Gas resistance values from BME688 on Thingy:53

RE: Gas resistance values from BME688 on Thingy:53

wass — Sat, 20 May 2023 17:45:05 GMT

Hi,
I have a developed a Thingy53 project https://github.com/HomeSmartMesh/sdk-hsm-thingy53 where I ported the BME688 vendor driver BME68x-Sensor-API to Zephyr. I also ported the vendor library to read the IAQ with their .a library Bosch-BSEC2-Library. It is not based on the existing Zephyr BME680 which does not work, but this is a complete rework which consists of :

BME688 Zephyr Driver : in hsm/drivers/sensor/bme688
- BME68x-Sensor-API vendor driver integration https://github.com/boschsensortec/BME68x-Sensor-API
- Using Zephyr's Sensor API in C language for usage in BME688 simple forced mode
- Driver extension functions to use BME688 in Parallel mode and get all x10 gas measures
BME688 Server : in hsm/subsys/bme688_server
- C++ wrapper to configure the BME688 usage in json structure (temperatures profile and durations)
- handler delivers the sensor results in a json structure (temperature, humidity, pressure, gas-0..gas-9)
- Bosch-BSEC2-Library .a vendor's binary integration for IAQ (Indoor Air Quality) measurements https://github.com/boschsensortec/Bosch-BSEC2-Library

The project has also the following, which makes it easy to use it in real case application

Mesh Network with OpenThread broadcasting UDP packets as client and running a sensors server.
C++ application with json inputs for config and outputs for sensors enables direct mapping to MQTT
RGB Led, Light color, Battery

See all samples, each one is a simple step project to check if things are working, 05_bme688, 06_bme688_parallel, 07_bme688_parallel_cpp, 08_bme688_bsec2 and 20_sensors_server which combines all features together.

I'm currently deploying and testing this project at home, if you or someone still have questions or feedback, let me know.
Here an overview about the driver and library integration, more details on the project readme.

RE: Gas resistance values from BME688 on Thingy:53

Sachin Rawat — Fri, 19 May 2023 05:55:54 GMT

Hi rtlab_hmkang

[quote userid="96681" url="~/f/nordic-q-a/98569/gas-resistance-values-from-bme688-on-thingy-53/420902"]I changed the source like this which are in "zephyr/drivers/sensor/bme680"[/quote]

I have followed and changed exactly what you have suggested, but It changes nothing in the Output,
My sensor's data output are showing the same values of the gas_res as it is showing earlier.

T: 28.970000; P: 98.190000; H: 39.239000; G: 12946860.000000

Can you please help me more to resolve the libraries?

Regards,

Sachin

RE: Gas resistance values from BME688 on Thingy:53

ujur007 — Thu, 20 Apr 2023 06:55:24 GMT

Sorry to jump in directly here but as I am also having Thingy:53 board and interested in BME688 driver.

I tried using the /bme680 driver example in the samples folder and faced the same issue. I think rtlab_hmkang is right that the driver needs to be modified for adjusting to BME688 sensor.

Another option is that Bosch also provides basic API to read sensor data. That could be also done but I have little experience on this front. I saw Edge-impulse firmware on Github has followed this direction.

RE: Gas resistance values from BME688 on Thingy:53

rtlab_hmkang — Tue, 18 Apr 2023 06:34:32 GMT

Hi DougR I had a same problem.

There's small difference between bme680 and bme688's register map.

If you want to use gas sensor, you should set "run_gas" register in GAS_1_CTRL (0x70).

However, ncs-zephyr's driver (which is in this directory : zephyr/drivers/sensor/bme680/bme680.c)
doesn't set the "run_gas" bit field.

Because It's been to long that I figured this problem, I'm not sure the register's address and value was correct. But I ensure that it is not appropriate to use directly zephyr's bme680 driver to bme688.

I changed the source like this which are in "zephyr/drivers/sensor/bme680"

=========== ORIGIN ===========

bme680.c

err = bme680_reg_write(dev, BME680_REG_CTRL_HUM, BME680_HUMIDITY_OVER);
	if (err < 0) {
		return err;
	}

	err = bme680_reg_write(dev, BME680_REG_CONFIG, BME680_CONFIG_VAL);
	if (err < 0) {
		return err;
	}

	err = bme680_reg_write(dev, BME680_REG_CTRL_GAS_1,
			       BME680_CTRL_GAS_1_VAL);
	if (err < 0) {
		return err;
	}

	err = bme680_reg_write(dev, BME680_REG_RES_HEAT0,
			       bme680_calc_res_heat(data, BME680_HEATR_TEMP));
	if (err < 0) {
		return err;
	}

bme680.h

#define BME680_CHIP_ID 0x61

#define BME680_LEN_FIELD     15
#define BME680_LEN_COEFF_ALL 42
#define BME680_LEN_COEFF1    23
#define BME680_LEN_COEFF2    14
#define BME680_LEN_COEFF3    5

