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| # https://github.com/micropython-IMU/micropython-bmp180/blob/master/bmp180.py | ||
|
|
||
| ''' | ||
| bmp180 is a micropython module for the Bosch BMP180 sensor. It measures | ||
| temperature as well as pressure, with a high enough resolution to calculate | ||
| altitude. | ||
| Breakoutboard: http://www.adafruit.com/products/1603 | ||
| data-sheet: http://ae-bst.resource.bosch.com/media/products/dokumente/ | ||
| bmp180/BST-BMP180-DS000-09.pdf | ||
| The MIT License (MIT) | ||
| Copyright (c) 2014 Sebastian Plamauer, [email protected] | ||
| Permission is hereby granted, free of charge, to any person obtaining a copy | ||
| of this software and associated documentation files (the "Software"), to deal | ||
| in the Software without restriction, including without limitation the rights | ||
| to use, copy, modify, merge, publish, distribute, sublicense, and/or sell | ||
| copies of the Software, and to permit persons to whom the Software is | ||
| furnished to do so, subject to the following conditions: | ||
| The above copyright notice and this permission notice shall be included in | ||
| all copies or substantial portions of the Software. | ||
| THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR | ||
| IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, | ||
| FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE | ||
| AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER | ||
| LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, | ||
| OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN | ||
| THE SOFTWARE. | ||
| ''' | ||
|
|
||
| from ustruct import unpack as unp | ||
| from machine import I2C, Pin | ||
| import math | ||
| import time | ||
|
|
||
| # BMP180 class | ||
| class BMP180(): | ||
| ''' | ||
| Module for the BMP180 pressure sensor. | ||
| ''' | ||
|
|
||
| _bmp_addr = 119 # adress of BMP180 is hardcoded on the sensor | ||
|
|
||
| # init | ||
| def __init__(self, i2c_bus): | ||
|
|
||
| # create i2c obect | ||
| _bmp_addr = self._bmp_addr | ||
| self._bmp_i2c = i2c_bus | ||
| self._bmp_i2c.start() | ||
| self.chip_id = self._bmp_i2c.readfrom_mem(_bmp_addr, 0xD0, 2) | ||
| # read calibration data from EEPROM | ||
| self._AC1 = unp('>h', self._bmp_i2c.readfrom_mem(_bmp_addr, 0xAA, 2))[0] | ||
| self._AC2 = unp('>h', self._bmp_i2c.readfrom_mem(_bmp_addr, 0xAC, 2))[0] | ||
| self._AC3 = unp('>h', self._bmp_i2c.readfrom_mem(_bmp_addr, 0xAE, 2))[0] | ||
| self._AC4 = unp('>H', self._bmp_i2c.readfrom_mem(_bmp_addr, 0xB0, 2))[0] | ||
| self._AC5 = unp('>H', self._bmp_i2c.readfrom_mem(_bmp_addr, 0xB2, 2))[0] | ||
| self._AC6 = unp('>H', self._bmp_i2c.readfrom_mem(_bmp_addr, 0xB4, 2))[0] | ||
| self._B1 = unp('>h', self._bmp_i2c.readfrom_mem(_bmp_addr, 0xB6, 2))[0] | ||
| self._B2 = unp('>h', self._bmp_i2c.readfrom_mem(_bmp_addr, 0xB8, 2))[0] | ||
| self._MB = unp('>h', self._bmp_i2c.readfrom_mem(_bmp_addr, 0xBA, 2))[0] | ||
| self._MC = unp('>h', self._bmp_i2c.readfrom_mem(_bmp_addr, 0xBC, 2))[0] | ||
| self._MD = unp('>h', self._bmp_i2c.readfrom_mem(_bmp_addr, 0xBE, 2))[0] | ||
|
|
||
| # settings to be adjusted by user | ||
| self.oversample_setting = 3 | ||
| self.baseline = 101325.0 | ||
|
|
||
| # output raw | ||
| self.UT_raw = None | ||
| self.B5_raw = None | ||
| self.MSB_raw = None | ||
| self.LSB_raw = None | ||
| self.XLSB_raw = None | ||
| self.gauge = self.makegauge() # Generator instance | ||
| for _ in range(128): | ||
| next(self.gauge) | ||
