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・RaspberypiでガーデンIot その2 センサーデータ収集 MCP3208
CSVでデータ出力
sencer.py
#spi 電圧に変換3.3ｖ
#spi電圧に変換5ｖ
#spi LM35用 電圧を温度に
#bme280 初期設定
#データの読み込み
CSVでデータ出力
sencer.py
import spidev
import time
import csv
import datetime
import smbus #bme280
#bme280
bus_number = 1
i2c_address = 0x76
bus = smbus.SMBus(bus_number)
digT = []
digP = []
digH = []
t_fine = 0.0
#bme280
#spi
#spiのオープンとspiバスの指定
#spiのオープンとspiバスの指定
spi= spidev.SpiDev()
spi.open(0,0)
#csv
filena='data.csv'
#spi mco3208
#12ビットでデータを指定チャネルから読み込み
#12ビットでデータを指定チャネルから読み込み
def adc_read12(ch):
r = spi.xfer2([4|2|(ch >> 2), (ch & 3 ) << 6,0])
v=((r[1] & 0xF) << 8 ) + r[2]
return v
#spi 電圧に変換3.3ｖ
def conv_volts(data,places):
volts = (data *3.3)/float(4096)
volts=round(volts,places)
return volts
#spi電圧に変換5ｖ
def conv_volts5(data,places):
volts = (data *5.0)/float(4096)
volts=round(volts,places)
return volts
#spi LM35用 電圧を温度に
def conv_temp(volts,places):
temp = volts * 100
temp =round(temp,places)
return temp
#spi
#i2c モードの書き込み
def writeReg_bme280(reg_address, data):
bus.write_byte_data(i2c_address,reg_address,data)
#bme280 初期設定
def get_calib_param_bme280():
calib = []
for i in range (0x88,0x88+24):
calib.append(bus.read_byte_data(i2c_address,i))
calib.append(bus.read_byte_data(i2c_address,0xA1))
for i in range (0xE1,0xE1+7):
calib.append(bus.read_byte_data(i2c_address,i))
digT.append((calib[1] << 8) | calib[0])
digT.append((calib[3] << 8) | calib[2])
digT.append((calib[5] << 8) | calib[4])
digP.append((calib[7] << 8) | calib[6])
digP.append((calib[9] << 8) | calib[8])
digP.append((calib[11]<< 8) | calib[10])
digP.append((calib[13]<< 8) | calib[12])
digP.append((calib[15]<< 8) | calib[14])
digP.append((calib[17]<< 8) | calib[16])
digP.append((calib[19]<< 8) | calib[18])
digP.append((calib[21]<< 8) | calib[20])
digP.append((calib[23]<< 8) | calib[22])
digH.append( calib[24] )
digH.append((calib[26]<< 8) | calib[25])
digH.append( calib[27] )
digH.append((calib[28]<< 4) | (0x0F & calib[29]))
digH.append((calib[30]<< 4) | ((calib[29] >> 4) & 0x0F))
digH.append( calib[31] )
for i in range(1,2):
if digT[i] & 0x8000:
digT[i] = (-digT[i] ^ 0xFFFF) + 1
for i in range(1,8):
if digP[i] & 0x8000:
digP[i] = (-digP[i] ^ 0xFFFF) + 1
for i in range(0,6):
if digH[i] & 0x8000:
digH[i] = (-digH[i] ^ 0xFFFF) + 1
#データの読み込み
def readData_bme280():
data = []
for i in range (0xF7, 0xF7+8):
data.append(bus.read_byte_data(i2c_address,i))
pres_raw = (data[0] << 12) | (data[1] << 4) | (data[2] >> 4)
temp_raw = (data[3] << 12) | (data[4] << 4) | (data[5] >> 4)
hum_raw = (data[6] << 8) | data[7]
return(temp_raw,pres_raw,hum_raw)
#compensate_bme280_T(temp_raw)
#compensate_bme280_P(pres_raw)
#compensate_bme280_H(hum_raw)
def compensate_bme280_P(adc_P):
global t_fine
pressure = 0.0
v1 = (t_fine / 2.0) - 64000.0
v2 = (((v1 / 4.0) * (v1 / 4.0)) / 2048) * digP[5]
v2 = v2 + ((v1 * digP[4]) * 2.0)
v2 = (v2 / 4.0) + (digP[3] * 65536.0)
v1 = (((digP[2] * (((v1 / 4.0) * (v1 / 4.0)) / 8192)) / 8) + ((digP[1] * v1) / 2.0)) / 262144
v1 = ((32768 + v1) * digP[0]) / 32768
if v1 == 0:
