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Code Editor : bmp280.py
#coding: utf-8 import time ADDR=0x77 UNIT_PA = "Pa" UNIT_HPA = "hPa" # This value is necessary to calculate the correct height above sealevel # its also included in airport weather information ATIS named as QNH # The default is equivilent to the air pressure at mean sea level # in the International Standard Atmosphere (ISA). # See: https://en.wikipedia.org/wiki/Pressure_altitude QNH=1013.25 # hpA # power mode # POWER_MODE=0 # sleep mode # POWER_MODE=1 # forced mode # POWER_MODE=2 # forced mode POWER_MODE=3 # normal mode # temperature resolution # OSRS_T = 0 # skipped # OSRS_T = 1 # 16 Bit # OSRS_T = 2 # 17 Bit # OSRS_T = 3 # 18 Bit # OSRS_T = 4 # 19 Bit OSRS_T = 5 # 20 Bit # pressure resolution # OSRS_P = 0 # pressure measurement skipped # OSRS_P = 1 # 16 Bit ultra low power # OSRS_P = 2 # 17 Bit low power # OSRS_P = 3 # 18 Bit standard resolution # OSRS_P = 4 # 19 Bit high resolution OSRS_P = 5 # 20 Bit ultra high resolution # filter settings # FILTER = 0 # # FILTER = 1 # # FILTER = 2 # # FILTER = 3 # FILTER = 4 # # FILTER = 5 # # FILTER = 6 # # FILTER = 7 # # standby settings # T_SB = 0 # 000 0,5ms # T_SB = 1 # 001 62.5 ms # T_SB = 2 # 010 125 ms # T_SB = 3 # 011 250ms T_SB = 4 # 100 500ms # T_SB = 5 # 101 1000ms # T_SB = 6 # 110 2000ms # T_SB = 7 # 111 4000ms CONFIG = (T_SB <<5) + (FILTER <<2) # combine bits for config CTRL_MEAS = (OSRS_T <<5) + (OSRS_P <<2) + POWER_MODE # combine bits for ctrl_meas # print ("CONFIG:",CONFIG) # print ("CTRL_MEAS:",CTRL_MEAS) REGISTER_DIG_T1 = 0x88 REGISTER_DIG_T2 = 0x8A REGISTER_DIG_T3 = 0x8C REGISTER_DIG_P1 = 0x8E REGISTER_DIG_P2 = 0x90 REGISTER_DIG_P3 = 0x92 REGISTER_DIG_P4 = 0x94 REGISTER_DIG_P5 = 0x96 REGISTER_DIG_P6 = 0x98 REGISTER_DIG_P7 = 0x9A REGISTER_DIG_P8 = 0x9C REGISTER_DIG_P9 = 0x9E REGISTER_CHIPID = 0xD0 REGISTER_VERSION = 0xD1 REGISTER_SOFTRESET = 0xE0 REGISTER_CONTROL = 0xF4 REGISTER_CONFIG = 0xF5 REGISTER_STATUS = 0xF3 REGISTER_TEMPDATA_MSB = 0xFA REGISTER_TEMPDATA_LSB = 0xFB REGISTER_TEMPDATA_XLSB = 0xFC REGISTER_PRESSDATA_MSB = 0xF7 REGISTER_PRESSDATA_LSB = 0xF8 REGISTER_PRESSDATA_XLSB = 0xF9 class signed_int(int): def __new__(self, number, bits=16): if number & ( 1 << ( bits - 1 ) ): number -= 1 << bits return int.__new__(self, number) class bmp280(object): def __init__(self, i2c_bus=None, addr=ADDR): object.__init__(self) self._temperature = 0 self._pressure = 0 self.addr = addr self.i2c_bus = i2c_bus self._is_setup = False if getattr(i2c_bus, "write_byte_data", None) is None or getattr(i2c_bus, "read_byte_data", None) is None: raise TypeError("Object given for i2c_bus must implement write_byte_data and read_byte_data methods") def _write_byte(self, register, value): self.i2c_bus.write_byte_data(self.addr, register, value) def _read_byte(self, register): return self.i2c_bus.read_byte_data(self.addr, register) def _read_word(self, register): return self.i2c_bus.read_word_data(self.addr, register) def _read_signed_word(self, register): word = self._read_word(register) return signed_int(word) def _read_unsigned_word(self, register): return self._read_word(register) def temperature(self): """Return the current temperature. Note: This value may be affected by nearby sources of heat, including the Pi itself. """ self.update() return self._temperature def pressure(self, unit=None): """Return the current air pressure. :param unit: String denoting unit scale to return. Value values: 'Pa' and 'hPa' """ if unit is None: unit = "Pa" self.update() if unit.lower() == "hpa": return self._pressure / 100.0 else: return self._pressure def altitude(self, qnh=QNH): """Return the current approximate altitude. :param qnh: Your local value for atmospheric pressure adjusted to sea level. """ return 44330.0 * (1.0 - pow(self.pressure() / (qnh*100), (1.0/5.255))) # Calculate altitute from pressure & qnh def update(self): """Update stored temperature and pressure values. This function is called automatically when calling temperature() or pressure(). """ if not self._is_setup: if self._read_byte(REGISTER_CHIPID) == 0x58: # check sensor id 0x58=BMP280 self._write_byte(REGISTER_SOFTRESET,0xB6) # reset sensor time.sleep(0.2) # little break self._write_byte(REGISTER_CONTROL,CTRL_MEAS) # time.sleep(0.2) # little break self._write_byte(REGISTER_CONFIG,CONFIG) # time.sleep(0.2) self.dig_T1 = self._read_unsigned_word(REGISTER_DIG_T1) # read correction settings self.dig_T2 = self._read_signed_word(REGISTER_DIG_T2) self.dig_T3 = self._read_signed_word(REGISTER_DIG_T3) self.dig_P1 = self._read_unsigned_word(REGISTER_DIG_P1) self.dig_P2 = self._read_signed_word(REGISTER_DIG_P2) self.dig_P3 = self._read_signed_word(REGISTER_DIG_P3) self.dig_P4 = self._read_signed_word(REGISTER_DIG_P4) self.dig_P5 = self._read_signed_word(REGISTER_DIG_P5) self.dig_P6 = self._read_signed_word(REGISTER_DIG_P6) self.dig_P7 = self._read_signed_word(REGISTER_DIG_P7) self.dig_P8 = self._read_signed_word(REGISTER_DIG_P8) self.dig_P9 = self._read_signed_word(REGISTER_DIG_P9) else: raise IOError("bmp280 not found on address {:x}".format(self.addr)) self._is_setup = True raw_temp_msb=self._read_byte(REGISTER_TEMPDATA_MSB) # read raw temperature msb raw_temp_lsb=self._read_byte(REGISTER_TEMPDATA_LSB) # read raw temperature lsb raw_temp_xlsb=self._read_byte(REGISTER_TEMPDATA_XLSB) # read raw temperature xlsb raw_press_msb=self._read_byte(REGISTER_PRESSDATA_MSB) # read raw pressure msb raw_press_lsb=self._read_byte(REGISTER_PRESSDATA_LSB) # read raw pressure lsb raw_press_xlsb=self._read_byte(REGISTER_PRESSDATA_XLSB) # read raw pressure xlsb raw_temp=(raw_temp_msb <<12)+(raw_temp_lsb<<4)+(raw_temp_xlsb>>4) # combine 3 bytes msb 12 bits left, lsb 4 bits left, xlsb 4 bits right raw_press=(raw_press_msb <<12)+(raw_press_lsb <<4)+(raw_press_xlsb >>4) # combine 3 bytes msb 12 bits left, lsb 4 bits left, xlsb 4 bits right var1=(raw_temp/16384.0-self.dig_T1/1024.0)*self.dig_T2 # formula for temperature from datasheet var2=(raw_temp/131072.0-self.dig_T1/8192.0)*(raw_temp/131072.0-self.dig_T1/8192.0)*self.dig_T3 # formula for temperature from datasheet temp=(var1+var2)/5120.0 # formula for temperature from datasheet t_fine=(var1+var2) # need for pressure calculation var1=t_fine/2.0-64000.0 # formula for pressure from datasheet var2=var1*var1*self.dig_P6/32768.0 # formula for pressure from datasheet var2=var2+var1*self.dig_P5*2 # formula for pressure from datasheet var2=var2/4.0+self.dig_P4*65536.0 # formula for pressure from datasheet var1=(self.dig_P3*var1*var1/524288.0+self.dig_P2*var1)/524288.0 # formula for pressure from datasheet var1=(1.0+var1/32768.0)*self.dig_P1 # formula for pressure from datasheet press=1048576.0-raw_press # formula for pressure from datasheet press=(press-var2/4096.0)*6250.0/var1 # formula for pressure from datasheet var1=self.dig_P9*press*press/2147483648.0 # formula for pressure from datasheet var2=press*self.dig_P8/32768.0 # formula for pressure from datasheet press=press+(var1+var2+self.dig_P7)/16.0 # formula for pressure from datasheet self._temperature = temp self._pressure = press
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