=========== NEW ===========

bme680.c

	err = bme680_reg_write(dev, BME680_REG_CTRL_HUM, BME680_HUMIDITY_OVER);
	if (err < 0) {
		return err;
	}

	err = bme680_reg_write(dev, BME680_REG_CONFIG, BME680_CONFIG_VAL);
	if (err < 0) {
		return err;
	}

	// err = bme680_reg_write(dev, BME680_REG_CTRL_GAS_1,
	// 		       BME680_CTRL_GAS_1_VAL);
	// if (err < 0) {
	// 	return err;
	// }
	err = bme680_reg_write(dev, BME680_REG_CTRL_GAS_0,
			       0); // BME68X_ENABLE_HEATER	0x00
	if (err < 0) {
		return err;
	}

	uint8_t gas_1_ctrl_val;
	gas_1_ctrl_val = BME680_CTRL_GAS_1_VAL | 0xa0;
	err = bme680_reg_write(dev, BME680_REG_CTRL_GAS_1, gas_1_ctrl_val);
	if (err < 0) {
		return err;
	}

	err = bme680_reg_write(dev, BME680_REG_RES_HEAT0,
			       bme680_calc_res_heat(data, BME680_HEATR_TEMP));
	if (err < 0) {
		return err;
	}

bme680.h

// #define BME680_LEN_FIELD                15
#define BME680_LEN_FIELD     17
#define BME680_LEN_COEFF_ALL 42
#define BME680_LEN_COEFF1    23
#define BME680_LEN_COEFF2    14
#define BME680_LEN_COEFF3    5

Check the datasheet and register map I enveloped.
bme688 --> BME688 Datasheet (bosch-sensortec.com)

bme680 --> Newsletter-Template-DE (adafruit.com)

Sincerely,

RE: Gas resistance values from BME688 on Thingy:53

Øyvind — Wed, 12 Apr 2023 13:38:18 GMT

[quote user="DougR"]Software and build: in VSCode with nRF Connect plugin, Welcome>Create a new application, pick SDK 2.3.0, in Application Template pick zephyr/samples/sensor/bme680. Pick an application name. Then under Applications>bme680 (or whatever name), create build configuration with board thingy53_nrf5340_cpuapp_ns, otherwise default arguments, then Build Configuration[/quote]

Following your setup I was able to reproduce the issue on my side. Tested with Thingy:53 v0.7.0 og v1.0.0

