100 lines
2.6 KiB
Markdown
100 lines
2.6 KiB
Markdown
# BME68X <!-- omit in toc -->
|
|
|
|
- [Getting Started](#getting-started)
|
|
- [Reading Data From The Sensor](#reading-data-from-the-sensor)
|
|
- [Configuring The Sensor](#configuring-the-sensor)
|
|
- [Filter Settings](#filter-settings)
|
|
- [Oversampling Settings](#oversampling-settings)
|
|
- [Mode Settings](#mode-settings)
|
|
- [Standby/Output Data Rate Settings](#standbyoutput-data-rate-settings)
|
|
- [Defaults](#defaults)
|
|
|
|
## Getting Started
|
|
|
|
Construct new `PimoroniI2C` and `BreakoutBME68X` instances:
|
|
|
|
```python
|
|
from breakout_bme68x import BreakoutBME68X
|
|
from pimoroni_i2c import PimoroniI2C
|
|
|
|
PINS_BREAKOUT_GARDEN = {"sda": 4, "scl": 5}
|
|
PINS_PICO_EXPLORER = {"sda": 20, "scl": 21}
|
|
|
|
i2c = PimoroniI2C(**PINS_PICO_EXPLORER)
|
|
bme = BreakoutBME68X(i2c)
|
|
```
|
|
|
|
The `breakout_bme68x` module includes constants for the possible I2C addresses:
|
|
|
|
* `ADDRESS_DEFAULT`
|
|
* `ADDRESS_ALT`
|
|
|
|
## Reading Data From The Sensor
|
|
|
|
The `read` method will return a tuple containing Temperature (degrees C), Pressure (Pa), relative humidity (%rH), and gas resistance (Ω) values, plus the status code and gas/measurement indexes:
|
|
|
|
```python
|
|
temperature, pressure, humidity, gas_resistance, status, gas_index, meas_index = bme.read()
|
|
```
|
|
|
|
In all cases `gas_index` and `meas_index` will be zero, since these refer to the measurement profile used to gather the current readings. The MicroPython bindings currently only support a single measurement profile with a default of 300c for 100ms.
|
|
|
|
You can pass a custom temperature and duration into `read`:
|
|
|
|
```python
|
|
temperature, pressure, humidity, gas_resistance, status, gas_index, meas_index = bme.read(heater_temp=250, heater_duration=50)
|
|
```
|
|
|
|
## Configuring The Sensor
|
|
|
|
The `configure` method allows you to set up the oversampling, filtering and operation mode.
|
|
|
|
```python
|
|
bme.configure(filter, standby_time, os_pressure, os_temp, os_humidity)
|
|
```
|
|
|
|
The `breakout_bme68x` module includes constants for these:
|
|
|
|
### Filter Settings
|
|
|
|
* `FILTER_COEFF_OFF`
|
|
* `FILTER_COEFF_1`
|
|
* `FILTER_COEFF_3`
|
|
* `FILTER_COEFF_8`
|
|
* `FILTER_COEFF_15`
|
|
* `FILTER_COEFF_31`
|
|
* `FILTER_COEFF_63`
|
|
* `FILTER_COEFF_127`
|
|
|
|
### Oversampling Settings
|
|
|
|
* `NO_OVERSAMPLING`
|
|
* `OVERSAMPLING_1X`
|
|
* `OVERSAMPLING_2X`
|
|
* `OVERSAMPLING_4X`
|
|
* `OVERSAMPLING_8X`
|
|
* `OVERSAMPLING_16X`
|
|
|
|
### Mode Settings
|
|
|
|
* `SLEEP_MODE`
|
|
* `FORCED_MODE`
|
|
* `NORMAL_MODE`
|
|
|
|
### Standby/Output Data Rate Settings
|
|
|
|
* `STANDBY_TIME_0_59_MS`
|
|
* `STANDBY_TIME_62_5_MS`
|
|
* `STANDBY_TIME_125_MS`
|
|
* `STANDBY_TIME_250_MS`
|
|
* `STANDBY_TIME_500_MS`
|
|
* `STANDBY_TIME_1000_MS`
|
|
* `STANDBY_TIME_10_MS`
|
|
* `STANDBY_TIME_20_MS`
|
|
|
|
### Defaults
|
|
|
|
```python
|
|
bme.configure(FILTER_COEFF_3, STANDBY_TIME_1000_MS, OVERSAMPLING_16X, OVERSAMPLING_2X, OVERSAMPLING_1X)
|
|
```
|