Simple test

Ensure your device works with this simple test.

examples/bmp280_simpletest.py

# SPDX-FileCopyrightText: 2021 ladyada for Adafruit Industries
# SPDX-License-Identifier: MIT

"""Simpletest Example that shows how to get temperature,
pressure, and altitude readings from a BMP280"""

import time

import board

# import digitalio # For use with SPI
import adafruit_bmp280

# Create sensor object, communicating over the board's default I2C bus
i2c = board.I2C()  # uses board.SCL and board.SDA
# i2c = board.STEMMA_I2C()  # For using the built-in STEMMA QT connector on a microcontroller
bmp280 = adafruit_bmp280.Adafruit_BMP280_I2C(i2c)

# OR Create sensor object, communicating over the board's default SPI bus
# spi = board.SPI()
# bmp_cs = digitalio.DigitalInOut(board.D5)
# bmp280 = adafruit_bmp280.Adafruit_BMP280_SPI(spi, bmp_cs)

# change this to match the location's pressure (hPa) at sea level
bmp280.sea_level_pressure = 1013.25

while True:
    print(f"\nTemperature: {bmp280.temperature:0.1f} C")
    print(f"Pressure: {bmp280.pressure:0.1f} hPa")
    print(f"Altitude = {bmp280.altitude:0.2f} meters")
    time.sleep(2)

Normal Mode

Example showing how the BMP280 library can be used to set the various parameters supported by the sensor.

examples/bmp280_normal_mode.py

# SPDX-FileCopyrightText: 2021 ladyada for Adafruit Industries
# SPDX-License-Identifier: MIT

"""
Example showing how the BMP280 library can be used to set the various
parameters supported by the sensor.
Refer to the BMP280 datasheet to understand what these parameters do
"""

import time

import board

import adafruit_bmp280

# Create sensor object, communicating over the board's default I2C bus
i2c = board.I2C()  # uses board.SCL and board.SDA
# i2c = board.STEMMA_I2C()  # For using the built-in STEMMA QT connector on a microcontroller
bmp280 = adafruit_bmp280.Adafruit_BMP280_I2C(i2c)

# OR Create sensor object, communicating over the board's default SPI bus
# spi = busio.SPI()
# bmp_cs = digitalio.DigitalInOut(board.D5)
# bmp280 = adafruit_bmp280.Adafruit_BMP280_SPI(spi, bmp_cs)

# change this to match the location's pressure (hPa) at sea level
bmp280.sea_level_pressure = 1013.25
bmp280.mode = adafruit_bmp280.MODE_NORMAL
bmp280.standby_period = adafruit_bmp280.STANDBY_TC_500
bmp280.iir_filter = adafruit_bmp280.IIR_FILTER_X16
bmp280.overscan_pressure = adafruit_bmp280.OVERSCAN_X16
bmp280.overscan_temperature = adafruit_bmp280.OVERSCAN_X2
# The sensor will need a moment to gather inital readings
time.sleep(1)

while True:
    print(f"\nTemperature: {bmp280.temperature:0.1f} C")
    print(f"Pressure: {bmp280.pressure:0.1f} hPa")
    print(f"Altitude = {bmp280.altitude:0.2f} meters")
    time.sleep(2)

DisplayIO Simpletest

This is a simple test for boards with built-in display.

examples/bmp280_displayio_simpletest.py

# SPDX-FileCopyrightText: 2024 Tim Cocks for Adafruit Industries
# SPDX-FileCopyrightText: 2024 Jose D. Montoya
#
# SPDX-License-Identifier: MIT

import time

import board
from adafruit_display_text.bitmap_label import Label
from displayio import Group
from terminalio import FONT

import adafruit_bmp280

# Simple demo of the BMP280 barometric pressure sensor.
# create a main_group to hold anything we want to show on the display.
main_group = Group()
# Initialize I2C bus and sensor.
i2c = board.I2C()  # uses board.SCL and board.SDA
bmp280 = adafruit_bmp280.Adafruit_BMP280_I2C(i2c)

# change this to match the location's pressure (hPa) at sea level
bmp280.sea_level_pressure = 1013.25

# Create two Labels to show the readings. If you have a very small
# display you may need to change to scale=1.
tempandpress_output_label = Label(FONT, text="", scale=2)
altitude_output_label = Label(FONT, text="", scale=2)

# place the labels in the middle of the screen with anchored positioning
tempandpress_output_label.anchor_point = (0, 0)
tempandpress_output_label.anchored_position = (
    4,
    board.DISPLAY.height // 2 - 40,
)
altitude_output_label.anchor_point = (0, 0)
altitude_output_label.anchored_position = (4, board.DISPLAY.height // 2 + 20)


# add the label to the main_group
main_group.append(tempandpress_output_label)
main_group.append(altitude_output_label)

# set the main_group as the root_group of the built-in DISPLAY
board.DISPLAY.root_group = main_group

# begin main loop
while True:
    # Update the label.text property to change the text on the display
    tempandpress_output_label.text = (
        f"Temperature:{bmp280.temperature:0.1f} C \nPressure:{bmp280.pressure:0.1f} hPa"
    )
    altitude_output_label.text = f"Altitude:{bmp280.altitude:0.2f} mts"
    # wait for a bit
    time.sleep(2.0)