    
//Thingy:53 v0.7.0

T: 25.780000; P: 99.532000; H: 23.314000; G: 12976914.000000
T: 26.070000; P: 99.527000; H: 22.937000; G: 12976914.000000
T: 26.370000; P: 99.527000; H: 22.528000; G: 12976914.000000
T: 26.630000; P: 99.523000; H: 22.151000; G: 12976914.000000
T: 26.860000; P: 99.527000; H: 21.812000; G: 12976914.000000
T: 27.080000; P: 99.525000; H: 21.489000; G: 12976914.000000
T: 27.270000; P: 99.523000; H: 21.195000; G: 12976914.000000
T: 27.430000; P: 99.525000; H: 20.908000; G: 12976914.000000
T: 27.620000; P: 99.527000; H: 20.686000; G: 12976914.000000
T: 27.790000; P: 99.528000; H: 20.496000; G: 12976914.000000
T: 27.950000; P: 99.525000; H: 20.298000; G: 12976914.000000
T: 28.100000; P: 99.525000; H: 20.119000; G: 12976914.000000
T: 28.270000; P: 99.527000; H: 19.947000; G: 12976914.000000
T: 28.410000; P: 99.527000; H: 19.757000; G: 12976914.000000
T: 28.530000; P: 99.525000; H: 19.574000; G: 12976914.000000
T: 28.650000; P: 99.523000; H: 19.404000; G: 12976914.000000
T: 28.770000; P: 99.523000; H: 19.240000; G: 12976914.000000
T: 28.910000; P: 99.525000; H: 19.092000; G: 12976914.000000
T: 29.010000; P: 99.527000; H: 18.940000; G: 12976914.000000
T: 29.140000; P: 99.527000; H: 18.816000; G: 12976914.000000
T: 29.230000; P: 99.527000; H: 18.691000; G: 12976914.000000
T: 29.330000; P: 99.528000; H: 18.565000; G: 12976914.000000
T: 29.420000; P: 99.530000; H: 18.450000; G: 12976914.000000
T: 29.490000; P: 99.528000; H: 18.327000; G: 12976914.000000
T: 29.590000; P: 99.525000; H: 18.239000; G: 12976914.000000
T: 29.670000; P: 99.527000; H: 18.137000; G: 12976914.000000
T: 29.700000; P: 99.528000; H: 18.053000; G: 12976914.000000
T: 29.710000; P: 99.528000; H: 17.963000; G: 12976914.000000
T: 29.770000; P: 99.525000; H: 17.891000; G: 12976914.000000
T: 29.800000; P: 99.527000; H: 17.838000; G: 12976914.000000
T: 29.830000; P: 99.527000; H: 17.804000; G: 12976914.000000
T: 29.850000; P: 99.528000; H: 17.742000; G: 12976914.000000
T: 29.890000; P: 99.528000; H: 17.708000; G: 12976914.000000
T: 29.950000; P: 99.528000; H: 17.650000; G: 12976914.000000
T: 30.030000; P: 99.528000; H: 17.601000; G: 12976914.000000
T: 30.150000; P: 99.527000; H: 17.557000; G: 12976914.000000
T: 30.270000; P: 99.525000; H: 17.503000; G: 12976914.000000
T: 30.320000; P: 99.527000; H: 17.446000; G: 12976914.000000
T: 30.390000; P: 99.525000; H: 17.365000; G: 12976914.000000
T: 30.430000; P: 99.527000; H: 17.312000; G: 12976914.000000
T: 30.500000; P: 99.528000; H: 17.256000; G: 12976914.000000
T: 30.520000; P: 99.528000; H: 17.197000; G: 12976914.000000
T: 30.570000; P: 99.525000; H: 17.158000; G: 12976914.000000
T: 30.640000; P: 99.527000; H: 17.098000; G: 12976914.000000
T: 30.630000; P: 99.527000; H: 17.038000; G: 12976914.000000
T: 30.660000; P: 99.528000; H: 17.025000; G: 12976914.000000
T: 30.640000; P: 99.527000; H: 16.963000; G: 12976914.000000
T: 30.660000; P: 99.527000; H: 16.925000; G: 12976914.000000
T: 30.630000; P: 99.527000; H: 16.888000; G: 12976914.000000
T: 30.630000; P: 99.527000; H: 16.878000; G: 12976914.000000
T: 30.660000; P: 99.528000; H: 16.865000; G: 12976914.000000
T: 30.720000; P: 99.527000; H: 16.859000; G: 12976914.000000
T: 30.750000; P: 99.527000; H: 16.810000; G: 12976914.000000
T: 30.810000; P: 99.527000; H: 16.793000; G: 12976914.000000
T: 30.870000; P: 99.523000; H: 16.763000; G: 12976914.000000
T: 30.950000; P: 99.523000; H: 16.745000; G: 12976914.000000
T: 31.000000; P: 99.523000; H: 16.704000; G: 12976914.000000
T: 31.020000; P: 99.523000; H: 16.670000; G: 12976914.000000
T: 31.030000; P: 99.527000; H: 16.625000; G: 12976914.000000
T: 31.100000; P: 99.525000; H: 16.584000; G: 12976914.000000
T: 31.150000; P: 99.525000; H: 16.548000; G: 12976914.000000
T: 31.190000; P: 99.527000; H: 16.525000; G: 12976914.000000
T: 31.190000; P: 99.527000; H: 16.470000; G: 12976914.000000
