sensordata.py

#!/usr/bin/python
import RPi.GPIO as GPIO
import time
import random

# Connect the dht11 to GPIO port 2
channel = 2

# Get all sensor data, and return sensordata['temp'],['mois'],['light']
def getSensor():
    data = []
    j = 0
    GPIO.setmode(GPIO.BCM)
    time.sleep(1)
    GPIO.setup(channel, GPIO.OUT)
    GPIO.output(channel, GPIO.LOW)
    time.sleep(0.02)
    GPIO.output(channel, GPIO.HIGH)
    GPIO.setup(channel, GPIO.IN)
    while GPIO.input(channel) == GPIO.LOW:
        continue
    while GPIO.input(channel) == GPIO.HIGH:
        continue
    while j < 40:
        k = 0
        while GPIO.input(channel) == GPIO.LOW:
            continue
        while GPIO.input(channel) == GPIO.HIGH:
            k += 1
            if k > 100:
                break
        if k < 8:
            data.append(0)
        else:
            data.append(1)
        j += 1
    print "sensor is working."
    print data

    humidity_bit = data[0:8]
    humidity_point_bit = data[8:16]
    temperature_bit = data[16:24]
    temperature_point_bit = data[24:32]
    check_bit = data[32:40]
    humidity = 0
    humidity_point = 0
    temperature = 0
    temperature_point = 0
    check = 0
    for i in range(8):
        humidity += humidity_bit[i] * 2 ** (7-i)
        humidity_point += humidity_point_bit[i] * 2 ** (7-i)
        temperature += temperature_bit[i] * 2 ** (7-i)
        temperature_point += temperature_point_bit[i] * 2 ** (7-i)
        check += check_bit[i] * 2 ** (7-i)
    tmp = humidity + humidity_point + temperature + temperature_point
    if check == tmp:
        print "temperature :", temperature, "*C, humidity :", humidity, "%"
    else:
        print "wrong"
        print "temperature :", temperature, "*C, humidity :", humidity, "% check :", check, ", tmp :", tmp
    GPIO.cleanup()
    
    sensordata = {}
    try:
        sensordata["temp"] = temperature
        sensordata["mois"] = humidity
        # Mock light data
        sensordata["light"] = random.randint(0,700)
        time.sleep(.5)
        GPIO.cleanup()
        return sensordata

    except KeyboardInterrupt:
        print ("Test by Mock","KeyboardInterrupt!")
    except TypeError:
        print ("Please power off your raspberry3, and start it again!")
        print ("Raspberry3 overcurrent")
    except IOError:
        print ("Error")