BME680 example gives zero values for temp, humidity and pressure with ESP32

[bastianhjaeger]

Device type

• [x] ESP32 (DOIT dev board) --> with error
• [ ] ESP8226 (ESP12f) --> working

Framework version

• [x] ESP-IDF 3a9228fa02e933a28b15a335480fcc5e6f9d567a
• [x] esp-idf-lib 438dbbb21fe506dc895c972031f9e19a3d8fcf40

Describe the bug I am seeing different results running the BME680 example code on an ESP12f and ESP32. Siee los attached.

Both chips recognize the sensor via I2C, but the ESP32 keeps converting the RAW data to zero

D (1774) BME680: Started measurement
D (1924) BME680: Raw data: 505721 524288 20095 873 8
D (1924) BME680: Fixed point sensor values - 0/100 deg.C, 0/1000 %, 0 Pa, 24661 Ohm
BME680 Sensor: 0.00 °C, 0.00 %, 0.00 hPa, 24661.00 Ohm

The ESP12f on the other hand works fine:

D (2458) BME680: Started measurement
D (2599) BME680: Raw data: 502435 524288 20547 462 10
D (2601) BME680: Fixed point sensor values - 2704/100 deg.C, 50947/1000 %, 0 Pa, 8099 Ohm
BME680 Sensor: 27.04 °C, 50.95 %, 0.00 hPa, 8099.00 Ohm

The BME is powerd by 3.3V from the board. I an not sure if there could be something in the sdkconfig that messes up the configuration of the sensor / i2c, but I can not imagine what that would be.

sdkconfig.defaults.esp12f.txt sdkconfig.defaults.esp32.txt esp12f.log esp32.log

[UncleRus]

Hmmm... Could you print contents of dev->calib_data (bme680_calib_data_t) for esp32?

[bastianhjaeger]

Interesting idea. My code from the esp8266 and the esp32 only differ by the pins.

Not sure it there need to be more. But you are right.

BME680 Sensor: 0.00 °C, 0.00 %, 0.00 hPa, 14696.00 Ohm
sensor.calib_data.par_t1:  0
sensor.calib_data.par_t2:  0
sensor.calib_data.par_t3:  0
sensor.calib_data.par_p1:  0
sensor.calib_data.par_p2:  0
sensor.calib_data.par_p3:  0
sensor.calib_data.par_p4:  0
sensor.calib_data.par_p5:  0
sensor.calib_data.par_p7:  0
sensor.calib_data.par_p6:  0
sensor.calib_data.par_p8:  0
sensor.calib_data.par_p9:  0
sensor.calib_data.par_p10: 0
sensor.calib_data.par_h1:  0
sensor.calib_data.par_h2:  0
sensor.calib_data.par_h3:  0
sensor.calib_data.par_h4:  0
sensor.calib_data.par_h5:  0
sensor.calib_data.par_h6:  0
sensor.calib_data.par_h7:  0
sensor.calib_data.par_gh1: 0
sensor.calib_data.par_gh2: 0
sensor.calib_data.par_gh3: 0
sensor.calib_data.t_fine:  0
sensor.calib_data.res_heat_range: 1
sensor.calib_data.res_heat_val:   40
sensor.calib_data.range_sw_err:   1

On the ESP8266 it looks like this:

BME680 Sensor: 26.27 °C, 53.63 %, 0.00 hPa, 7098.00 Ohm
sensor.calib_data.par_t1:  26046
sensor.calib_data.par_t2:  26464
sensor.calib_data.par_t3:  3
sensor.calib_data.par_p1:  36756
sensor.calib_data.par_p2:  -10489
sensor.calib_data.par_p3:  88
sensor.calib_data.par_p4:  7111
sensor.calib_data.par_p5:  -73
sensor.calib_data.par_p7:  52
sensor.calib_data.par_p6:  30
sensor.calib_data.par_p8:  -3839
sensor.calib_data.par_p9:  -2109
sensor.calib_data.par_p10: 30
sensor.calib_data.par_h1:  685
sensor.calib_data.par_h2:  1027
sensor.calib_data.par_h3:  0
sensor.calib_data.par_h4:  45
sensor.calib_data.par_h5:  20
sensor.calib_data.par_h6:  120
sensor.calib_data.par_h7:  -100
sensor.calib_data.par_gh1: -50
sensor.calib_data.par_gh2: -6339
sensor.calib_data.par_gh3: 18
sensor.calib_data.t_fine:  134478
sensor.calib_data.res_heat_range: 1
sensor.calib_data.res_heat_val:   41
sensor.calib_data.range_sw_err:   15

So what can this mean?