T: 31.200000; P: 99.525000; H: 16.457000; G: 12976914.000000
T: 31.230000; P: 99.527000; H: 16.422000; G: 12976914.000000
T: 31.180000; P: 99.523000; H: 16.400000; G: 12976914.000000
T: 31.220000; P: 99.523000; H: 16.376000; G: 12976914.000000
T: 31.280000; P: 99.525000; H: 16.355000; G: 12976914.000000
T: 31.320000; P: 99.527000; H: 16.348000; G: 12976914.000000
T: 31.370000; P: 99.523000; H: 16.310000; G: 12976914.000000
T: 31.390000; P: 99.525000; H: 16.296000; G: 12976914.000000
T: 31.380000; P: 99.521000; H: 16.251000; G: 12976914.000000
T: 31.360000; P: 99.523000; H: 16.231000; G: 12976914.000000
T: 31.410000; P: 99.525000; H: 16.228000; G: 12976914.000000
T: 31.440000; P: 99.525000; H: 16.204000; G: 12976914.000000
T: 31.470000; P: 99.527000; H: 16.187000; G: 12976914.000000
T: 31.490000; P: 99.525000; H: 16.173000; G: 12976914.000000
T: 31.490000; P: 99.527000; H: 16.138000; G: 12976914.000000
T: 31.510000; P: 99.523000; H: 16.114000; G: 12976914.000000
T: 31.530000; P: 99.523000; H: 16.094000; G: 12976914.000000
T: 31.520000; P: 99.521000; H: 16.110000; G: 12976914.000000
T: 31.510000; P: 99.525000; H: 16.105000; G: 12976914.000000
T: 31.560000; P: 99.525000; H: 16.102000; G: 12976914.000000
T: 31.560000; P: 99.523000; H: 16.092000; G: 12976914.000000
T: 31.570000; P: 99.527000; H: 16.092000; G: 12976914.000000
T: 31.600000; P: 99.525000; H: 16.085000; G: 12976914.000000
T: 31.640000; P: 99.527000; H: 16.066000; G: 12976914.000000
T: 31.670000; P: 99.528000; H: 16.049000; G: 12976914.000000
T: 31.650000; P: 99.528000; H: 16.048000; G: 12976914.000000
T: 31.640000; P: 99.528000; H: 16.047000; G: 12976914.000000
T: 31.680000; P: 99.532000; H: 16.039000; G: 12976914.000000
T: 31.730000; P: 99.528000; H: 16.015000; G: 12976914.000000
T: 31.750000; P: 99.530000; H: 16.002000; G: 12976914.000000
T: 31.780000; P: 99.528000; H: 15.969000; G: 12976914.000000
T: 31.830000; P: 99.528000; H: 15.957000; G: 12976914.000000
T: 31.830000; P: 99.527000; H: 15.947000; G: 12976914.000000
T: 31.820000; P: 99.527000; H: 15.917000; G: 12976914.000000
T: 31.850000; P: 99.525000; H: 15.927000; G: 12976914.000000
T: 31.800000; P: 99.525000; H: 15.986000; G: 12976914.000000
T: 31.800000; P: 99.525000; H: 16.001000; G: 12976914.000000
T: 31.830000; P: 99.527000; H: 15.972000; G: 12976914.000000
T: 31.860000; P: 99.528000; H: 15.943000; G: 12976914.000000
T: 31.890000; P: 99.527000; H: 15.915000; G: 12976914.000000
T: 31.890000; P: 99.525000; H: 15.860000; G: 12976914.000000
T: 31.970000; P: 99.525000; H: 15.825000; G: 12976914.000000
T: 32.050000; P: 99.527000; H: 15.790000; G: 12976914.000000
T: 32.120000; P: 99.527000; H: 15.774000; G: 12976914.000000
T: 32.180000; P: 99.528000; H: 15.712000; G: 12976914.000000
T: 32.170000; P: 99.525000; H: 15.666000; G: 12976914.000000
T: 32.210000; P: 99.527000; H: 15.639000; G: 12976914.000000
T: 32.210000; P: 99.527000; H: 15.589000; G: 12976914.000000
T: 32.180000; P: 99.527000; H: 15.568000; G: 12976914.000000
T: 32.150000; P: 99.525000; H: 15.553000; G: 12976914.000000
T: 32.190000; P: 99.525000; H: 15.553000; G: 12976914.000000
T: 32.290000; P: 99.528000; H: 15.564000; G: 12976914.000000
T: 32.350000; P: 99.528000; H: 15.527000; G: 12976914.000000
T: 32.400000; P: 99.527000; H: 15.496000; G: 12976914.000000
T: 32.380000; P: 99.528000; H: 15.450000; G: 12976914.000000
T: 32.400000; P: 99.528000; H: 15.422000; G: 12976914.000000
T: 32.370000; P: 99.527000; H: 15.405000; G: 12976914.000000
T: 32.440000; P: 99.525000; H: 15.413000; G: 12976914.000000
T: 32.410000; P: 99.523000; H: 15.392000; G: 12976914.000000
T: 32.420000; P: 99.528000; H: 15.357000; G: 12976914.000000
T: 32.480000; P: 99.528000; H: 15.376000; G: 12976914.000000
T: 32.540000; P: 99.528000; H: 15.368000; G: 12976914.000000
T: 32.590000; P: 99.525000; H: 15.346000; G: 12976914.000000
T: 32.670000; P: 99.528000; H: 15.285000; G: 12976914.000000

