How to convert the gas resistance of bme680 sensor to IAQ in thingy53

[Sachin Rawat]

Hi 
I am working on thingy53, Using Hello world application    NCS- 1.9.1

So I have enable the bme680 sensor of thingy53

I received the values for temp, pressure, humidity, gas resistance. ------How to change this gas resistance to IAQ value in thingy53-----  

This is my main.c 

/*
 * Copyright (c) 2012-2014 Wind River Systems, Inc.
 *
 * SPDX-License-Identifier: Apache-2.0
 */

#include <zephyr.h>
#include <drivers/sensor.h>

void main(void)
{
	
	const struct device *bme = DEVICE_DT_GET_ONE(bosch_bme680);
	struct sensor_value temp, press, humidity, gas_res;


	if (!device_is_ready(bme)) {
		printk("sensor: device not ready.\n");
		return;
	}
	printk("Device %p name is %s\n", bme, bme->name);

	while (1) {
		k_sleep(K_MSEC(3000));

		sensor_sample_fetch(bme);
		sensor_channel_get(bme, SENSOR_CHAN_AMBIENT_TEMP, &temp);
		sensor_channel_get(bme, SENSOR_CHAN_PRESS, &press);
		sensor_channel_get(bme, SENSOR_CHAN_HUMIDITY, &humidity);
		sensor_channel_get(bme, SENSOR_CHAN_GAS_RES, &gas_res);

		printk("T: %d.%06d | P: %d.%06d | H: %d.%06d | G: %d.%06d\n",
				temp.val1, temp.val2, press.val1, press.val2,
				humidity.val1, humidity.val2, gas_res.val1,
				gas_res.val2);
	}
}

And this is the output on RTT monitor

I have gone through many tickets but didn't find a solution.

Please help

[Vidar Berg]

Hi,

It looks like you need to integrate the BSEC library (https://github.com/BoschSensortec/Bosch-BSEC2-Library) to be able to map the measurements to an IAQ index. I did not find any instructions on how to do this without the library, at least.

Best regards,

Vidar

[Sachin Rawat]

Thanks for the response

Vidar Berg said:

It looks like you need to integrate the BSEC library (https://github.com/BoschSensortec/Bosch-BSEC2-Library) to be able to map the measurements to an IAQ index.

Okay, but how?

[Vidar Berg]

We don't have an examples that integrates this library, so this is something you have to do yourself, unfortunately. Bosch provides examples to demonstrate how you can do this though.

[Sachin Rawat]

Hi

This ticket  Using BSEC 2 library for bme688 with Thingy53  has been answered but I am not able to understand the steps that rtlab is using to resolve it, Could you help me in understanding the steps and resolve it? 

[Vidar Berg]

What above Hieu's reply above the suggested answer, are you able to follow those instructions? If not, please let me know how far you got and what step you got stuck on.