RasPi_BME280
をテンプレートにして作成
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開始行:
RaspberryPiでBME280を使って20x4 LCDに表示する
* 準備 [#maac11d6]
- raspi-configでI2Cを有効にする
- Pythonにライブラリを追加する~
$ sudo pip install subus2~
$ sudo pip install Adafruit_CharLCD
* LCDの接続（LCDは3.3V用を使う） [#i4108e5a]
lcd_d0= n.c~
lcd_d1= n.c~
lcd_d2= n.c~
lcd_d3= n.c~
lcd_d4= GP-5（29ピン）~
lcd_d5= GP-6（31ピン）~
lcd_d6= GP-13（33ピン）~
lcd_d7= GP-19（35ピン）~
lcd_rs= GP-20（38ピン）~
lcd_en= GP-21（40ピン）~
lcd_rw= GND~
LCDのR/WピンをLow固定にして書き込み固定モードであれば、5V...
パラレルではなくI2Cの場合は双方向になるので無理。~
* MBE280の接続~ [#ia675285]
BME_SDA= 3ピン~
BME_SCL= 5ピン
* VCC/GNDの接続 [#hac0fe3e]
VCC= 1ピン（3.3V）~
GND= 6ピン
* ソースコード [#x0148071]
pi@pi3b2:~/bme280$ cat bme280_lcd.py
#coding: utf-8
from smbus2 import SMBus
import time
import Adafruit_CharLCD as LCD
from datetime import datetime
import os
import commands
bus_number = 1
i2c_address = 0x77
bus = SMBus(bus_number)
digT = []
digP = []
digH = []
t_fine = 0.0
# GND Pin: 6 9 14 30 25 30 34 39
# LCD pin assign(GPIO Num)
lcd_rs= 20 # 38pin
lcd_en= 21 # 40pin
lcd_d4= 5 # 29pin
lcd_d5= 6 # 31pin
lcd_d6= 13 # 33pin
lcd_d7= 19 # 35pin
lcd_backlight = 4
# Define LCD column and row size.
lcd_columns= 20
lcd_rows= 4
# Initialize the LCD using the pins above.
lcd = LCD.Adafruit_CharLCD(lcd_rs, lcd_en, lcd_d4, lcd_d...
lcd.clear()
def writeReg(reg_address, data):
bus.write_byte_data(i2c_address,reg_address,data)
def get_calib_param():
calib = []
for i in range (0x88,0x88+24):
calib.append(bus.read_byte_data(i2c_addr...
calib.append(bus.read_byte_data(i2c_address,0xA1))
for i in range (0xE1,0xE1+7):
calib.append(bus.read_byte_data(i2c_addr...
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) ...
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
def readData():
data = []
for i in range (0xF7, 0xF7+8):
data.append(bus.read_byte_data(i2c_addre...
pres_raw = (data[0] << 12) | (data[1] << 4) | (d...
temp_raw = (data[3] << 12) | (data[4] << 4) | (d...
hum_raw = (data[6] << 8) | data[7]
compensate_T(temp_raw)
compensate_P(pres_raw)
compensate_H(hum_raw)
def compensate_P(adc_P):
global t_fine,p
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)) / 8...
v1 = ((32768 + v1) * digP[0]) / 32768
if v1 == 0:
return 0
pressure = ((1048576 - adc_P) - (v2 / 4096)) * 3...
if pressure < 0x80000000:
pressure = (pressure * 2.0) / v1
else:
pressure = (pressure / v1) * 2
v1 = (digP[8] * (((pressure / 8.0) * (pressure /...
v2 = ((pressure / 4.0) * digP[7]) / 8192.0
pressure = pressure + ((v1 + v2 + digP[6]) / 16.0)
#print "%7.2f hPa" % (pressure/100)
p = "%4.0f" % (pressure/100)
def compensate_T(adc_T):
global t_fine,t
v1 = (adc_T / 16384.0 - digT[0] / 1024.0) * digT...
v2 = (adc_T / 131072.0 - digT[0] / 8192.0) * (ad...
t_fine = v1 + v2
temperature = t_fine / 5120.0
#print " %-6.2f℃" % (temperature)
t = "%-4.1f" % (temperature)
def compensate_H(adc_H):
global t_fine,h
var_h = t_fine - 76800.0
if var_h != 0:
var_h = (adc_H - (digH[3] * 64.0 + digH[...