| time.sleep_ms(1) | ||
|
|
||
| def compvaldump(self): | ||
| ''' | ||
| Returns a list of all compensation values | ||
| ''' | ||
| return [self._AC1, self._AC2, self._AC3, self._AC4, self._AC5, self._AC6, | ||
| self._B1, self._B2, self._MB, self._MC, self._MD, self.oversample_setting] | ||
|
|
||
| # gauge raw | ||
| def makegauge(self): | ||
| ''' | ||
| Generator refreshing the raw measurments. | ||
| ''' | ||
| delays = (5, 8, 14, 25) | ||
| while True: | ||
| self._bmp_i2c.writeto_mem(self._bmp_addr, 0xF4, bytearray([0x2E])) | ||
| t_start = time.ticks_ms() | ||
| while (time.ticks_ms() - t_start) <= 5: # 5mS delay | ||
| yield None | ||
| try: | ||
| self.UT_raw = self._bmp_i2c.readfrom_mem(self._bmp_addr, 0xF6, 2) | ||
| except: | ||
| yield None | ||
| self._bmp_i2c.writeto_mem(self._bmp_addr, 0xF4, bytearray([0x34+(self.oversample_setting << 6)])) | ||
| t_pressure_ready = delays[self.oversample_setting] | ||
| t_start = time.ticks_ms() | ||
| while (time.ticks_ms() - t_start) <= t_pressure_ready: | ||
| yield None | ||
| try: | ||
| self.MSB_raw = self._bmp_i2c.readfrom_mem(self._bmp_addr, 0xF6, 1) | ||
| self.LSB_raw = self._bmp_i2c.readfrom_mem(self._bmp_addr, 0xF7, 1) | ||
| self.XLSB_raw = self._bmp_i2c.readfrom_mem(self._bmp_addr, 0xF8, 1) | ||
| except: | ||
| yield None | ||
| yield True | ||
|
|
||
| def blocking_read(self): | ||
| if next(self.gauge) is not None: # Discard old data | ||
| pass | ||
| while next(self.gauge) is None: | ||
| pass | ||
|
|
||
| @property | ||
| def oversample_sett(self): | ||
| return self.oversample_setting | ||
|
|
||
| @oversample_sett.setter | ||
| def oversample_sett(self, value): | ||
| if value in range(4): | ||
| self.oversample_setting = value | ||
| else: | ||
| print('oversample_sett can only be 0, 1, 2 or 3, using 3 instead') | ||
| self.oversample_setting = 3 | ||
|
|
||
| @property | ||
| def temperature(self): | ||
| ''' | ||
| Temperature in degree C. | ||
| ''' | ||
| next(self.gauge) | ||
| try: | ||
| UT = unp('>H', self.UT_raw)[0] | ||
| except: | ||
| return 0.0 | ||
| X1 = (UT-self._AC6)*self._AC5/2**15 | ||
| X2 = self._MC*2**11/(X1+self._MD) | ||
| self.B5_raw = X1+X2 | ||
| return (((X1+X2)+8)/2**4)/10 | ||
|
|
||
| @property | ||
| def pressure(self): | ||
| ''' | ||
| Pressure in mbar. | ||
| ''' | ||
| next(self.gauge) | ||
| self.temperature # Populate self.B5_raw | ||
| try: | ||
| MSB = unp('B', self.MSB_raw)[0] | ||
| LSB = unp('B', self.LSB_raw)[0] | ||
| XLSB = unp('B', self.XLSB_raw)[0] | ||
| except: | ||
| return 0.0 | ||
| UP = ((MSB << 16)+(LSB << 8)+XLSB) >> (8-self.oversample_setting) | ||
| B6 = self.B5_raw-4000 | ||
| X1 = (self._B2*(B6**2/2**12))/2**11 | ||
| X2 = self._AC2*B6/2**11 | ||
| X3 = X1+X2 | ||
| B3 = ((int((self._AC1*4+X3)) << self.oversample_setting)+2)/4 | ||
| X1 = self._AC3*B6/2**13 | ||
| X2 = (self._B1*(B6**2/2**12))/2**16 | ||
| X3 = ((X1+X2)+2)/2**2 | ||
| B4 = abs(self._AC4)*(X3+32768)/2**15 | ||
| B7 = (abs(UP)-B3) * (50000 >> self.oversample_setting) | ||
| if B7 < 0x80000000: | ||
| pressure = (B7*2)/B4 | ||
| else: | ||
| pressure = (B7/B4)*2 | ||
| X1 = (pressure/2**8)**2 | ||
| X1 = (X1*3038)/2**16 | ||
| X2 = (-7357*pressure)/2**16 | ||
| return pressure+(X1+X2+3791)/2**4 | ||
|
|
||
| @property | ||
| def altitude(self): | ||
| ''' | ||
| Altitude in m. | ||
| ''' | ||
| try: | ||
| p = -7990.0*math.log(self.pressure/self.baseline) | ||
| except: | ||
| p = 0.0 | ||
| return p |
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