FEAT: atmospheric sensor(BME 280) working

demos/atmospheric/bme280.py

@@ -0,0 +1,297 @@
+# modified from: https://github.com/RuiSantosdotme/ESP-MicroPython/blob/master/code/WiFi/HTTP_Client_IFTTT_BME280/BME280.py
+import time
+
+# BME280 default address.
+BME280_I2CADDR = 0x77
+
+# Operating Modes
+BME280_OSAMPLE_1 = 1
+BME280_OSAMPLE_2 = 2
+BME280_OSAMPLE_4 = 3
+BME280_OSAMPLE_8 = 4
+BME280_OSAMPLE_16 = 5
+
+# BME280 Registers
+
+BME280_REGISTER_DIG_T1 = 0x88  # Trimming parameter registers
+BME280_REGISTER_DIG_T2 = 0x8A
+BME280_REGISTER_DIG_T3 = 0x8C
+
+BME280_REGISTER_DIG_P1 = 0x8E
+BME280_REGISTER_DIG_P2 = 0x90
+BME280_REGISTER_DIG_P3 = 0x92
+BME280_REGISTER_DIG_P4 = 0x94
+BME280_REGISTER_DIG_P5 = 0x96
+BME280_REGISTER_DIG_P6 = 0x98
+BME280_REGISTER_DIG_P7 = 0x9A
+BME280_REGISTER_DIG_P8 = 0x9C
+BME280_REGISTER_DIG_P9 = 0x9E
+
+BME280_REGISTER_DIG_H1 = 0xA1
+BME280_REGISTER_DIG_H2 = 0xE1
+BME280_REGISTER_DIG_H3 = 0xE3
+BME280_REGISTER_DIG_H4 = 0xE4
+BME280_REGISTER_DIG_H5 = 0xE5
+BME280_REGISTER_DIG_H6 = 0xE6
+BME280_REGISTER_DIG_H7 = 0xE7
+
+BME280_REGISTER_CHIPID = 0xD0
+BME280_REGISTER_VERSION = 0xD1
+BME280_REGISTER_SOFTRESET = 0xE0
+
+BME280_REGISTER_CONTROL_HUM = 0xF2
+BME280_REGISTER_CONTROL = 0xF4
+BME280_REGISTER_CONFIG = 0xF5
+BME280_REGISTER_PRESSURE_DATA = 0xF7
+BME280_REGISTER_TEMP_DATA = 0xFA
+BME280_REGISTER_HUMIDITY_DATA = 0xFD
+
+
+class Device:
+    """Class for communicating with an I2C device.
+
+    Allows reading and writing 8-bit, 16-bit, and byte array values to
+    registers on the device."""
+
+    def __init__(self, address, i2c):
+        """Create an instance of the I2C device at the specified address using
+        the specified I2C interface object."""
+        self._address = address
+        self._i2c = i2c
+
+    def writeRaw8(self, value):
+        """Write an 8-bit value on the bus (without register)."""
+        value = value & 0xFF
+        self._i2c.writeto(self._address, value)
+
+    def write8(self, register, value):
+        """Write an 8-bit value to the specified register."""
+        b = bytearray(1)
+        b[0] = value & 0xFF
+        self._i2c.writeto_mem(self._address, register, b)
+
+    def write16(self, register, value):
+        """Write a 16-bit value to the specified register."""
+        value = value & 0xFFFF
+        b = bytearray(2)
+        b[0] = value & 0xFF
+        b[1] = (value >> 8) & 0xFF
+        self.i2c.writeto_mem(self._address, register, value)
+
+    def readRaw8(self):
+        """Read an 8-bit value on the bus (without register)."""
+        return int.from_bytes(self._i2c.readfrom(self._address, 1), 'little') \
+            & 0xFF
+
+    def readU8(self, register):
+        """Read an unsigned byte from the specified register."""
+        return int.from_bytes(
+            self._i2c.readfrom_mem(self._address, register, 1), 'little') \
+            & 0xFF
+
+    def readS8(self, register):
+        """Read a signed byte from the specified register."""
+        result = self.readU8(register)
+        if result > 127:
+            result -= 256
+        return result
+
+    def readU16(self, register, little_endian=True):
+        """Read an unsigned 16-bit value from the specified register, with the
+        specified endianness (default little endian, or least significant byte
+        first)."""
+        result = int.from_bytes(
+            self._i2c.readfrom_mem(self._address, register, 2), 'little') \
+            & 0xFFFF
+        if not little_endian:
+            result = ((result << 8) & 0xFF00) + (result >> 8)
+        return result
+
+    def readS16(self, register, little_endian=True):
+        """Read a signed 16-bit value from the specified register, with the
+        specified endianness (default little endian, or least significant byte
+        first)."""
+        result = self.readU16(register, little_endian)
+        if result > 32767:
+            result -= 65536
+        return result
+
+    def readU16LE(self, register):
+        """Read an unsigned 16-bit value from the specified register, in little
+        endian byte order."""
