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by dinihuygens
Fri Jan 15, 2021 6:16 am
Forum: General discussion
Topic: [SOLVED] Temp sensor DS18B20 on STM32 sometimes read 85
Replies: 13
Views: 457

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

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
by dinihuygens
Fri Jan 15, 2021 4:44 am
Forum: General discussion
Topic: [SOLVED] Temp sensor DS18B20 on STM32 sometimes read 85
Replies: 13
Views: 457

Re: Temp sensor DS18B20 on STM32 sometimes read 85

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:
by dinihuygens
Thu Jan 14, 2021 4:04 am
Forum: General discussion
Topic: [SOLVED] Temp sensor DS18B20 on STM32 sometimes read 85
Replies: 13
Views: 457

Re: Temp sensor DS18B20 on STM32 sometimes read 85

fpiSTM wrote:
Thu Jan 07, 2021 9:14 am
Tested too on several boards with different MCU and it works.
I guess it is more a wiring issue (resistor?).
You can also try with https://github.com/PaulStoffregen/OneWire
I have tried this, but the output sometimes -127 and sometimes 85
by dinihuygens
Thu Jan 14, 2021 3:16 am
Forum: General discussion
Topic: [SOLVED] Temp sensor DS18B20 on STM32 sometimes read 85
Replies: 13
Views: 457

Re: Temp sensor DS18B20 on STM32 sometimes read 85

PB5 - I copied and pasted your code without any modification. +------+ | Vcc |---+-----+------> 3.3V | | | | | | | | | 4.7K resistor | | | | | Data |---------+------> PB5 | | | | | --- | | --- 0.1uf capacitor | | | | GND |---+------------>GND +------+ DS18B20 Mine is one of those waterproof sensors...
by dinihuygens
Thu Jan 14, 2021 3:15 am
Forum: General discussion
Topic: [SOLVED] Temp sensor DS18B20 on STM32 sometimes read 85
Replies: 13
Views: 457

Re: Temp sensor DS18B20 on STM32 sometimes read 85

From https://forum.arduino.cc/index.php?topic=201863.msg1488781#msg1488781 There is a footnote on page 4 which says "The power-on reset value of the temperature register is +85°C." so if you read 85 degrees it means it hasn't done a conversion since the last power on. You hadn't wired it up properl...
by dinihuygens
Thu Jan 14, 2021 3:12 am
Forum: General discussion
Topic: [SOLVED] Temp sensor DS18B20 on STM32 sometimes read 85
Replies: 13
Views: 457

Re: Temp sensor DS18B20 on STM32 sometimes read 85

Sorry, it might be late. I still working on this issue. I have tried to change my PCB design too but still can't overcome this issue. Anyway, I have tried in a breadboard, and same as you guys it worked as well. I don't know why it doesn't work on PCB, I did the same wiring as I did on a breadboard....
by dinihuygens
Thu Jan 07, 2021 3:59 am
Forum: General discussion
Topic: [SOLVED] Temp sensor DS18B20 on STM32 sometimes read 85
Replies: 13
Views: 457

[SOLVED] Temp sensor DS18B20 on STM32 sometimes read 85

I'm using a temperature sensor DS18B20 with STM32F103 Bluepill, but sometimes this sensor gives me 85°C which is the power-on reset value of the temperature register. I'm so confused because sometimes it can give me the correct value but mostly is 85°C. I have put a 4.7K resistor as the pull-up resi...
by dinihuygens
Thu Jan 07, 2021 3:30 am
Forum: Projects
Topic: DS18B20 on STM32F103C8
Replies: 7
Views: 373

Re: DS18B20 on STM32F103C8

can we use this OneWireSTM library if our core is Arduino_STM32 core (not the rogerclark one)?
by dinihuygens
Fri Dec 18, 2020 6:49 am
Forum: General discussion
Topic: [Solved] Multiple serial port at the same time doesn't work
Replies: 5
Views: 694

Re: Multiple serial port at the same time doesn't work

so nice of you guys, thank you it's solved. I was wrong choosing my board part number :|
I have made a little change to my code above in case someone needs it ;)

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