BMP280 Pressure Sensor

Measure barometric air pressure and ambient temperature from BMP280 sensor

Since R2022b

• 

Libraries:
Raspberry Pi Blockset / Sensors / Environmental Sensors

Description

The BMP280 Pressure Sensor block measures barometric air pressure and ambient temperature using the BMP280 Pressure sensor interfaced with the Raspberry Pi^® board.

Note

To generate code C/C++ code for this block, you must have an Embedded Coder^® license.

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

General

I2C Module — Specific module used for I2C communication

1 (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 accelerometer 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

Data type — Output data type for values from BMP280 sensor

double (default) | single | uint32

Select the output data type of the sensor from which the block reads the values. The default data type for Raspberry Pi hardware is double. 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.

Select Outputs

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.

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 Raspberry Pi hardware is 0. 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.

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 Raspberry Pi hardware is 2.62. Use this parameter to change the values, if required.

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 Raspberry Pi hardware is 0.005. Use this parameter to change the values, if required.

Extended Capabilities

C/C++ Code Generation

Generate C and C++ code using Simulink® Coder™.

To generate code C/C++ code for this block, you must have an Embedded Coder license. For more information on selecting the right product stack according to your development goals, see Product Stack for Raspberry Pi Blockset.

Version History

Introduced in R2022b