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esp-open-rtos/examples/bme680/README.md
Gunar Schorcht 382022f507 Driver for Bosch Sensortec BME680 added 
BME680 is an ulta-low-power environmental sensor that integrates
temperature, pressure, humidity and gas sensors in only one unit.
2017-10-16 18:58:14 +02:00

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BME680 Driver Examples

These examples references two addtional drivers i2c and bme680, which are provided in the ../../extras folder.

If you plan to use one or both of this drivers in your own projects, please check the main development pages for updated versions or reported issues.

Hardware setup

There are examples that are using either I2C or SPI with one or two sensors.

For examples using BME680 sensor as I2C slave, just use GPIO5 (SCL) and GPIO4 (SDA) to connect to the BME680 sensor's I2C interface.

 +-------------------------+     +--------+
 | ESP8266  Bus 0          |     | BME680 |
 |          GPIO 5 (SCL)   +---->+ SCL    |
 |          GPIO 4 (SDA)   +-----+ SDA    |
 |                         |     +--------+
 +-------------------------+

For examples that are using SPI, BME680 sensor has to be connected to SPI bus 1. Since GPIO15 used as default CS signal of SPI bus 1 does not work correctly together with BME680, you have to connect CS to another GPIO pin, e.g., GPIO2.

+-------------------------+ +----------+ | ESP8266 Bus 1 | | BME680 | | GPIO 12 (MISO) <-----< SDO | | GPIO 13 (MOSI) >-----> SDI | | GPIO 14 (SCK) >-----> SCK | | GPIO 2 (CS) >-----> CS | +-------------------------+ +----------+

The example with two sensors use the combination of I2C and SPI.

Example description

bme680_one_sensor

In this simple example, only one sensor connected either to I2C or to SPI is used. Constant SPI_USED defines which interface is used.

bme680_two_sensors

Simple example with two sensors, one sensor connected to I2C bus 0 and one sensor connected to SPI. It defines two different user tasks that use the sensors as well as different approaches for the implementation of waiting for measurement results, one as busy waiting using bme680_is_measuring and one as passive waiting using vTaskDelay.