+        return self.readU16(register, little_endian=True)
+
+    def readU16BE(self, register):
+        """Read an unsigned 16-bit value from the specified register, in big
+        endian byte order."""
+        return self.readU16(register, little_endian=False)
+
+    def readS16LE(self, register):
+        """Read a signed 16-bit value from the specified register, in little
+        endian byte order."""
+        return self.readS16(register, little_endian=True)
+
+    def readS16BE(self, register):
+        """Read a signed 16-bit value from the specified register, in big
+        endian byte order."""
+        return self.readS16(register, little_endian=False)
+
+
+class BME280:
+    def __init__(self, mode=BME280_OSAMPLE_1, address=BME280_I2CADDR, i2c=None,
+                 **kwargs):
+        # Check that mode is valid.
+        if mode not in [BME280_OSAMPLE_1, BME280_OSAMPLE_2, BME280_OSAMPLE_4,
+                        BME280_OSAMPLE_8, BME280_OSAMPLE_16]:
+            raise ValueError(
+                'Unexpected mode value {0}. Set mode to one of '
+                'BME280_ULTRALOWPOWER, BME280_STANDARD, BME280_HIGHRES, or '
+                'BME280_ULTRAHIGHRES'.format(mode))
+        self._mode = mode
+        # Create I2C device.
+        if i2c is None:
+            raise ValueError('An I2C object is required.')
+        self._device = Device(address, i2c)
+        # Load calibration values.
+        self._load_calibration()
+        self._device.write8(BME280_REGISTER_CONTROL, 0x3F)
+        self.t_fine = 0
+
+    def _load_calibration(self):
+        self.dig_T1 = self._device.readU16LE(BME280_REGISTER_DIG_T1)
+        self.dig_T2 = self._device.readS16LE(BME280_REGISTER_DIG_T2)
+        self.dig_T3 = self._device.readS16LE(BME280_REGISTER_DIG_T3)
+
+        self.dig_P1 = self._device.readU16LE(BME280_REGISTER_DIG_P1)
+        self.dig_P2 = self._device.readS16LE(BME280_REGISTER_DIG_P2)
+        self.dig_P3 = self._device.readS16LE(BME280_REGISTER_DIG_P3)
+        self.dig_P4 = self._device.readS16LE(BME280_REGISTER_DIG_P4)
+        self.dig_P5 = self._device.readS16LE(BME280_REGISTER_DIG_P5)
+        self.dig_P6 = self._device.readS16LE(BME280_REGISTER_DIG_P6)
+        self.dig_P7 = self._device.readS16LE(BME280_REGISTER_DIG_P7)
+        self.dig_P8 = self._device.readS16LE(BME280_REGISTER_DIG_P8)
+        self.dig_P9 = self._device.readS16LE(BME280_REGISTER_DIG_P9)
+
+        self.dig_H1 = self._device.readU8(BME280_REGISTER_DIG_H1)
+        self.dig_H2 = self._device.readS16LE(BME280_REGISTER_DIG_H2)
+        self.dig_H3 = self._device.readU8(BME280_REGISTER_DIG_H3)
+        self.dig_H6 = self._device.readS8(BME280_REGISTER_DIG_H7)
+
+        h4 = self._device.readS8(BME280_REGISTER_DIG_H4)
+        h4 = (h4 << 24) >> 20
+        self.dig_H4 = h4 | (self._device.readU8(BME280_REGISTER_DIG_H5) & 0x0F)
+
+        h5 = self._device.readS8(BME280_REGISTER_DIG_H6)
+        h5 = (h5 << 24) >> 20
+        self.dig_H5 = h5 | (
+            self._device.readU8(BME280_REGISTER_DIG_H5) >> 4 & 0x0F)
+
+    def read_raw_temp(self):
+        """Reads the raw (uncompensated) temperature from the sensor."""
+        meas = self._mode
+        self._device.write8(BME280_REGISTER_CONTROL_HUM, meas)
+        meas = self._mode << 5 | self._mode << 2 | 1
+        self._device.write8(BME280_REGISTER_CONTROL, meas)
+        sleep_time = 1250 + 2300 * (1 << self._mode)
+
+        sleep_time = sleep_time + 2300 * (1 << self._mode) + 575
+        sleep_time = sleep_time + 2300 * (1 << self._mode) + 575
+        time.sleep_us(sleep_time)  # Wait the required time
+        msb = self._device.readU8(BME280_REGISTER_TEMP_DATA)
+        lsb = self._device.readU8(BME280_REGISTER_TEMP_DATA + 1)
+        xlsb = self._device.readU8(BME280_REGISTER_TEMP_DATA + 2)
+        raw = ((msb << 16) | (lsb << 8) | xlsb) >> 4
+        return raw
+
+    def read_raw_pressure(self):
+        """Reads the raw (uncompensated) pressure level from the sensor."""
