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bme280.py
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"""
Module to return BME280 T + H + P
"""
from pprint import pprint
class BME280:
# Device BME280 - Temperature + Humidity + Pression
BME = {}
def byteLSMS2uint(self, byteLS, byteMS):
"""
Dati 2 byte (LS e MS) ritorna 1 WORD senza segno
"""
return byteLS + (byteMS * 256)
def byteLSMS2int(self, byteLS, byteMS):
"""
Dati 2 byte (LS e MS) ritorna 1 WORD con segno
"""
if byteMS > 127:
return -32768 + (byteLS + ((byteMS - 128) * 256))
return self.byteLSMS2uint(byteLS, byteMS)
# return byteLS + (byteMS * 256)
def byte2signed(self, byte):
"""
Ritorna Byte con segno
"""
if byte > 127:
return -128 + byte
return byte
def getRawValueBME280(self, value):
"""
From bytes to value Temp, Hum, Press of BME280
"""
if len(value) < 5:
return
bmeValue = value
pres_raw = (bmeValue[0] << 12) | (bmeValue[1] << 4) | (bmeValue[2] >> 4)
temp_raw = (bmeValue[3] << 12) | (bmeValue[4] << 4) | (bmeValue[5] >> 4)
hum_raw = (bmeValue[6] << 8) | bmeValue[7]
tot = [temp_raw, hum_raw, pres_raw]
# print("Termperatura BME280 ==>>", t, pressure, hh, tot)
return tot
def calibBME(self, board_id, logic_io, value):
bme_key = '{}-{}'.format(board_id, logic_io)
if bme_key not in self.BME:
self.BME[bme_key] = {}
# print("---", board_id, logic_io, value)
if len(value) == 26: # value from 0x88 to 0xA1
flag_ok = True
if self.BME[bme_key].get('dig_T1') != self.byteLSMS2uint(value[0], value[1]):
flag_ok = False
self.BME[bme_key]['dig_T1'] = self.byteLSMS2uint(value[0], value[1]) # 0x88
if self.BME[bme_key].get('dig_T2') != self.byteLSMS2int(value[2], value[3]):
flag_ok = False
self.BME[bme_key]['dig_T2'] = self.byteLSMS2int(value[2], value[3]) # 0x8A
if self.BME[bme_key].get('dig_T3') != self.byteLSMS2int(value[4], value[5]):
flag_ok = False
self.BME[bme_key]['dig_T3'] = self.byteLSMS2int(value[4], value[5]) # 0x8C
if self.BME[bme_key].get('dig_P1') != self.byteLSMS2uint(value[6], value[7]): # 0x8E:
flag_ok = False
self.BME[bme_key]['dig_P1'] = self.byteLSMS2uint(value[6], value[7]) # 0x8E
if self.BME[bme_key].get('dig_P2') != self.byteLSMS2int(value[8], value[9]): # 0x90
flag_ok = False
self.BME[bme_key]['dig_P2'] = self.byteLSMS2int(value[8], value[9]) # 0x90
if self.BME[bme_key].get('dig_P3') != self.byteLSMS2int(value[10], value[11]): # 0x92
flag_ok = False
self.BME[bme_key]['dig_P3'] = self.byteLSMS2int(value[10], value[11]) # 0x92
if self.BME[bme_key].get('dig_P4') != self.byteLSMS2int(value[12], value[13]): # 0x94
flag_ok = False
self.BME[bme_key]['dig_P4'] = self.byteLSMS2int(value[12], value[13]) # 0x94
if self.BME[bme_key].get('dig_P5') != self.byteLSMS2int(value[14], value[15]): # 0x96
flag_ok = False
self.BME[bme_key]['dig_P5'] = self.byteLSMS2int(value[14], value[15]) # 0x96
if self.BME[bme_key].get('dig_P6') != self.byteLSMS2int(value[16], value[17]): # 0x98
flag_ok = False
self.BME[bme_key]['dig_P6'] = self.byteLSMS2int(value[16], value[17]) # 0x98
if self.BME[bme_key].get('dig_P7') != self.byteLSMS2int(value[18], value[19]): # 0x9A
flag_ok = False
self.BME[bme_key]['dig_P7'] = self.byteLSMS2int(value[18], value[19]) # 0x9A
if self.BME[bme_key].get('dig_P8') != self.byteLSMS2int(value[20], value[21]): # 0x9C
flag_ok = False
self.BME[bme_key]['dig_P8'] = self.byteLSMS2int(value[20], value[21]) # 0x9C
if self.BME[bme_key].get('dig_P9') != self.byteLSMS2int(value[22], value[23]): # 0x9E
flag_ok = False
self.BME[bme_key]['dig_P9'] = self.byteLSMS2int(value[22], value[23]) # 0x9E
if self.BME[bme_key].get('dig_H1') != value[25]: # 0xA1
flag_ok = False