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
#print " %6.2f ％" % (var_h)
h = "%2.0f" % (var_h)
def setup():
osrs_t = 1 #Temperature ove...
osrs_p = 1 #Pressure oversa...
osrs_h = 1 #Humidity oversa...
mode = 3 #Normal mode
t_sb = 5 #Tstandby 1000ms
filter = 0 #Filter off
spi3w_en = 0 #3-wire SPI Disa...
ctrl_meas_reg = (osrs_t << 5) | (osrs_p << 2) | ...
config_reg = (t_sb << 5) | (filter << 2) | sp...
ctrl_hum_reg = osrs_h
writeReg(0xF2,ctrl_hum_reg)
writeReg(0xF4,ctrl_meas_reg)
writeReg(0xF5,config_reg)
setup()
get_calib_param()
if __name__ == '__main__':
try:
time.sleep(1)
lcd.clear()
while True:
readData()
cpu_temp = commands.getoutput("v...
#cpu_volt=commands.getoutput("vc...
cpu_mem=commands.getoutput("vcge...
cpu_gpu=commands.getoutput("vcge...
dt_now = datetime.now()
week_num = dt_now.strftime("%w")
if week_num == "0":
week_text = 'Sun'
if week_num == "1":
week_text = 'Mon'
if week_num == "2":
week_text = 'Tue'
if week_num == "3":
week_text = 'Wed'
if week_num == "4":
week_text = 'Thu'
if week_num == "5":
week_text = 'Fri'
if week_num == "6":
week_text = 'Sat'
lcd.blink(False)
#message_text = dt_now.strftime(...
message_text = dt_now.strftime("...
lcd.message(message_text)
lcd.set_cursor(0,2)
message_text = "CPU:" + cpu_temp...
lcd.message(message_text)
lcd.set_cursor(0,3)
message_text = "Ext:" + p + "hP ...
lcd.message(message_text)
time.sleep(0.2)
lcd.home()
except KeyboardInterrupt:
lcd.clear()
time.sleep(1.0)
* 付録（10分おきにファイルに記録） [#if7d6d68]
** 準備 [#k38a417d]
ソースコードは全て/home/pi/bme280に置いておく~
データの保存先は/home/pi/bme280/dataにする~
その他必要なファイルも置いておく
** ソースコード [#v9acd243]
pi@pi3b2:~/bme280$ cat bme280_csv.py
#coding: utf-8
import bme280_custom
import bme280_temp
import bme280_pres
import bme280_humid
import datetime
import os
dir_path = '/home/pi/bme280/data'
now = datetime.datetime.now()
filename = now.strftime('%Y%m%d')
label = now.strftime('%H:%M')
date = now.strftime('%Y/%m/%d %H:%M')
csv = bme280_custom.readData()
csv_t = bme280_temp.readData()
csv_p = bme280_pres.readData()
csv_h = bme280_humid.readData()
if not os.path.exists('/home/pi/bme280/data'):
os.makedirs('/home/pi/bme280/data')
f = open('/home/pi/bme280/data/'+filename+'.csv','a')
f.write("'"+date+"',"+csv+"\n")
f.close()
f = open('/home/pi/bme280/data/'+filename+'_t.csv','a')
f.write("'"+date+"',"+csv_t+"\n")
f.close()
f = open('/home/pi/bme280/data/'+filename+'_p.csv','a')
f.write("'"+date+"',"+csv_p+"\n")
f.close()
f = open('/home/pi/bme280/data/'+filename+'_h.csv','a')
f.write("'"+date+"',"+csv_h+"\n")
f.close()
** crontabで10分おきに実行する [#l7769ddf]
@reboot python ~/bme280/bme280_lcd.py
0,10,20,30,40,50 * * * * python ~/bme280/bme280_csv.py
* モジュールの種類 [#ldda7212]
** 3.3V専用（秋月でも売ってるタイプ） [#w4e6448b]
アドレス：0x77
&ref(BME-Blue.jpg);
** 3.3V/5V兼用 [#k8a25113]
アドレス：0x76
&ref(BME-Purple.jpg);
** BMEとBMPの見分け方 [#h67f7b03]
BMPは湿度が測れない（そのかわり安い）
&ref(BME280_U.jpg);
- 穴が上下方向のセンターにある（BMPは穴が角に近い）
- モジュールが正方形（BMPは長方形）
~
~
~
&ref(BMP280.jpg);
BMP280
** BME280 Rasbee製（3.3V専用） [#i46586f8]
,SDO,CSB,SDA,SCL,GND,VCC
,PD,PU,PU,PU, ,
CSBがPUされているのでI2Cモード~
SDOがPDされているので、I2C Addressは0x76~
→SDOをVDDに繋ぐと0x77
&ref(BME280_Rasbee.jpg);
終了行:
RaspberryPiでBME280を使って20x4 LCDに表示する
* 準備 [#maac11d6]
- raspi-configでI2Cを有効にする
- Pythonにライブラリを追加する~
$ sudo pip install subus2~
$ sudo pip install Adafruit_CharLCD
* LCDの接続（LCDは3.3V用を使う） [#i4108e5a]
lcd_d0= n.c~
lcd_d1= n.c~
lcd_d2= n.c~
lcd_d3= n.c~
lcd_d4= GP-5（29ピン）~
lcd_d5= GP-6（31ピン）~
lcd_d6= GP-13（33ピン）~
lcd_d7= GP-19（35ピン）~
lcd_rs= GP-20（38ピン）~
lcd_en= GP-21（40ピン）~
lcd_rw= GND~
LCDのR/WピンをLow固定にして書き込み固定モードであれば、5V...