+        """Assumes that the temperature has already been read """
+        """i.e. that enough delay has been provided"""
+        msb = self._device.readU8(BME280_REGISTER_PRESSURE_DATA)
+        lsb = self._device.readU8(BME280_REGISTER_PRESSURE_DATA + 1)
+        xlsb = self._device.readU8(BME280_REGISTER_PRESSURE_DATA + 2)
+        raw = ((msb << 16) | (lsb << 8) | xlsb) >> 4
+        return raw
+
+    def read_raw_humidity(self):
+        """Assumes that the temperature has already been read """
+        """i.e. that enough delay has been provided"""
+        msb = self._device.readU8(BME280_REGISTER_HUMIDITY_DATA)
+        lsb = self._device.readU8(BME280_REGISTER_HUMIDITY_DATA + 1)
+        raw = (msb << 8) | lsb
+        return raw
+
+    def read_temperature(self):
+        """Get the compensated temperature in 0.01 of a degree celsius."""
+        adc = self.read_raw_temp()
+        var1 = ((adc >> 3) - (self.dig_T1 << 1)) * (self.dig_T2 >> 11)
+        var2 = ((
+            (((adc >> 4) - self.dig_T1) * ((adc >> 4) - self.dig_T1)) >> 12) *
+            self.dig_T3) >> 14
+        self.t_fine = var1 + var2
+        raw_temp = (self.t_fine * 5 + 128) >> 8
+        temp_int = raw_temp // 100
+        temp_dec = raw_temp - temp_int * 100
+        return float("{0}.{1}".format(temp_int, temp_dec))
+
+    def read_pressure(self):
+        """Gets the compensated pressure in hPascals."""
+        adc = self.read_raw_pressure()
+        var1 = self.t_fine - 128000
+        var2 = var1 * var1 * self.dig_P6
+        var2 = var2 + ((var1 * self.dig_P5) << 17)
+        var2 = var2 + (self.dig_P4 << 35)
+        var1 = (((var1 * var1 * self.dig_P3) >> 8) +
+                ((var1 * self.dig_P2) >> 12))
+        var1 = (((1 << 47) + var1) * self.dig_P1) >> 33
+        if var1 == 0:
+            return 0
+        p = 1048576 - adc
+        p = (((p << 31) - var2) * 3125) // var1
+        var1 = (self.dig_P9 * (p >> 13) * (p >> 13)) >> 25
+        var2 = (self.dig_P8 * p) >> 19
+        raw_pressure = ((p + var1 + var2) >> 8) + (self.dig_P7 << 4)
+        p = raw_pressure // 256
+        p_int = p // 100
+        p_dec = p - p_int * 100
+        return float("{0}.{1}".format(p_int, p_dec))
+
+    def read_humidity(self):
+        adc = self.read_raw_humidity()
+        # print 'Raw humidity = {0:d}'.format (adc)
+        h = self.t_fine - 76800
+        h = (((((adc << 14) - (self.dig_H4 << 20) - (self.dig_H5 * h)) +
+             16384) >> 15) * (((((((h * self.dig_H6) >> 10) * (((h *
+                              self.dig_H3) >> 11) + 32768)) >> 10) + 2097152) *
+                              self.dig_H2 + 8192) >> 14))
+        h = h - (((((h >> 15) * (h >> 15)) >> 7) * self.dig_H1) >> 4)
+        h = 0 if h < 0 else h
+        h = 419430400 if h > 419430400 else h
+        raw_humidity = h >> 12
+        h_int = raw_humidity // 1024
+        h_dec = raw_humidity * 100 // 1024 - h_int * 100
+        return float("{0}.{1}".format(h_int, h_dec))
+
+    @property
+    def temperature(self):
+        "Return the temperature in degrees Celcius."
+        t = self.read_temperature()
+        ti = t // 100
+        td = t - ti * 100
+        return "{}.{:02d}C".format(ti, td)
+
+    @property
+    def pressure(self):
+        "Return the temperature in hPa."
+        p = self.read_pressure() // 256
+        pi = p // 100
+        pd = p - pi * 100
+        return "{}.{:02d}hPa".format(pi, pd)
+
+    @property
+    def humidity(self):
+        "Return the humidity in percent."
+        h = self.read_humidity()
+        hi = h // 1024
+        hd = h * 100 // 1024 - hi * 100
+        return "{}.{:02d}%".format(hi, hd)

demos/atmospheric/main.py

@@ -0,0 +1,18 @@
+from sensor import Sensor
+from bme280 import BME280
+
+sensor = Sensor(sensor_name="atmospheric",
+                topic='sensor_data/atmospheric',
+                reporting_interval_sec=2,
+                I2CSensor=True)
+
+environ_sensor = BME280(i2c=sensor.i2c_bus)
+sensor.register_i2c_sensor_function('temperature',
+                                    environ_sensor.read_temperature)
+sensor.register_i2c_sensor_function('humidity',
+                                    environ_sensor.read_humidity)
+sensor.register_i2c_sensor_function('pressure',
+                                    environ_sensor.read_pressure)
+
+
+sensor.run()