threaded cyclic data aquisition implemented
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45
__init__.py
45
__init__.py
@ -1,44 +1,5 @@
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try:
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from config import dht_gpio
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except ImportError:
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dht_gpio = None
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try:
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import Adafruit_DHT as dht
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except ImportError:
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dht = None
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try:
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import Adafruit_BMP.BMP085 as bmp
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except ImportError:
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bmp = None
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#TODO: background process for value sensing (every x seconds)
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KEY_TEMPERATURE = 't'
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KEY_HUMIDITY = 'h'
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KEY_PRESSURE = 'p'
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import logging
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class EnvSens(object):
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def __init__(self):
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if bmp is not None:
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self.bmp = bmp.BMP085()
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def get_env_data(self):
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#
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# DHT22
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#
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if dht is None or dht_gpio is None:
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h = -17.3
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t = -125.7
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else:
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h, t = dht.read_retry(dht.DHT22, dht_gpio)
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#
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# BMP180
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#
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if bmp is None:
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p = -1024.17
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else:
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p = self.bmp.read_pressure()/100.
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return {KEY_TEMPERATURE: t, KEY_HUMIDITY: h, KEY_PRESSURE: p}
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logger_name = 'RPI_ENVSENS'
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logger = logging.getLogger(logger_name)
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141
bmp.py
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141
bmp.py
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# Distributed with a free-will license.
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# Use it any way you want, profit or free, provided it fits in the licenses of its associated works.
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# BMP180
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# This code is designed to work with the BMP180_I2CS I2C Mini Module available from ControlEverything.com.
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# https://www.controleverything.com/content/Pressure?sku=BMP180_I2CS#tabs-0-product_tabset-2
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import smbus
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import threading
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import time
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from . import logger
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class bmp_180(object):
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KEY_TEMPERATURE = 'temperature'
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KEY_PRESSURE = 'pressure'
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KEY_TIME = 'time'
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def __init__(self, data_callback=None):
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self.__data_callback__ = data_callback
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# Initial the dht device, with data pin connected to:
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self.__active__ = True
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self.__thread__ = threading.Thread(target=self.run, args=())
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self.__thread__.daemon = True # Daemonize thread
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self.__thread__.start() # Start the execution
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def run(self):
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while self.__active__:
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data = self.__bmp_data_transmission__()
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if data is not None:
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logger.debug('BMP-Communication: Successfully: %s', repr(data))
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if self.__data_callback__ is not None:
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self.__data_callback__(**data)
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time.sleep(0.5)
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def close(self):
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self.__active__ = False
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self.__thread__.join()
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def __del__(self):
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self.close()
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def __bmp_data_transmission__(self):
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rv = {}
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# Get I2C bus
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bus = smbus.SMBus(1)
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# BMP180 address, 0x77(119)
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# Read data back from 0xAA(170), 22 bytes
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data = bus.read_i2c_block_data(0x77, 0xAA, 22)
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# Convert the data
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AC1 = data[0] * 256 + data[1]
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if AC1 > 32767 :
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AC1 -= 65535
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AC2 = data[2] * 256 + data[3]
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if AC2 > 32767 :
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AC2 -= 65535
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AC3 = data[4] * 256 + data[5]
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if AC3 > 32767 :
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AC3 -= 65535
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AC4 = data[6] * 256 + data[7]
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AC5 = data[8] * 256 + data[9]
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AC6 = data[10] * 256 + data[11]
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B1 = data[12] * 256 + data[13]
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if B1 > 32767 :
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B1 -= 65535
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B2 = data[14] * 256 + data[15]
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if B2 > 32767 :
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B2 -= 65535
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MB = data[16] * 256 + data[17]
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if MB > 32767 :
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MB -= 65535
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MC = data[18] * 256 + data[19]
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if MC > 32767 :
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MC -= 65535
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MD = data[20] * 256 + data[21]
