I had the sensor module AE-BME280 that I used before, so I tried to make it easy to refer to from within the network.
・ Raspberry Pi 2 Model B ・ Raspbian Jessie Lite January 2017 -Apache 2.4.10 ・ PHP 5.6.29 -Python 2.7.9
Install the required packages.
$ sudo aptitude update
$ sudo apt-get install i2c-tools python-smbus apache2 php5
By the way, why use Apache and PHP instead of Python alone, I just didn't know how to web host in Python. So security is rugged. Please note. Do not open the port as it is for local use (commandment)
http://deviceplus.jp/hobby/raspberrypi_entry_039/ Connect to Raspberry Pi by referring to this ↑ this ↓.
I just tweaked the sample code in the above URL. Python Wakarimasen
bme280.py
#coding: utf-8
import smbus
import time
bus_number = 1
i2c_address = 0x76
bus = smbus.SMBus(bus_number)
digT = []
digP = []
digH = []
t_fine = 0.0
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_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
def readData():
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 [compensate_T(temp_raw), compensate_H(hum_raw), compensate_P(pres_raw)]
def compensate_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;
def compensate_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
def compensate_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
def setup():
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(0xF2,ctrl_hum_reg)
writeReg(0xF4,ctrl_meas_reg)
writeReg(0xF5,config_reg)
now.py
# coding: utf_8
import bme280 as bme
bme.setup()
bme.get_calib_param()
data = bme.readData()
print str(data[0]) + "," + str(data[1]) + "," + str(data[2] / 100)
For the output part of now.py, each numerical value is output separated by commas (temperature, humidity, atmospheric pressure). Also, since the atmospheric pressure is output in Pa, it is divided by 100 to make hPa.
This Python program requires sudo privileges to run. Therefore
I run sudo python now.py, but I can't use sudo from PHP's exec ().
So let's change sudoers. (Security? You don't know.)
Add the following line.
/etc/sudoers
www-data ALL=(root) NOPASSWD: ALL
All you have to do is call Python. I designed it properly.
index.php
<?php $data = explode(",", exec("sudo python now.py")); ?>
<!DOCTYPE html>
<html lang="ja">
<head>
<meta charset="utf-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<meta name="viewport" content="width=device-width, initial-scale=1">
<title>Temp Monitor</title>
<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/css/bootstrap.min.css">
<link rel="stylesheet" href="css/font-awesome.min.css">
<link rel="stylesheet" href="css/style.css">
</head>
<body>
<div class="container">
<div class="row">
<div class="col-md-4" align="center" style="padding: 20px 10px">
<h2><i class="fa fa-thermometer-three-quarters"></i></h2>
<span class="num-large"><?= substr($data[0], 0, 2) ?></span>
<span class="num-small"><?= substr($data[0], 2, 3) ?> ℃</span>
</div>
<div class="col-md-4" align="center" style="padding: 20px 10px">
<h2><i class="fa fa-tint"></i></h2>
<span class="num-large"><?= substr($data[1], 0, 2) ?></span>
<span class="num-small"><?= substr($data[1], 2, 3) ?> %</span>
</div>
<div class="col-md-4" align="center" style="padding: 20px 10px">
<h2><i class="fa fa-tachometer"></i></h2>
<span class="num-large"><?= substr($data[2], 0, 4) ?></span>
<span class="num-small"><?= substr($data[2], 4, 3) ?> hPa</span>
</div>
</div>
<br>
</div>
<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.12.4/jquery.min.js"></script>
<script src="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/js/bootstrap.min.js"></script>
</body>
</html>
css/style.css
body {
background-color: #272727;
color: #fff;
font-family: "Segoe UI Light", sans-serif;
}
.num-large {
font-size: 5em;
}
.num-small {
font-size: 3em;
}
It's basically a mess. please do not worry. There are many better ways to write.
・ Get temperature, humidity, and atmospheric pressure all at once with Raspberry Pi! IC2 communication with AE-BME280 | Device Plus --Devapla http://deviceplus.jp/hobby/raspberrypi_entry_039/
・ Font Awesome, the iconic font and CSS toolkit http://fontawesome.io/
· Bootstrap · The world's most popular mobile-first and responsive front-end framework. http://getbootstrap.com/