[UncleRus]

Calibration data seems to be read or interpreted incorrectly. Could you dump contents of uint8_t buf[BME680_CDM_SIZE] (bme680_init_sensor()) after reading it at line 580 in bme680.c?

[bastianhjaeger]

Interesting. It seems like the dumping between the i2c readings solves the problem. See the screenshot. As soon as I remove the buffer dumping, the problem appears again.

Here the interim result. I will investigate this later today.

Code:

ESP32 result:

#0 dump uint8_t buf[BME680_CDM_SIZE] 
0x30 0x0d 0x80 0x30 0x7f 0xfb 0x3f 0x60 0x7f 0xfb 0x3f 0x40 0x42 0x0f 0x00 0xa5 0xa5 0xa5 0xa5 0xa5 0xa5 0xa5 0xa5 0xa5 0xa5 0xa5 0xa5 0xa5 0xa5 0xa5 0xa5 0xd2 0x8a 0x08 0x80 0x10 0x57 0xfb 0x3f 0xa8 0x23 0xfb 0x3f 0x4c 0x64 0xfb 0x3f 0x50 0x58 
  48   13  128   48  127  251   63   96  127  251   63   64   66   15    0  165  165  165  165  165  165  165  165  165  165  165  165  165  165  165  165  210  138    8  128   16   87  251   63  168   35  251   63   76  100  251   63   80   88 

#1 dump uint8_t buf[BME680_CDM_SIZE] 
0x80 0x60 0x67 0x03 0x0f 0x94 0x8f 0x07 0xd7 0x58 0xff 0xc7 0x1b 0xb7 0xff 0x34 0x1e 0x00 0x00 0x01 0xf1 0xc3 0xf7 0x1e 0x01 0xa5 0xa5 0xa5 0xa5 0xa5 0xa5 0xd2 0x8a 0x08 0x80 0x10 0x57 0xfb 0x3f 0xa8 0x23 0xfb 0x3f 0x4c 0x64 0xfb 0x3f 0x50 0x58 
 128   96  103    3   15  148  143    7  215   88  255  199   27  183  255   52   30    0    0    1  241  195  247   30    1  165  165  165  165  165  165  210  138    8  128   16   87  251   63  168   35  251   63   76  100  251   63   80   88 

#2 dump uint8_t buf[BME680_CDM_SIZE] 
0x80 0x60 0x67 0x03 0x0f 0x94 0x8f 0x07 0xd7 0x58 0xff 0xc7 0x1b 0xb7 0xff 0x34 0x1e 0x00 0x00 0x01 0xf1 0xc3 0xf7 0x1e 0x01 0x40 0x3d 0x2a 0x00 0x2d 0x14 0x78 0x9c 0xbe 0x65 0x3d 0xe7 0xce 0x12 0x5b 0x00 0xfb 0x3f 0x4c 0x64 0xfb 0x3f 0x50 0x58 
 128   96  103    3   15  148  143    7  215   88  255  199   27  183  255   52   30    0    0    1  241  195  247   30    1   64   61   42    0   45   20  120  156  190  101   61  231  206   18   91    0  251   63   76  100  251   63   80   88 

#3 dump uint8_t buf[BME680_CDM_SIZE] 
0x80 0x60 0x67 0x03 0x0f 0x94 0x8f 0x07 0xd7 0x58 0xff 0xc7 0x1b 0xb7 0xff 0x34 0x1e 0x00 0x00 0x01 0xf1 0xc3 0xf7 0x1e 0x01 0x40 0x3d 0x2a 0x00 0x2d 0x14 0x78 0x9c 0xbe 0x65 0x3d 0xe7 0xce 0x12 0x5b 0x00 0x29 0xaa 0x16 0xcb 0xf3 0xfc 0x62 0x67 
 128   96  103    3   15  148  143    7  215   88  255  199   27  183  255   52   30    0    0    1  241  195  247   30    1   64   61   42    0   45   20  120  156  190  101   61  231  206   18   91    0   41  170   22  203  243  252   98  103 