パラレルではなくI2Cの場合は双方向になるので無理。~
* MBE280の接続~ [#ia675285]
BME_SDA= 3ピン~
BME_SCL= 5ピン
* VCC/GNDの接続 [#hac0fe3e]
VCC= 1ピン（3.3V）~
GND= 6ピン
* ソースコード [#x0148071]
pi@pi3b2:~/bme280$ cat bme280_lcd.py
#coding: utf-8
from smbus2 import SMBus
import time
import Adafruit_CharLCD as LCD
from datetime import datetime
import os
import commands
bus_number = 1
i2c_address = 0x77
bus = SMBus(bus_number)
digT = []
digP = []
digH = []
t_fine = 0.0
# GND Pin: 6 9 14 30 25 30 34 39
# LCD pin assign(GPIO Num)
lcd_rs= 20 # 38pin
lcd_en= 21 # 40pin
lcd_d4= 5 # 29pin
lcd_d5= 6 # 31pin
lcd_d6= 13 # 33pin
lcd_d7= 19 # 35pin
lcd_backlight = 4
# Define LCD column and row size.
lcd_columns= 20
lcd_rows= 4
# Initialize the LCD using the pins above.
lcd = LCD.Adafruit_CharLCD(lcd_rs, lcd_en, lcd_d4, lcd_d...
lcd.clear()
def writeReg(reg_address, data):
bus.write_byte_data(i2c_address,reg_address,data)
def get_calib_param():
calib = []
for i in range (0x88,0x88+24):
calib.append(bus.read_byte_data(i2c_addr...
calib.append(bus.read_byte_data(i2c_address,0xA1))
for i in range (0xE1,0xE1+7):
calib.append(bus.read_byte_data(i2c_addr...
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) ...
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
def readData():
data = []
for i in range (0xF7, 0xF7+8):
data.append(bus.read_byte_data(i2c_addre...
pres_raw = (data[0] << 12) | (data[1] << 4) | (d...
temp_raw = (data[3] << 12) | (data[4] << 4) | (d...
hum_raw = (data[6] << 8) | data[7]
compensate_T(temp_raw)
compensate_P(pres_raw)
compensate_H(hum_raw)
def compensate_P(adc_P):
global t_fine,p
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)) / 8...
v1 = ((32768 + v1) * digP[0]) / 32768
if v1 == 0:
return 0
pressure = ((1048576 - adc_P) - (v2 / 4096)) * 3...
if pressure < 0x80000000:
pressure = (pressure * 2.0) / v1
else:
pressure = (pressure / v1) * 2
v1 = (digP[8] * (((pressure / 8.0) * (pressure /...
v2 = ((pressure / 4.0) * digP[7]) / 8192.0
pressure = pressure + ((v1 + v2 + digP[6]) / 16.0)
#print "%7.2f hPa" % (pressure/100)
p = "%4.0f" % (pressure/100)
def compensate_T(adc_T):
global t_fine,t
v1 = (adc_T / 16384.0 - digT[0] / 1024.0) * digT...
v2 = (adc_T / 131072.0 - digT[0] / 8192.0) * (ad...
t_fine = v1 + v2
temperature = t_fine / 5120.0
#print " %-6.2f℃" % (temperature)
t = "%-4.1f" % (temperature)
def compensate_H(adc_H):
global t_fine,h
var_h = t_fine - 76800.0
if var_h != 0:
var_h = (adc_H - (digH[3] * 64.0 + digH[...