//Thingy:53 v1.0.0

T: 26.580000; P: 99.584000; H: 22.168000; G: 12946860.000000
T: 26.770000; P: 99.582000; H: 22.306000; G: 12946860.000000
T: 26.920000; P: 99.588000; H: 22.207000; G: 12946860.000000
T: 27.050000; P: 99.580000; H: 21.953000; G: 12946860.000000
T: 27.130000; P: 99.580000; H: 21.639000; G: 12946860.000000
T: 27.210000; P: 99.580000; H: 21.257000; G: 12946860.000000
T: 27.300000; P: 99.582000; H: 20.941000; G: 12946860.000000
T: 27.420000; P: 99.582000; H: 20.693000; G: 12946860.000000
T: 27.520000; P: 99.582000; H: 20.525000; G: 12946860.000000
T: 27.590000; P: 99.580000; H: 20.356000; G: 12946860.000000
T: 27.640000; P: 99.584000; H: 20.174000; G: 12946860.000000
T: 27.690000; P: 99.580000; H: 20.031000; G: 12946860.000000
T: 27.780000; P: 99.584000; H: 19.960000; G: 12946860.000000
T: 27.860000; P: 99.582000; H: 19.902000; G: 12946860.000000
T: 27.940000; P: 99.580000; H: 19.815000; G: 12946860.000000
T: 27.960000; P: 99.580000; H: 19.719000; G: 12946860.000000
T: 27.990000; P: 99.582000; H: 19.582000; G: 12946860.000000
T: 28.070000; P: 99.584000; H: 19.473000; G: 12946860.000000
T: 28.170000; P: 99.582000; H: 19.384000; G: 12946860.000000
T: 28.240000; P: 99.584000; H: 19.302000; G: 12946860.000000
T: 28.310000; P: 99.584000; H: 19.235000; G: 12946860.000000
T: 28.380000; P: 99.582000; H: 19.172000; G: 12946860.000000
T: 28.430000; P: 99.586000; H: 19.073000; G: 12946860.000000
T: 28.440000; P: 99.584000; H: 18.985000; G: 12946860.000000
T: 28.480000; P: 99.582000; H: 18.927000; G: 12946860.000000
T: 28.540000; P: 99.582000; H: 18.858000; G: 12946860.000000
T: 28.620000; P: 99.582000; H: 18.832000; G: 12946860.000000
T: 28.690000; P: 99.582000; H: 18.763000; G: 12946860.000000
T: 28.740000; P: 99.578000; H: 18.685000; G: 12946860.000000
T: 28.750000; P: 99.580000; H: 18.614000; G: 12946860.000000
T: 28.780000; P: 99.584000; H: 18.534000; G: 12946860.000000
T: 28.830000; P: 99.582000; H: 18.500000; G: 12946860.000000
T: 28.890000; P: 99.582000; H: 18.448000; G: 12946860.000000
T: 28.780000; P: 99.584000; H: 18.391000; G: 12946860.000000
T: 28.720000; P: 99.576000; H: 18.458000; G: 12946860.000000
T: 28.740000; P: 99.576000; H: 18.588000; G: 12946860.000000
T: 28.860000; P: 99.582000; H: 18.650000; G: 12946860.000000
T: 28.910000; P: 99.580000; H: 18.577000; G: 12946860.000000
T: 28.970000; P: 99.582000; H: 18.477000; G: 12946860.000000
T: 29.030000; P: 99.580000; H: 18.389000; G: 12946860.000000
T: 29.100000; P: 99.578000; H: 18.317000; G: 12946860.000000
T: 29.140000; P: 99.580000; H: 18.246000; G: 12946860.000000
T: 29.210000; P: 99.576000; H: 18.190000; G: 12946860.000000
T: 29.260000; P: 99.574000; H: 18.137000; G: 12946860.000000
T: 29.350000; P: 99.578000; H: 18.085000; G: 12946860.000000
T: 29.270000; P: 99.574000; H: 18.000000; G: 12946860.000000
T: 29.320000; P: 99.572000; H: 17.930000; G: 12946860.000000
T: 29.350000; P: 99.578000; H: 17.897000; G: 12946860.000000
T: 29.420000; P: 99.576000; H: 17.865000; G: 12946860.000000
T: 29.500000; P: 99.572000; H: 17.838000; G: 12946860.000000
T: 29.520000; P: 99.580000; H: 17.784000; G: 12946860.000000
T: 29.540000; P: 99.580000; H: 17.775000; G: 12946860.000000
T: 29.600000; P: 99.580000; H: 17.770000; G: 12946860.000000
T: 29.520000; P: 99.580000; H: 17.739000; G: 12946860.000000
T: 29.380000; P: 99.582000; H: 17.731000; G: 12946860.000000
T: 29.410000; P: 99.580000; H: 17.824000; G: 12946860.000000
T: 29.310000; P: 99.578000; H: 17.878000; G: 12946860.000000
T: 29.410000; P: 99.582000; H: 17.906000; G: 12946860.000000
T: 29.500000; P: 99.584000; H: 17.981000; G: 12946860.000000
T: 29.610000; P: 99.586000; H: 17.997000; G: 12946860.000000
T: 29.680000; P: 99.586000; H: 17.961000; G: 12946860.000000
T: 29.660000; P: 99.584000; H: 17.857000; G: 12946860.000000
T: 29.720000; P: 99.582000; H: 17.750000; G: 12946860.000000
T: 29.740000; P: 99.584000; H: 17.660000; G: 12946860.000000
T: 29.800000; P: 99.582000; H: 17.606000; G: 12946860.000000
T: 29.850000; P: 99.584000; H: 17.538000; G: 12946860.000000
T: 29.880000; P: 99.586000; H: 17.493000; G: 12946860.000000
T: 29.910000; P: 99.588000; H: 17.440000; G: 12946860.000000
T: 29.890000; P: 99.584000; H: 17.398000; G: 12946860.000000
T: 29.840000; P: 99.586000; H: 17.429000; G: 12946860.000000
