" supplying +5V from DC-DC to the 3.3V uC as shown in the schematic?
yeaaa :shock:

dinihuygens
Posts: 13
Joined: Thu Dec 17, 2020 9:20 am
Answers: 1

Re: [SOLVED] Temp sensor DS18B20 on STM32 sometimes read 85

Post by dinihuygens »

thanks all, finally I can overcome this issue by changing the wire cable of my sensor :D
I just cut it off and replace it with the new one

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