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This is a MicroPython library for the Raspberry Pi Pico and allows communicating with the BMP280 pressure sensor through the SPI and I2C protocols.

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flrrth/pico-bmp280

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This is a MicroPython library for the Raspberry Pi Pico and allows communicating with theBMP280 pressure sensorthrough the SPI and I2C protocols.

SPI Example

frommachineimportPin,SPIfromutimeimportsleepfrombmp280importBMP280SPIspi1_sck=Pin(10)spi1_tx=Pin(11)spi1_rx=Pin(12)spi1_csn=Pin(13,Pin.OUT,value=1)spi1=SPI(1,sck=spi1_sck,mosi=spi1_tx,miso=spi1_rx)bmp280_spi=BMP280SPI(spi1,spi1_csn)whileTrue:readout=bmp280_spi.measurementsprint(f"Temperature:{readout['t']} °C, pressure:{readout['p']} hPa.")sleep(1)

This is the circuit for the example code above. It uses theAdafruit BMP280breakout board.

Fritzing wiring for the SPI example code .

I2C Example

frommachineimportPin,I2Cfromutimeimportsleepfrombmp280importBMP280I2Ci2c0_sda=Pin(8)i2c0_scl=Pin(9)i2c0=I2C(0,sda=i2c0_sda,scl=i2c0_scl,freq=400000)bmp280_i2c=BMP280I2C(0x77,i2c0)# address may be differentwhileTrue:readout=bmp280_i2c.measurementsprint(f"Temperature:{readout['t']} °C, pressure:{readout['p']} hPa.")sleep(1)

Fritzing wiring for the I2C example code .

Customizing configuration

The default settings use theweather monitoring settings as specifiedby Bosch in thedatasheet(see table 15 on page 19). The configuration can be changed by overriding the defaults set inBMP280Configuration.

The next example configures the BMP280 forindoor navigation:

frombmp280importBMP280I2C,BMP280Configurationconfig=BMP280Configuration()config.power_mode=BMP280Configuration.POWER_MODE_NORMALconfig.pressure_oversampling=BMP280Configuration.PRESSURE_OVERSAMPLING_16Xconfig.temperature_oversampling=BMP280Configuration.TEMPERATURE_OVERSAMPLING_2Xconfig.filter_coefficient=BMP280Configuration.FILTER_COEFFICIENT_16config.standby_time=BMP280Configuration.STANDBY_TIME__5_MSbmp280_i2c=BMP280I2C(0x77,i2c0,config)

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This is a MicroPython library for the Raspberry Pi Pico and allows communicating with the BMP280 pressure sensor through the SPI and I2C protocols.

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