pimoroni-pico/micropython/examples/breakout_bme68x

BME68X

• Getting Started
• Reading Data From The Sensor
• Configuring The Sensor
  • Filter Settings
  • Oversampling Settings
  • Mode Settings
  • Standby/Output Data Rate Settings
  • Defaults

Getting Started

Construct new I2C and BreakoutBME68X instances:

from breakout_bme68x import BreakoutBME68X

i2c = machine.I2C()
bme = BreakoutBME68X(i2c)

The default I2C address is 0x76. If you've cut the trace to change the I2C address of the sensor, you can specify the alternate I2C address like this:

bme = BreakoutBME68X(i2c, 0x77)

The breakout_bme68x module also includes constants for the possible I2C addresses:

• I2C_ADDRESS_DEFAULT
• I2C_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:

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:

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.

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

bme.configure(FILTER_COEFF_3, STANDBY_TIME_1000_MS, OVERSAMPLING_16X, OVERSAMPLING_2X, OVERSAMPLING_1X)