BME280

Measure barometric air pressure, relative humidity, and temperature from BME280 sensor

Since R2021b

• 

Libraries:
C2000 Microcontroller Blockset / Sensors

Description

The BME280 block outputs the values of barometric air pressure and relative humidity as measured by the BME280 sensor connected to C2000 board. The block also outputs the temperature as read by the BME280 sensor.

Examples

Read Data from IMU and Environmental Sensors

Use C2000™ Microcontroller Blockset to read data from the BMI160 Inertial Measurement Unit (IMU) sensor and BME280 Environmental sensor that are part of the BOOSTXL-SENSORS BoosterPack™ plug-in module.

• Open Model

Ports

Output

Pressure — Barometric air pressure measured by BME280 sensor

scalar

Barometric air pressure (in Pascal (Pa)) measured by a BME280 sensor that is connected to C2000 board.

Dependencies

This output port appears only if you select the Pressure (Pa) parameter.

Data Types: double

Temperature — Temperature measured by BME280 sensor

scalar

Temperature (in ℃) measured by BME280 sensor connected to C2000 board.

Dependencies

This output port appears only if you select the Temperature (℃) parameter.

Data Types: double

Humidity — Relative humidity measured by BME280 sensor

scalar

Relative humidity (in %) measured by BME280 sensor connected to C2000 board.

Dependencies

This output port appears only if you select the Humidity (%) parameter.

Data Types: double

Status — Status of read values

0 | 1

Status of read values from the BME280 sensor, to indicate if the data read is the new value or not. The Status value of 0 indicates that the data read is new and 1 indicates that the data read is not new.

Dependencies

This output port appears only if you select the Status parameter.

Data Types: uint8

Parameters

I2C module — Module for communication

I2C_A (default)

The I2C module to be used for communication to the BME280 sensor. The number of I2C modules supported varies across different C2000 processors. You can find the supported I2C modules corresponding to the processor (which you selected for the Hardware Board parameter in the Simulink model) by opening the Configuration Parameters dialog box and checking the I2C specific tabs under Target hardware resources.

I2C address — I2C address of BME280 sensor

0x77 (default) | 0x76

The I2C address used by BME280 sensor communicating with the C2000 processor. The default parameter value (0x77) corresponds to the value mentioned in the Schematics section of the BOOSTXL-SENSORS BoosterPack^TM Plug-in Module User's Guide.

Pressure (Pa) — Set output port for reading pressure

on (default) | off

Select this parameter to set Pressure as one of the output ports.

Temperature (℃) — Set output port for reading temperature

on (default) | off

Select this parameter to set Temperature as one of the output ports.

Humidity (%) — Set output port for reading humidity

on (default) | off

Select this parameter to set Humidity as one of the output ports.

Status — Set output port for obtaining status of values read

off (default) | on

Select this parameter to set Status as one of the output ports.

Filter coefficient — Filter coefficient for IIR filter

0 (default) | 2 | 4 | 8 | 16

Specify filter coefficient for the IIR filter while reading pressure and temperature values from BME280 sensor. Selecting a non-zero value for filter coefficient helps to improve the step response and remove short-term fluctuations in the measured values.

Stand by time — Standby time to read values

0.5 (default) | 10 | 20 | 62.5 | 125 | 250 | 500 | 1000

Specify the standby time (in ms) when the processor stays idle (inactive duration) while reading values from BME280 sensor. The selection of this value affects the total cycle time.

Pressure oversampling factor — Oversampling factor for the measured pressure value

1 (default) | 2 | 4 | 8 | 16

Specify the oversampling factor to reduce the noise for the pressure value read from BME280 sensor. This value is a multiplication factor that affects measurement rate and current consumption.

Humidity oversampling factor — Oversampling factor for the measured humidity value

1 (default) | 2 | 4 | 8 | 16

Specify the oversampling factor to reduce the noise for the humidity value read from BME280 sensor. This value is a multiplication factor that affects measurement rate and current consumption.

Temperature oversampling factor — Oversampling factor for the measured humidity value

1 (default) | 2 | 4 | 8 | 16

Specify the oversampling factor to reduce the noise for the temperature value read from BME280 sensor. This value is a multiplication factor that affects measurement rate and current consumption.

Data type — Output data type for values from BME280 sensor

single (default) | double

Specify the output data type for the values read from BME280 sensor. The default data type for TI’s C2000™ processors is single. Use this parameter to change the values to double, if required.

Sample time — Time interval to read data

-1 (default) | positive integer

Specify how often this block reads the data from the BME280 sensor. When you set this parameter to -1, Simulink determines the best sample time for the block based on the block context within the model.

Version History

Introduced in R2021b