树莓派3b+指南（二十一）bmp180

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最新推荐文章于 2025-07-24 12:01:47 发布 · 913 阅读

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#树莓派3b+指南（二十一）bmp180

本文介绍了如何在树莓派3b+上使用BMP180传感器进行温度和气压测量。通过示例代码bmp180.py和demo.py，详细阐述了传感器的连接与数据读取过程。

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bmp180.py

import time
import smbus
# BMP085 default address.
BMP180_I2CADDR = 0x77
# Operating Modes
BMP180_ULTRALOWPOWER = 0
BMP180_STANDARD = 1
BMP180_HIGHRES = 2
BMP180_ULTRAHIGHRES = 3
# BMP085 Registers
BMP180_CAL_AC1 = 0xAA  # R   Calibration data (16 bits)
BMP180_CAL_AC2 = 0xAC  # R   Calibration data (16 bits)
BMP180_CAL_AC3 = 0xAE  # R   Calibration data (16 bits)
BMP180_CAL_AC4 = 0xB0  # R   Calibration data (16 bits)
BMP180_CAL_AC5 = 0xB2  # R   Calibration data (16 bits)
BMP180_CAL_AC6 = 0xB4  # R   Calibration data (16 bits)
BMP180_CAL_B1 = 0xB6  # R   Calibration data (16 bits)
BMP180_CAL_B2 = 0xB8  # R   Calibration data (16 bits)
BMP180_CAL_MB = 0xBA  # R   Calibration data (16 bits)
BMP180_CAL_MC = 0xBC  # R   Calibration data (16 bits)
BMP180_CAL_MD = 0xBE  # R   Calibration data (16 bits)
BMP180_CONTROL = 0xF4
BMP180_TEMPDATA = 0xF6
BMP180_PRESSUREDATA = 0xF6
# Commands
BMP180_READTEMPCMD = 0x2E
BMP180_READPRESSURECMD = 0x34
class BMP180(object):
    def __init__(self, address=BMP180_I2CADDR, mode=BMP180_STANDARD):
        self._mode = mode
        self._address = address
        self._bus = smbus.SMBus(1)
        # Load calibration values.
        self._load_calibration()
        self.base_pressure = self.read_pressure() 
        self.base_pressure = self.read_pressure() 
        self.base_pressure = self.read_pressure()