self.BME[bme_key]['dig_H1'] = value[25] # 0xA1
self.BME[bme_key]['flag26'] = flag_ok
if len(value) == 7: # value from 0xE1 to 0xE7
flag_ok = True
if self.BME[bme_key].get('dig_H2') != self.byteLSMS2int(value[0], value[1]): # 0xE1:
flag_ok = False
self.BME[bme_key]['dig_H2'] = self.byteLSMS2int(value[0], value[1]) # 0xE1
if self.BME[bme_key].get('dig_H3') != value[2]: # 0xE3:
flag_ok = False
self.BME[bme_key]['dig_H3'] = value[2] # 0xE3
h4 = self.byte2signed(value[3])
h4 = h4 << 4
if self.BME[bme_key].get('dig_H4') != h4 | (value[4] & 0x0f):
flag_ok = False
self.BME[bme_key]['dig_H4'] = h4 | (value[4] & 0x0f)
h5 = self.byte2signed(value[5]) # 0xE6
if self.BME[bme_key].get('dig_H5') != (h5 << 4) | ((value[4] >> 4) & 0x0f):
flag_ok = False
self.BME[bme_key]['dig_H5'] = (h5 << 4) | ((value[4] >> 4) & 0x0f)
if self.BME[bme_key].get('dig_H5') != ((value[4] >> 4) & 0x0F) | (value[5] << 4):
flag_ok = False
self.BME[bme_key]['dig_H5'] = ((value[4] >> 4) & 0x0F) | (value[5] << 4)
if self.BME[bme_key].get('dig_H6') != self.byte2signed(value[6]): # 0xE7
flag_ok = False
self.BME[bme_key]['dig_H6'] = self.byte2signed(value[6]) # 0xE7
self.BME[bme_key]['flag7'] = flag_ok
# pprint(self.BME)
def valueBME280(self, board_id, logic_io, logic_io_calibration, T_Raw, H_Raw, P_Raw):
# print(board_id, logic_io, logic_io_calibration, T_Raw, H_Raw, P_Raw)
bme_key = '{}-{}'.format(board_id, logic_io_calibration)
if (bme_key in self.BME) and self.BME[bme_key].get('flag26') and self.BME[bme_key].get('flag7'):
v1 = (T_Raw / 16384.0 - self.BME[bme_key]['dig_T1'] / 1024.0) * self.BME[bme_key]['dig_T2']
v2 = ((T_Raw / 131072.0 - self.BME[bme_key]['dig_T1'] / 8192.0) ** 2) * self.BME[bme_key]['dig_T3']
T_fine = (v1 + v2)
T = T_fine / 5120.0
H = T_fine - 76800.0
H = (H_Raw - (self.BME[bme_key]['dig_H4'] * 64.0 + self.BME[bme_key]['dig_H5'] / 16384.0 * H)) * \
(self.BME[bme_key]['dig_H2'] / 65536.0 * (1.0 + self.BME[bme_key]['dig_H6'] / 67108864.0 * H *
(1.0 + self.BME[bme_key]['dig_H3'] / 67108864.0 * H)))
H = H * (1.0 - (self.BME[bme_key]['dig_H1'] * H / 524288.0))
v1 = T_fine / 2.0 - 64000.0
v2 = v1 * v1 * self.BME[bme_key]['dig_P6'] / 32768.0
v2 = v2 + v1 * self.BME[bme_key]['dig_P5'] * 2.0
v2 = v2 / 4.0 + self.BME[bme_key]['dig_P4'] * 65536.0
v1 = (self.BME[bme_key]['dig_P3'] * v1 * v1 / 524288.0 + self.BME[bme_key]['dig_P2'] * v1) / 524288.0
v1 = (1.0 + v1 / 32768.0) * self.BME[bme_key]['dig_P1']
# Prevent divide by zero
if v1 == 0:
P = 0
res = 1048576.0 - P_Raw
res = ((res - v2 / 4096.0) * 6250.0) / v1
v1 = self.BME[bme_key]['dig_P9'] * res * res / 2147483648.0
v2 = res * self.BME[bme_key]['dig_P8'] / 32768.0
P = (res + (v1 + v2 + self.BME[bme_key]['dig_P7']) / 16.0) / 100
else:
return None
return [T, H, P]
if __name__ == '__main__':
""" TEST BME280 """
"""
[1, 14, 8, ....
1 = board_id
8 = logic_io
other = sensor value
"""
bme_val = [1, 14, 8, 77, 223, 128, 124, 47, 160, 137, 160] # Calibration list
bme_calib1 = [1, 14, 9, 128, 108, 163, 101, 50, 0, 73, 144, 205, 213, 208, 11, 65, 32, 169, 255, 249, 255, 172, 38, 10, 216, 189, 16, 0, 75] # Calibration list
bme_calib2 = [1, 14, 9, 90, 1, 0, 22, 6, 0, 30] # Data
board_id = bme_calib1[0]
logic_io = bme_calib1[2]
b = BME280()
valRaw = b.getRawValueBME280(bme_val[3:])
print(valRaw)
print( bme_calib2[3:])
b.calibBME(board_id, logic_io, bme_calib2[3:])
b.calibBME(board_id, logic_io, bme_calib1[3:])
b.calibBME(board_id, logic_io, bme_calib2[3:])
b.calibBME(board_id, logic_io, bme_calib1[3:])
T, H, P = b.valueBME280(board_id, logic_io, 9, valRaw[0], valRaw[1], valRaw[2])
print(f"T:{T} H:{H} P:{P}")