BMP280 Pressure Sensor

R2026b

Measure barometric air pressure and ambient temperature from BMP280 sensor

Since R2022b

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BMP280 Pressure Sensor block

To add a block to a model, double-click the canvas and start typing the block name. Then, select the block from the list.

Libraries:
C2000 Microcontroller Blockset / Sensors

Description

The BMP280 Pressure Sensor block measures barometric air pressure and ambient temperature using the BMP280 Pressure sensor interfaced with the C2000 board.

Ports

Output

Pressure — Barometric air pressure

scalar

The block outputs barometric air pressure in Pascal (Pa).

Dependencies

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

Data Types: double

Temperature — Ambient temperature

scalar

The block outputs the ambient temperature in ℃.

Dependencies

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

Data Types: double

Status — Status of values read for pressure and temperature

0 | 1

The block outputs the status of barometric air pressure and ambient temperature measurements. 0 indicates that the data read is new, 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 — Specific module used for I2C communication

I2C_A (default)

Specify the module on the board that you are using for I2C communication.

I2C address — I2C address to communicate with the BMP280 sensor

0x76 (default) | 0x77

The I2C addresses to communicate with the peripheral on the BMP280 sensor are decided by the state of the SDO pin on the hardware board. This table provides the I2C addresses corresponding to the pin and their state.

Pin Name	Pin State	I2C address
SDO	0	0x76
	1	0x77

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.

Status — Set output port for obtaining status of selected outputs

on (default) | off

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

Data type — Output data type for values from BMP280 sensor

single (default) | double | uint32

Select the data type of the sensor from which the block reads the values.

Specify the output data type for the values read from BMP280 sensor. The default data type for C2000 hardware is single. Use this parameter to change the values to double, or uint32 if required.

Sample time — Time interval to read data

-1 (default) | positive integer

Specify how often this block reads the data from the BMP280 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.

IIR filter settings

Filter coeffiecient — Filter coefficient value

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

Select the filter coefficient value of the sensor, which helps in reducing the bandwidth of output signals.

The default filter coefficient value for C2000 hardware is 0. Use this parameter to change the values, if required.

Sensitivity

Pressure sensitivity factor (Pa) — Pressure sensitivity factor

2.62 (default) | 1.31 | 0.66 | 0.33 | 0.16

Select the pressure sensitivity factor, which the sensor uses to read values during changing air pressure.

The default data type for C2000 hardware is 2.62. Use this parameter to change the values, if required.

When filter is enabled, the sensor uses this formula to get the latest measurement calculation.

dt = (dadc / f) + dt-1 (1 - 1 / f), where dt is the current data, dt-1 is the previous data, dadc is the prefiltered data, and f is the filter coefficient.

Temperature sensitivity factor (℃) — Temperature sensitivity factor

0.005 (default) | 0.0025

Select the temperature sensitivity factor, which the sensor uses to read values during changing temperature conditions.

The default data type for C2000 hardware is 0.005. Use this parameter to change the values, if required.

Programmatic Use: Add Block

To add the block programmatically, use the add_block function with one of these library block paths as the source.

"c2000sensorslib/BMP280"

Example: add_block("c2000sensorslib/BMP280","myModel/myBlock",MakeNameUnique="on")

Version History

Introduced in R2022b