QMC5883L temperature sensor

[wilhe_jo]

Hi!

Anyone got a temper reading from the QMC5883L?

The magnetic sensor part seems to give me reasonable values, but the temperature always reads 0.

Regards,
    Johann

[rooppoorali]

I didn't see anyone using  QMC5883L for temperature reading. I think for temperature reading, It's better to add an LM35 to the setup for dependable readings.
https://www.theengineeringprojects.com/2019/01/introduction-to-lm35.html

[DavidAlfa]

What kind of answer is that? It has temperatuire sensor, so it should be usable:

Code: [Select]

9.2.3 Temperature Data Registers
Registers 07H-08H store temperature sensor output data. 16 bits temperature sensor output is in 2’s complement.
Temperature sensor gain is factory-calibrated, but its offset has not been compensated, only relative temperature
value is accurate. The temperature coefficient is about 100 LSB/℃

Are you reading regs 0x07 & 0x08? Are they both reading 0?

[rooppoorali]

What kind of answer is that? It has temperatuire sensor, so it should be usable:

Code: [Select]

9.2.3 Temperature Data Registers
Registers 07H-08H store temperature sensor output data. 16 bits temperature sensor output is in 2’s complement.
Temperature sensor gain is factory-calibrated, but its offset has not been compensated, only the relative temperature
value is accurate. The temperature coefficient is about 100 LSB/℃

Are you reading regs 0x07 & 0x08? Are they both reading 0?

I did not say that the QMC5883L's in-built temperature sensor can't be used. I meant that it's not convenient and may not be always accurate. For example,  in one of my projects I had a Barometric Pressure Sensor BMP-180. It could output Pressure and temperature, both. Still, I had to add a separate temperature and humidity sensor to my project. I noticed a significant difference between the temperature readings of  BMP-180 and the other sensor. The BMP-180's reading was nowhere close to the real one. Later, I came of know that BMP-180 was not dependable for temperature readings.  Anyway, if anybody has  succeeded in getting the correct temperature value from QMC5883L, I'd love to know the method too.