T: 29.760000; P: 99.586000; H: 17.396000; G: 12946860.000000
T: 29.630000; P: 99.586000; H: 17.393000; G: 12946860.000000
T: 29.740000; P: 99.586000; H: 17.426000; G: 12946860.000000
T: 29.770000; P: 99.586000; H: 17.506000; G: 12946860.000000
T: 29.820000; P: 99.586000; H: 17.601000; G: 12946860.000000
T: 29.790000; P: 99.584000; H: 17.614000; G: 12946860.000000
T: 29.880000; P: 99.584000; H: 17.549000; G: 12946860.000000
T: 29.930000; P: 99.586000; H: 17.495000; G: 12946860.000000
T: 30.000000; P: 99.588000; H: 17.430000; G: 12946860.000000
T: 30.050000; P: 99.586000; H: 17.352000; G: 12946860.000000
T: 30.100000; P: 99.586000; H: 17.276000; G: 12946860.000000
T: 30.120000; P: 99.589000; H: 17.237000; G: 12946860.000000
T: 30.140000; P: 99.588000; H: 17.167000; G: 12946860.000000
T: 30.120000; P: 99.588000; H: 17.120000; G: 12946860.000000
T: 30.070000; P: 99.586000; H: 17.149000; G: 12946860.000000
T: 29.820000; P: 99.582000; H: 17.281000; G: 12946860.000000
T: 29.780000; P: 99.584000; H: 17.395000; G: 12946860.000000
T: 29.820000; P: 99.586000; H: 17.530000; G: 12946860.000000
T: 29.700000; P: 99.584000; H: 17.570000; G: 12946860.000000
T: 29.720000; P: 99.586000; H: 17.551000; G: 12946860.000000
T: 29.860000; P: 99.584000; H: 17.533000; G: 12946860.000000
T: 29.850000; P: 99.584000; H: 17.472000; G: 12946860.000000
T: 29.870000; P: 99.582000; H: 17.412000; G: 12946860.000000
T: 29.960000; P: 99.586000; H: 17.370000; G: 12946860.000000
T: 30.030000; P: 99.586000; H: 17.324000; G: 12946860.000000
T: 30.100000; P: 99.586000; H: 17.271000; G: 12946860.000000
T: 30.140000; P: 99.588000; H: 17.207000; G: 12946860.000000
T: 30.220000; P: 99.588000; H: 17.151000; G: 12946860.000000
T: 30.240000; P: 99.584000; H: 17.117000; G: 12946860.000000
T: 30.300000; P: 99.589000; H: 17.089000; G: 12946860.000000
T: 30.300000; P: 99.586000; H: 17.074000; G: 12946860.000000
T: 30.350000; P: 99.588000; H: 17.046000; G: 12946860.000000
T: 30.400000; P: 99.586000; H: 17.041000; G: 12946860.000000
T: 30.360000; P: 99.588000; H: 16.971000; G: 12946860.000000
T: 30.410000; P: 99.588000; H: 16.937000; G: 12946860.000000
T: 30.440000; P: 99.586000; H: 16.914000; G: 12946860.000000
T: 30.450000; P: 99.588000; H: 16.915000; G: 12946860.000000
T: 30.460000; P: 99.588000; H: 16.940000; G: 12946860.000000
T: 30.480000; P: 99.589000; H: 16.957000; G: 12946860.000000
T: 30.490000; P: 99.588000; H: 16.943000; G: 12946860.000000
T: 30.480000; P: 99.586000; H: 16.916000; G: 12946860.000000
T: 30.490000; P: 99.586000; H: 16.893000; G: 12946860.000000
T: 30.520000; P: 99.586000; H: 16.873000; G: 12946860.000000
T: 30.540000; P: 99.586000; H: 16.835000; G: 12946860.000000
T: 30.510000; P: 99.586000; H: 16.806000; G: 12946860.000000
T: 30.490000; P: 99.584000; H: 16.771000; G: 12946860.000000
T: 30.440000; P: 99.580000; H: 16.873000; G: 12946860.000000
T: 30.420000; P: 99.584000; H: 16.942000; G: 12946860.000000
T: 30.450000; P: 99.580000; H: 16.961000; G: 12946860.000000
T: 30.470000; P: 99.580000; H: 16.951000; G: 12946860.000000
T: 30.460000; P: 99.582000; H: 16.925000; G: 12946860.000000
T: 30.460000; P: 99.582000; H: 16.884000; G: 12946860.000000
T: 30.520000; P: 99.586000; H: 16.868000; G: 12946860.000000
T: 30.430000; P: 99.582000; H: 16.813000; G: 12946860.000000
T: 30.440000; P: 99.582000; H: 16.818000; G: 12946860.000000
T: 30.470000; P: 99.580000; H: 16.809000; G: 12946860.000000
T: 30.500000; P: 99.584000; H: 16.796000; G: 12946860.000000
T: 30.420000; P: 99.584000; H: 16.770000; G: 12946860.000000
T: 30.410000; P: 99.582000; H: 16.760000; G: 12946860.000000
T: 30.460000; P: 99.582000; H: 16.737000; G: 12946860.000000
T: 30.490000; P: 99.582000; H: 16.740000; G: 12946860.000000
T: 30.490000; P: 99.584000; H: 16.725000; G: 12946860.000000
T: 30.500000; P: 99.584000; H: 16.716000; G: 12946860.000000
T: 30.470000; P: 99.580000; H: 16.693000; G: 12946860.000000
T: 30.440000; P: 99.580000; H: 16.681000; G: 12946860.000000
T: 30.460000; P: 99.584000; H: 16.697000; G: 12946860.000000
T: 30.520000; P: 99.582000; H: 16.731000; G: 12946860.000000
T: 30.560000; P: 99.582000; H: 16.729000; G: 12946860.000000
T: 30.540000; P: 99.582000; H: 16.708000; G: 12946860.000000
T: 30.580000; P: 99.580000; H: 16.688000; G: 12946860.000000
T: 30.550000; P: 99.582000; H: 16.647000; G: 12946860.000000
