B4R Question Sensor ds18b20 strange readings

[Cesar_Morisco]

Hello everyone, everything good
I am using ds18b20 sensor on esp8266
When the Temperature exceeds 128 degrees it starts showing Negative Temperature - 123 degrees. Can anyone tell me. Thanks.
Using this example

Temperature sensors comparison - DS18B20 vs DHT11

SubName: Comparing the DS18B20 and the DHT11 temperature sensors at the exact same time. Description: This is just a quick comparison between the two above named temperature sensors, nothing special really. I was looking through my Arduino parts toolbox when I suddenly realised that I had two...

www.b4x.com

 

[hatzisn]

Hello everyone, everything good
I am using ds18b20 sensor on esp8266
When the Temperature exceeds 128 degrees it starts showing Negative Temperature - 123 degrees. Can anyone tell me. Thanks.
Using this example

Temperature sensors comparison - DS18B20 vs DHT11

SubName: Comparing the DS18B20 and the DHT11 temperature sensors at the exact same time. Description: This is just a quick comparison between the two above named temperature sensors, nothing special really. I was looking through my Arduino parts toolbox when I suddenly realised that I had two...

www.b4x.com

I have never used it but what you have mentioned forces me to think that it presents the temperature as signed byte. Try to assign to a ubyte variable the result of Bit.And(temperature, 0xff).

 

[Cesar_Morisco]

I have never used it but what you have mentioned forces me to think that it presents the temperature as signed byte. Try to assign to a ubyte variable the result of Bit.And(temperature, 0xff).

Hi Hatzis How are you?
I think the ds18b20 limit is -55 to 125, even from the research I did
I need a sensor that reads from 0 to 300 degrees
Thank you from the bottom of my heart for your answer

fotos
When the temperature goes above 128 it becomes negative

 

[Cableguy]

You can try a 300+°C capable 3D printing Nozle termistor.... They are analog though

 

[rbghongade]

Hi
You can use MAX31865 with RTD or MAX31855 with thermocouple for measuring high temperatures. Libraries for both are available for Arduino and we can use them with inline C with B4R. I have used RTD successfully.

 

[hatzisn]

Hi Hatzis How are you?
I think the ds18b20 limit is -55 to 125, even from the research I did
I need a sensor that reads from 0 to 300 degrees
Thank you from the bottom of my heart for your answer

fotos
When the temperature goes above 128 it becomes negative

I was not aware of this. Thanks. I suppose my assumption was completely wrong.

 

[thetrueman]

Hi
You can use MAX31865 with RTD or MAX31855 with thermocouple for measuring high temperatures. Libraries for both are available for Arduino and we can use them with inline C with B4R. I have used RTD successfully.

Additionally MAX6675 is also Thermocouple Temperature Measurement IC.
Maybe it compete MAX31855 in some features or price. I use it and have good results. Good luck...

 

[Cesar_Morisco]

You can try a 300+°C capable 3D printing Nozle termistor.... They are analog though

Hello Cableguy how are you?
Thanks for your response.
A hug

 

[Cesar_Morisco]

Hi
You can use MAX31865 with RTD or MAX31855 with thermocouple for measuring high temperatures. Libraries for both are available for Arduino and we can use them with inline C with B4R. I have used RTD successfully.

Hello rbghongade how are you?
Thanks for your response.
A hug

 

[Cesar_Morisco]

Additionally MAX6675 is also Thermocouple Temperature Measurement IC.
Maybe it compete MAX31855 in some features or price. I use it and have good results. Good luck...

Hello thetrueman how are you? Thanks for your response. A hug