BMP280 Compensated temperature always zero

[MartinLauko]

Hi,

I have a BMP280 shuttle board connected to a ESP32 using I2C.

Using the Bosh BMP280 API i can initialize, configure and read measured data. I can see the raw output of pressure and temperature changes over time.

The problem is that the raw registers values of the trimming parameters (i.e. registers 0x88+) have the first 6 bytes zeros. This causes the compensated temperature to be zero. And also t_fine is zero so the compensated pressure is off.

I have two BMP280 shuttle boards. Tested both, one at a time, they both have the same problem.

Are these sensors faulty or am i doing something wrong?

For refference here is a raw readout of the trimming parameters for both sensors.

Left most is 0x88. Each line is different BMP280. Values are decimal 0-255.

0	0	0	0	0	0	34	150	206	213	208	11	199	255	107	1	249	255	140	60	248	198	112	23
0	0	0	0	0	0	0	150	185	213	208	11	214	5	184	0	249	255	140	60	248	198	112	23

[handytech]

Would you be able to share some more details about your setup? For example schematic of the sensors' connections, code snippet of the sensor API usage, eventually even a logic analyzer capture of the trimming parameters read-out when using the sensor API?

[shellywang]

Please  read the chip ID to ensure if the reading from I2C is correct or not,check whether HW connection issue.

[MartinLauko · Accepted solution]

The issue has been resolved.

It was a software problem. Updating the underlying framework (ESP-IDF) was needed.

Thank you for your time and helpfull suggestions.