T: 30.490000; P: 99.584000; H: 16.619000; G: 12946860.000000
T: 30.280000; P: 99.586000; H: 16.677000; G: 12946860.000000
T: 30.320000; P: 99.584000; H: 16.782000; G: 12946860.000000
T: 30.390000; P: 99.582000; H: 16.852000; G: 12946860.000000
T: 30.440000; P: 99.582000; H: 16.838000; G: 12946860.000000
T: 30.450000; P: 99.584000; H: 16.819000; G: 12946860.000000
T: 30.450000; P: 99.584000; H: 16.763000; G: 12946860.000000
T: 30.510000; P: 99.586000; H: 16.755000; G: 12946860.000000
T: 30.510000; P: 99.586000; H: 16.745000; G: 12946860.000000
T: 30.510000; P: 99.588000; H: 16.735000; G: 12946860.000000
T: 30.460000; P: 99.588000; H: 16.707000; G: 12946860.000000
T: 30.480000; P: 99.589000; H: 16.684000; G: 12946860.000000
T: 30.520000; P: 99.588000; H: 16.671000; G: 12946860.000000
T: 30.560000; P: 99.582000; H: 16.679000; G: 12946860.000000
T: 30.570000; P: 99.584000; H: 16.661000; G: 12946860.000000
T: 30.590000; P: 99.584000; H: 16.659000; G: 12946860.000000
T: 30.630000; P: 99.586000; H: 16.671000; G: 12946860.000000
T: 30.650000; P: 99.588000; H: 16.668000; G: 12946860.000000
T: 30.670000; P: 99.586000; H: 16.659000; G: 12946860.000000
T: 30.710000; P: 99.589000; H: 16.661000; G: 12946860.000000
T: 30.730000; P: 99.589000; H: 16.625000; G: 12946860.000000
T: 30.740000; P: 99.589000; H: 16.615000; G: 12946860.000000
T: 30.760000; P: 99.589000; H: 16.587000; G: 12946860.000000
T: 30.770000; P: 99.588000; H: 16.557000; G: 12946860.000000
T: 30.750000; P: 99.586000; H: 16.510000; G: 12946860.000000
T: 30.710000; P: 99.584000; H: 16.494000; G: 12946860.000000
T: 30.730000; P: 99.582000; H: 16.503000; G: 12946860.000000
T: 30.740000; P: 99.584000; H: 16.484000; G: 12946860.000000
T: 30.710000; P: 99.582000; H: 16.484000; G: 12946860.000000
T: 30.650000; P: 99.580000; H: 16.481000; G: 12946860.000000
T: 30.660000; P: 99.580000; H: 16.481000; G: 12946860.000000
T: 30.610000; P: 99.580000; H: 16.478000; G: 12946860.000000
T: 30.630000; P: 99.578000; H: 16.489000; G: 12946860.000000
T: 30.670000; P: 99.582000; H: 16.502000; G: 12946860.000000
T: 30.670000; P: 99.580000; H: 16.517000; G: 12946860.000000
T: 30.690000; P: 99.582000; H: 16.539000; G: 12946860.000000
T: 30.730000; P: 99.584000; H: 16.523000; G: 12946860.000000
T: 30.610000; P: 99.578000; H: 16.493000; G: 12946860.000000
T: 30.580000; P: 99.582000; H: 16.511000; G: 12946860.000000
T: 30.470000; P: 99.580000; H: 16.470000; G: 12946860.000000
T: 30.440000; P: 99.582000; H: 16.473000; G: 12946860.000000
T: 30.490000; P: 99.580000; H: 16.518000; G: 12946860.000000
T: 30.530000; P: 99.584000; H: 16.534000; G: 12946860.000000
T: 30.570000; P: 99.584000; H: 16.525000; G: 12946860.000000
T: 30.520000; P: 99.582000; H: 16.514000; G: 12946860.000000
T: 30.560000; P: 99.582000; H: 16.491000; G: 12946860.000000
T: 30.590000; P: 99.580000; H: 16.487000; G: 12946860.000000
T: 30.570000; P: 99.582000; H: 16.510000; G: 12946860.000000
T: 30.590000; P: 99.580000; H: 16.481000; G: 12946860.000000
T: 30.570000; P: 99.580000; H: 16.510000; G: 12946860.000000
T: 30.590000; P: 99.580000; H: 16.497000; G: 12946860.000000
T: 30.640000; P: 99.582000; H: 16.494000; G: 12946860.000000
T: 30.670000; P: 99.578000; H: 16.491000; G: 12946860.000000
T: 30.670000; P: 99.580000; H: 16.502000; G: 12946860.000000
T: 30.600000; P: 99.580000; H: 16.478000; G: 12946860.000000
T: 30.590000; P: 99.582000; H: 16.487000; G: 12946860.000000
T: 30.670000; P: 99.582000; H: 16.502000; G: 12946860.000000
T: 30.640000; P: 99.582000; H: 16.540000; G: 12946860.000000
T: 30.680000; P: 99.584000; H: 16.588000; G: 12946860.000000
T: 30.690000; P: 99.584000; H: 16.624000; G: 12946860.000000
T: 30.720000; P: 99.582000; H: 16.656000; G: 12946860.000000
T: 30.710000; P: 99.582000; H: 16.661000; G: 12946860.000000
T: 30.700000; P: 99.584000; H: 16.620000; G: 12946860.000000
T: 30.720000; P: 99.586000; H: 16.586000; G: 12946860.000000
T: 30.720000; P: 99.582000; H: 16.555000; G: 12946860.000000
T: 30.720000; P: 99.586000; H: 16.510000; G: 12946860.000000
T: 30.740000; P: 99.588000; H: 16.474000; G: 12946860.000000
T: 30.700000; P: 99.588000; H: 16.453000; G: 12946860.000000
T: 30.660000; P: 99.584000; H: 16.440000; G: 12946860.000000
T: 30.620000; P: 99.584000; H: 16.437000; G: 12946860.000000
T: 30.630000; P: 99.588000; H: 16.448000; G: 12946860.000000

