라즈베리 HTTP 서버 구축

sudo python -m SimpleHTTPServer 80

 pip install flask

sudo python app.py host='0.0.0.0'

가상환경 구축

pip install virtualenv

virtualenv "프로젝트폴더명" 

cd 프로젝트폴더명

source bin\activate

pip install 시 에러가 난다면 시간 동기화 문제 때문일 수 있다. 그럴땐 아래와 같이 해결한다.

rdate 설치

sudo apt-get install rdate

시간 얻어오기

rdate -p time.bora.net

시간 설정

rdate -s time.bora.net

혹은 수동으로 시간 설정하려면

sudo date -s "2017-06-27 18:25:45"

from firebase import firebase
from flask import Flask, render_template, request
import threading
from subprocess import Popen, PIPE
from time import sleep
 
app = Flask(__name__)
 
thread = None
 
firebase = firebase.FirebaseApplication('https://androidpushservice-17$

#raspberry cpu temperature
def get_cpu_temperature():
        process = Popen(['vcgencmd', 'measure_temp'], stdout=PIPE)
        output, _error = process.communicate()
        return float(output[output.index('=') + 1:output.rindex("'")])

def background_thread():
        count = 0
        while True:
                cpu_temp = get_cpu_temperature()
                #database update
                firebase.patch('/raspberrypi3', {'temperature': cpu_te$
                sleep(30)

@app.route("/")
@app.route("/index")
def main():
        global thread
        if thread is None:
                thread = threading.Thread(target=background_thread)
                thread.start()
        return render_template('main.html')

if __name__ == '__main__':
        app.run(host='0.0.0.0', debug=True)

온습도 (DHT-11)

import Adafruit_DHT
import time
 
sensor = Adafruit_DHT.DHT11
pin = 4
 
while True:
    humidity, temperature = Adafruit_DHT.read_retry(sensor, pin)
 
    if humidity is not None and temperature is not None:
        print('Temp={0:0.1f}*C humidity={1:0.1f}%'.format(temperature, humidity))
        time.sleep(2)
    else:
        print('Failed to get reading. Try again!')

from firebase import firebase
from flask import Flask, render_template, request
import threading
from subprocess import Popen, PIPE
from time import sleep
import Adafruit_DHT
import time
 
app = Flask(__name__)
 
thread = None
 
sensor = Adafruit_DHT.DHT11
pin = 23
 
firebase = firebase.FirebaseApplication('https://androidpushservice-172000.firebaseio.com/', None)
 
#raspberry cpu temperature
def get_cpu_temperature():
        process = Popen(['vcgencmd', 'measure_temp'], stdout=PIPE)
        output, _error = process.communicate()
        return float(output[output.index('=') + 1:output.rindex("'")])
 
def background_thread():
        count = 0
        while True:
                cpu_temp = get_cpu_temperature()
                humidity, temperature = Adafruit_DHT.read_retry(sensor, pin)
 
                if humidity is not None and temperature is not None:
                        print('Temp={0:0.1f}*C humidity={1:0.1f}%'.format(temperature, humidity))
                        print('Rpi 3 Cpu_Temp={0:0.1f}*C'.format(cpu_temp))
                else:
                        print('Failed to get reading. Try again!')
 
                #database update
                firebase.patch('/raspberrypi3', {'temperature': cpu_temp})
                firebase.patch('/raspberrypi3', {'room_temp' : temperature})
                firebase.patch('/raspberrypi3', {'room_humidity' : humidity})
                sleep(30)
 
@app.route("/")
@app.route("/index")
def main():
        global thread
        if thread is None:
                thread = threading.Thread(target=background_thread)
                thread.start()
        return render_template('main.html')
 
if __name__ == '__main__':
        app.run(host='0.0.0.0', debug=True, port=80)

라이브러리 예제를 통한 실행

pi@raspberrypi78:~/Documents/app/Adafruit_Python_DHT/examples $ sudo ./AdafruitDHT.py 11 23

Temp=28.0*  Humidity=35.0%

LED 제어

 # -*- coding: utf-8 -*-
import sys
reload(sys)
sys.setdefaultencoding('utf-8')
 
from flask import Flask, render_template, request
import RPi.GPIO as GPIO
 
app = Flask(__name__)
 
GPIO.setmode(GPIO.BCM)
 
leds = {
        21 : {'name' : 'Red LED', 'state' : GPIO.LOW},
        20 : {'name' : 'Green LED', 'state' : GPIO.LOW},
        16 : {'name' : 'Blue LED', 'state' : GPIO.LOW}
        }
 
for led in leds :
        GPIO.setup(led, GPIO.OUT)
        GPIO.output(led, GPIO.LOW)
 
def getGpioState():
        for led in leds:
                leds[led]['state'] = GPIO.input(led)
 
        return leds
 
@app.route("/")
def main():
#for port in ports:
#ports[port]['state'] = GPIO.input(port)
        ledState = getGpioState()
 
        gpioState = {
                'leds' : ledState
        }
 
        return render_template('main.html', **gpioState)
 
@app.route("/<led>/<act>")
def action(led, act):
        led = int(led)
        leds = getGpioState()
        dev = leds[led]['name']
 
        if act == "on":
                GPIO.output(led, GPIO.HIGH)
                msg = dev + "를 켭니다."
        elif act == "off":
                GPIO.output(led, GPIO.LOW)
                msg = dev + "를 끕니다."
        elif act == "toggle":
                GPIO.output(led, not GPIO.input(led))
                msg = "토글 " + dev + "."
        else:
                msg = "예기치 않은 동작입니다!"
 
#for port in ports:
#ports[port]['state'] = GPIO.input(port)
 
        leds = getGpioState()
 
        gpioState = {
                'msg' : msg,
                'leds' : leds
        }
 
        return render_template('main.html', **gpioState)
 
if __name__ == "__main__":
        app.run(host='0.0.0.0', port=80, debug=True)