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| README.md | ||
BME680 Driver Examples
These examples demonstrate the usage of the BME680 driver with only one and multiple BME680 sensors.
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
This simple example uses only one sensor connected either to I2C or to SPI. Which of these interfaces is used is defined by constant SPI_USED. The user task triggers a measurement every second and uses function vTaskDelay to wait for the measurement results.
bme680_two_sensors
This example uses two sensors. One sensor is connected to I2C bus 0 and one sensor is connected to SPI. It defines two different user tasks, one for each sensor. It demonstrate the possible approaches to wait for measurement results, active busy waiting using bme680_is_measuring and passive waiting using vTaskDelay.
bme680_heating_profiles
This simple example uses one only sensor connected to I2C bus 0 and a sequence of heating profiles. The heating profile is changed with each cycle.