RE: Gas resistance values from BME688 on Thingy:53

DougR — Tue, 11 Apr 2023 17:45:22 GMT

My setup, build, programming and test is as follows:

Wiring: Thingy:53 connected via JTAG cable to nRF5340-DK Debug Out, and devkit connected via USB at J2 to computer. Thingy53 switched on, then devkit switched on.

Software and build: in VSCode with nRF Connect plugin, Welcome>Create a new application, pick SDK 2.3.0, in Application Template pick zephyr/samples/sensor/bme680. Pick an application name. Then under Applications>bme680 (or whatever name), create build configuration with board thingy53_nrf5340_cpuapp_ns, otherwise default arguments, then Build Configuration.

Programming: In VSCode, Actions>Flash (erase and flash to board).

Testing: Power off and unplug devices. Plug Thingy53 USB-C direct to computer and power on. Find the appropriate COM port in nRF Terminal in VSCode. Note values being printed on screen. Note T and H values shift when exhaling into air slots on back of Thingy53. Note the G value does not. I'd expect some kind of deflection even from breath, but organic solvent vapors should really do something.

In my example here, the temperature changes from 25 to 30 C and the humidity from 31% to 81%.

From what I understand about these sensors, the BME688 is very similar but not quite identical hardware/interface wise to the 680. The 688 datasheet mentions a VARIANT_ID register which returns 0x01 on the 688, and Bosch's API does query this and do something with it. I didn't see anything similar in the Zephyr 680 driver, though clearly lots of things about the hardware and driver are working.

I'll check out Asset Tracker v2 example. I didn't know the BSEC stuff swapped out the driver as well, that's promising.

RE: Gas resistance values from BME688 on Thingy:53

Øyvind — Tue, 11 Apr 2023 16:16:19 GMT

Hello,

Can you provide more information on your setup? How did you try build the sample? I will try to reproduce on my side.

[quote user=""]Does the Zephyr driver need to be updated to deal with differences between the 680 and the 688?[/quote]

According to Adafruit Industries, the BME688 is a drop-in replacement of BME680.

Note that there is a pull request which adds missing DTS nodelabels found here: https://github.com/zephyrproject-rtos/zephyr/pull/55632

From what I understand you need to use the BSEC Software which is a library running on the device microcontroller to operate the BME688, to analyze the sensor data and to calculate all sensor outputs like ambient humidity, index for air quality or gas scan results. The BSEC software can be configured by config strings generated by the BME AI-Studio software. The BSEC library offers a complete, easy to integrate software fusion solution out of one hand and thus eliminates the need for own fusion software development. It can be downloaded below together with a comprehensive software implementation guide. See Bosch Sensortec BME688 software product page.

From our Asset Tracker v2, which uses the BME680, the documentation states:

The sensor module supports integration with the BSEC signal processing library using the external sensors, internal convenience API. If enabled, the BSEC library is used instead of the BME680 Zephyr driver to provide sensor readings from the BME680 for temperature, humidity, and atmospheric pressure. In addition, the BSEC driver provides an additional sensor reading, indoor air quality (IAQ), which is a metric given in between 0-500 range, which estimates the air quality of the environment.

As the BSEC library requires a separate license, it is not a default part of nRF Connect SDK, but can be downloaded externally and imported into the nRF Connect SDK source tree.

Kind regards,
Øyvind