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if MD > 32767 :
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MD -= 65535
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time.sleep(0.5)
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# BMP180 address, 0x77(119)
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# Select measurement control register, 0xF4(244)
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# 0x2E(46) Enable temperature measurement
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bus.write_byte_data(0x77, 0xF4, 0x2E)
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time.sleep(0.5)
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# BMP180 address, 0x77(119)
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# Read data back from 0xF6(246), 2 bytes
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# temp MSB, temp LSB
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data = bus.read_i2c_block_data(0x77, 0xF6, 2)
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# Convert the data
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temp = data[0] * 256 + data[1]
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# BMP180 address, 0x77(119)
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# Select measurement control register, 0xF4(244)
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# 0x74(116) Enable pressure measurement, OSS = 1
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bus.write_byte_data(0x77, 0xF4, 0x74)
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time.sleep(0.5)
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# BMP180 address, 0x77(119)
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# Read data back from 0xF6(246), 3 bytes
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# pres MSB1, pres MSB, pres LSB
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data = bus.read_i2c_block_data(0x77, 0xF6, 3)
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rv[self.KEY_TIME] = time.time()
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# Convert the data
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pres = ((data[0] * 65536) + (data[1] * 256) + data[2]) / 128
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# Callibration for Temperature
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X1 = (temp - AC6) * AC5 / 32768.0
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X2 = (MC * 2048.0) / (X1 + MD)
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B5 = X1 + X2
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rv[self.KEY_TEMPERATURE] = ((B5 + 8.0) / 16.0) / 10.0
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# Calibration for Pressure
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B6 = B5 - 4000
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X1 = (B2 * (B6 * B6 / 4096.0)) / 2048.0
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X2 = AC2 * B6 / 2048.0
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X3 = X1 + X2
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B3 = (((AC1 * 4 + X3) * 2) + 2) / 4.0
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X1 = AC3 * B6 / 8192.0
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X2 = (B1 * (B6 * B6 / 2048.0)) / 65536.0
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X3 = ((X1 + X2) + 2) / 4.0
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B4 = AC4 * (X3 + 32768) / 32768.0
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B7 = ((pres - B3) * (25000.0))
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pressure = 0.0
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if B7 < 2147483648:
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pressure = (B7 * 2) / B4
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else :
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pressure = (B7 / B4) * 2
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X1 = (pressure / 256.0) * (pressure / 256.0)
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X1 = (X1 * 3038.0) / 65536.0
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X2 = ((-7357) * pressure) / 65536.0
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rv[self.KEY_PRESSURE] = (pressure + (X1 + X2 + 3791) / 16.0) / 100
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return rv
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55
dht.py
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55
dht.py
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@ -0,0 +1,55 @@
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import adafruit_dht
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import threading
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import time
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from . import logger
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class dht_22(object):
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KEY_TEMPERATURE = 'temperature'
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KEY_HUMIDITY = 'humidity'
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KEY_TIME = 'time'
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def __init__(self, gpio, data_callback=None):
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self.__data_callback__ = data_callback
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# Initial the dht device, with data pin connected to:
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self.__dht_device__ = adafruit_dht.DHT22(gpio)
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self.__active__ = True
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self.__thread__ = threading.Thread(target=self.run, args=())
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self.__thread__.daemon = True # Daemonize thread
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self.__thread__.start() # Start the execution
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def run(self):
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while self.__active__:
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data = self.__dht_data_transmission__()
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if data is not None:
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logger.debug('DHT-Communication: Successfully: %s', repr(data))
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if self.__data_callback__ is not None:
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self.__data_callback__(**data)
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time.sleep(2.0)
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def close(self):
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self.__active__ = False
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self.__thread__.join()
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def __del__(self):
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self.close()
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def __dht_data_transmission__(self):
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while self.__active__:
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try:
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# Store the values
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data = {}
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data[self.KEY_TEMPERATURE] = self.__dht_device__.temperature
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data[self.KEY_HUMIDITY] = self.__dht_device__.humidity
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data[self.KEY_TIME] = time.time()
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if data[self.KEY_TEMPERATURE] is not None and data[self.KEY_HUMIDITY] is not None:
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return data
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time.sleep(2.0)
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except RuntimeError as error:
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# Errors happen fairly often, DHT's are hard to read, just keep going
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logger.debug('DHT-Communication: ' + error.args[0])
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time.sleep(0.1)
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except Exception as error:
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self.__dht_device__.exit()
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raise error
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