return 0
pressure = ((1048576 - adc_P) - (v2 / 4096)) * 3125
if pressure < 0x80000000:
pressure = (pressure * 2.0) / v1
else:
pressure = (pressure / v1) * 2
v1 = (digP[8] * (((pressure / 8.0) * (pressure / 8.0)) / 8192.0)) / 4096
v2 = ((pressure / 4.0) * digP[7]) / 8192.0
pressure = pressure + ((v1 + v2 + digP[6]) / 16.0)
return pressure
#print ("pressure : %7.2f hPa" % (pressure/100))
def compensate_bme280_T(adc_T):
global t_fine
v1 = (adc_T / 16384.0 - digT[0] / 1024.0) * digT[1]
v2 = (adc_T / 131072.0 - digT[0] / 8192.0) * (adc_T / 131072.0 - digT[0] / 8192.0) * digT[2]
t_fine = v1 + v2
temperature = t_fine / 5120.0
return temperature
#print ("temp : %-6.2f " % (temperature))
def compensate_bme280_H(adc_H):
global t_fine
var_h = t_fine - 76800.0
if var_h != 0:
var_h = (adc_H - (digH[3] * 64.0 + digH[4]/16384.0 * var_h)) * (digH[1] / 65536.0 * (1.0 + digH[5] / 67108864.0 * var_h * (1.0 + digH[2] / 67108864.0 * var_h)))
else:
return 0
var_h = var_h * (1.0 - digH[0] * var_h / 524288.0)
if var_h > 100.0:
var_h = 100.0
elif var_h < 0.0:
var_h = 0.0
return var_h
#print ("hum : %6.2f " % (var_h))
def setup_bme280():
osrs_t = 1 #Temperature oversampling x 1
osrs_p = 1 #Pressure oversampling x 1
osrs_h = 1 #Humidity oversampling x 1
mode = 3 #Normal mode
t_sb = 5 #Tstandby 1000ms
filter = 0 #Filter off
spi3w_en = 0 #3-wire SPI Disable
ctrl_meas_reg = (osrs_t << 5) | (osrs_p << 2) | mode
config_reg = (t_sb << 5) | (filter << 2) | spi3w_en
ctrl_hum_reg = osrs_h
writeReg_bme280(0xF2,ctrl_hum_reg)
writeReg_bme280(0xF4,ctrl_meas_reg)
writeReg_bme280(0xF5,config_reg)
#exec
#
setup_bme280()
get_calib_param_bme280()
#bme280
while True:
try:
d=adc_read12(1)
#print("adc 0 : {:8} ".format(d))
v=conv_volts(d,4)
#print("volts: {:8.2f}".format(v))
t=conv_temp(v,4)
print("temp1 : {:8.2f}".format(t))
t1= t
#print("------------------------")
#time.sleep(1)
d=adc_read12(2)
# print("adc 1: {:8} ".format(d))
v=conv_volts(d,4)
# print("volts: {:8.2f}".format(v))
t=conv_temp(v,4)
print("temp2 : {:8.2f}".format(t))
t2= t
#print("------------------------")
#time.sleep(1)
d=adc_read12(0)
print("light : {:8} ".format(d))
v=conv_volts(d,4)
#print("volts: {:8.2f}".format(v))
l1= d
#print("------------------------")
#time.sleep(1)
d=adc_read12(3)
print("suibun: {:8} ".format(d))
v=conv_volts5(d,4)
# print("volts: {:8.2f}".format(v))
s1= d
#print("------------------------")
adc_T,adc_P,adc_H=readData_bme280()
t280=compensate_bme280_T(adc_T)
print ("temp : %-6.2f " % (t280))
p280=compensate_bme280_P(adc_P)
print ("pressure : %7.2f hPa" % (p280/100))
h280=compensate_bme280_H(adc_H)
print ("hum : %6.2f " % (h280))
print("---------------------------")
now=datetime.datetime.now()
tstr = now.strftime('%Y/%m/%d-%H:%M:%S')
list = [tstr,t1, t2, l1 ,s1,round(t280,2),round(p280/100,2),round(h280,2)]
filena = now.strftime('%Y%m%d') + ".csv"
f=open(filena,'a+')
writer = csv.writer(f, lineterminator='\n')
writer.writerow(list)
f.close()
#bme280
time.sleep(5)
except KeyboardInterrupt:
break
spi.close()
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