W (330) BME680: Heater is not stable

ESP8266:

#0 dump uint8_t buf[BME680_CDM_SIZE] 
0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x50 0xcd 0xfe 0x3f 0x6d 0x24 0x21 0x40 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0x00 0xf0 0xcb 0xfe 0x3f 0x8c 0x24 0x21 0x40 0xa5 0xa5 0xa5 0xa5 0xa5 0xa5 0xa5 0xa5 0xf0 0xcb 0xfe 0x3f 0x84 0xdc 0x21 0x40 0xa5 0xa5 
   0    0    0    0    0    0    0   80  205  254   63  109   36   33   64    0    0    0    0    0    0    0    0  240  203  254   63  140   36   33   64  165  165  165  165  165  165  165  165  240  203  254   63  132  220   33   64  165  165 

#1 dump uint8_t buf[BME680_CDM_SIZE] 
0x40 0xe6 0x66 0x03 0x2f 0x64 0x91 0xdc 0xd6 0x58 0xff 0x4e 0x20 0x75 0xff 0x3b 0x1e 0x00 0x00 0x83 0xed 0x32 0xf9 0x1e 0x02 0xfe 0x3f 0x8c 0x24 0x21 0x40 0xa5 0xa5 0xa5 0xa5 0xa5 0xa5 0xa5 0xa5 0xf0 0xcb 0xfe 0x3f 0x84 0xdc 0x21 0x40 0xa5 0xa5 
  64  230  102    3   47  100  145  220  214   88  255   78   32  117  255   59   30    0    0  131  237   50  249   30    2  254   63  140   36   33   64  165  165  165  165  165  165  165  165  240  203  254   63  132  220   33   64  165  165 

#2 dump uint8_t buf[BME680_CDM_SIZE] 
0x40 0xe6 0x66 0x03 0x2f 0x64 0x91 0xdc 0xd6 0x58 0xff 0x4e 0x20 0x75 0xff 0x3b 0x1e 0x00 0x00 0x83 0xed 0x32 0xf9 0x1e 0x02 0x40 0xe1 0x27 0x00 0x2d 0x14 0x78 0x9c 0x50 0x66 0x49 0xe7 0xc9 0x12 0x5b 0x00 0xfe 0x3f 0x84 0xdc 0x21 0x40 0xa5 0xa5 
  64  230  102    3   47  100  145  220  214   88  255   78   32  117  255   59   30    0    0  131  237   50  249   30    2   64  225   39    0   45   20  120  156   80  102   73  231  201   18   91    0  254   63  132  220   33   64  165  165 

#3 dump uint8_t buf[BME680_CDM_SIZE] 
0x40 0xe6 0x66 0x03 0x2f 0x64 0x91 0xdc 0xd6 0x58 0xff 0x4e 0x20 0x75 0xff 0x3b 0x1e 0x00 0x00 0x83 0xed 0x32 0xf9 0x1e 0x02 0x40 0xe1 0x27 0x00 0x2d 0x14 0x78 0x9c 0x50 0x66 0x49 0xe7 0xc9 0x12 0x5b 0x00 0x28 0xaa 0x16 0x4c 0x13 0x03 0x66 0x6c 
  64  230  102    3   47  100  145  220  214   88  255   78   32  117  255   59   30    0    0  131  237   50  249   30    2   64  225   39    0   45   20  120  156   80  102   73  231  201   18   91    0   40  170   22   76   19    3  102  108 

W (510) BME680: Heater is not stable

Same code on both devices. Same sensor device used for both tests.

[bastianhjaeger]

@UncleRus I found a "fix" with all your hints. Increasing BME680_RESET_PERIOD from 5 to 10 ms or adding an extra 10 ms delay before the read calls (i2c_dev_read_reg(..)) around line 582 of bme680.c helps.

[UncleRus]

Great! Thank you!