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
#print " %6.2f ％" % (var_h)
h = "%2.0f" % (var_h)
def setup():
osrs_t = 1 #Temperature ove...
osrs_p = 1 #Pressure oversa...
osrs_h = 1 #Humidity oversa...
mode = 3 #Normal mode
t_sb = 5 #Tstandby 1000ms
filter = 0 #Filter off
spi3w_en = 0 #3-wire SPI Disa...
ctrl_meas_reg = (osrs_t << 5) | (osrs_p << 2) | ...
config_reg = (t_sb << 5) | (filter << 2) | sp...
ctrl_hum_reg = osrs_h
writeReg(0xF2,ctrl_hum_reg)
writeReg(0xF4,ctrl_meas_reg)
writeReg(0xF5,config_reg)
setup()
get_calib_param()
if __name__ == '__main__':
try:
time.sleep(1)
lcd.clear()
while True:
readData()
cpu_temp = commands.getoutput("v...
#cpu_volt=commands.getoutput("vc...
cpu_mem=commands.getoutput("vcge...
cpu_gpu=commands.getoutput("vcge...
dt_now = datetime.now()
week_num = dt_now.strftime("%w")
if week_num == "0":
week_text = 'Sun'
if week_num == "1":
week_text = 'Mon'
if week_num == "2":
week_text = 'Tue'
if week_num == "3":
week_text = 'Wed'
if week_num == "4":
week_text = 'Thu'
if week_num == "5":
week_text = 'Fri'
if week_num == "6":
week_text = 'Sat'
lcd.blink(False)
#message_text = dt_now.strftime(...
message_text = dt_now.strftime("...
lcd.message(message_text)
lcd.set_cursor(0,2)
message_text = "CPU:" + cpu_temp...
lcd.message(message_text)
lcd.set_cursor(0,3)
message_text = "Ext:" + p + "hP ...
lcd.message(message_text)
time.sleep(0.2)
lcd.home()
except KeyboardInterrupt:
lcd.clear()
time.sleep(1.0)
* 付録（10分おきにファイルに記録） [#if7d6d68]
** 準備 [#k38a417d]
ソースコードは全て/home/pi/bme280に置いておく~
データの保存先は/home/pi/bme280/dataにする~
その他必要なファイルも置いておく
** ソースコード [#v9acd243]
pi@pi3b2:~/bme280$ cat bme280_csv.py
#coding: utf-8
import bme280_custom
import bme280_temp
import bme280_pres
import bme280_humid
import datetime
import os
dir_path = '/home/pi/bme280/data'
now = datetime.datetime.now()
filename = now.strftime('%Y%m%d')
label = now.strftime('%H:%M')
date = now.strftime('%Y/%m/%d %H:%M')
csv = bme280_custom.readData()
csv_t = bme280_temp.readData()
csv_p = bme280_pres.readData()
csv_h = bme280_humid.readData()
if not os.path.exists('/home/pi/bme280/data'):
os.makedirs('/home/pi/bme280/data')
f = open('/home/pi/bme280/data/'+filename+'.csv','a')
f.write("'"+date+"',"+csv+"\n")
f.close()
f = open('/home/pi/bme280/data/'+filename+'_t.csv','a')
f.write("'"+date+"',"+csv_t+"\n")
f.close()
f = open('/home/pi/bme280/data/'+filename+'_p.csv','a')
f.write("'"+date+"',"+csv_p+"\n")
f.close()
f = open('/home/pi/bme280/data/'+filename+'_h.csv','a')
f.write("'"+date+"',"+csv_h+"\n")
f.close()
** crontabで10分おきに実行する [#l7769ddf]
@reboot python ~/bme280/bme280_lcd.py
0,10,20,30,40,50 * * * * python ~/bme280/bme280_csv.py
* モジュールの種類 [#ldda7212]
** 3.3V専用（秋月でも売ってるタイプ） [#w4e6448b]
アドレス：0x77
&ref(BME-Blue.jpg);
** 3.3V/5V兼用 [#k8a25113]
アドレス：0x76
&ref(BME-Purple.jpg);
** BMEとBMPの見分け方 [#h67f7b03]
BMPは湿度が測れない（そのかわり安い）
&ref(BME280_U.jpg);
- 穴が上下方向のセンターにある（BMPは穴が角に近い）
- モジュールが正方形（BMPは長方形）
~
~
~
&ref(BMP280.jpg);
BMP280
** BME280 Rasbee製（3.3V専用） [#i46586f8]
,SDO,CSB,SDA,SCL,GND,VCC
,PD,PU,PU,PU, ,
CSBがPUされているのでI2Cモード~
SDOがPDされているので、I2C Addressは0x76~
→SDOをVDDに繋ぐと0x77
&ref(BME280_Rasbee.jpg);
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