BMP280 Pressure Sensor
Measure barometric air pressure and ambient temperature from BMP280 sensor
Since R2022b
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.
Version History
Introduced in R2022b
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