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airpollution.py
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airpollution.py
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#!/usr/bin/env python3
import RPi.GPIO as GPIO
import time
import Freenove_DHT as DHT
from PCF8574 import PCF8574_GPIO
from Adafruit_LCD1602 import Adafruit_CharLCD
from time import sleep, strftime
from datetime import datetime
import captureimage
from naive_bayes import names
DHTPin = 11 #define the pin of DHT11
def rules(temp, hum, vis):
if temp < 30 and hum >= 50 and vis == 'notclear':
lcd.message('Cloudy - Fog')
elif temp >= 30 and hum < 50 and vis == 'clear':
lcd.message('Hot and Dry')
elif temp >= 30 and hum >= 50 and vis == 'clear':
lcd.message('Hot and Humid')
elif temp < 30 and hum < 50 and vis == 'clear':
lcd.message('Cold and Dry')
elif temp >= 30 and hum >= 50 and vis == 'notclear':
lcd.message('Humid - Fog')
elif temp < 30 and hum < 50 and vis == 'notclear':
lcd.message('Smog - Air Pol.')
elif temp >= 30 and hum < 50 and vis == 'notclear':
lcd.message('Smog - Air Pol.')
elif temp < 30 and hum >= 50 and vis == 'clear':
lcd.message('Cold and Windy')
else:
lcd.message("Data Error")
def getvisibility(i):
visibility = names[i] #import results from Naive Bayes classifier
return visibility
def loop():
dht = DHT.DHT(DHTPin) #create a DHT class object
mcp.output(3,1) # turn on LCD backlight
lcd.begin(16,2) # set number of LCD lines and columns
counts = 0 # Measurement counts
while(True):
counts += 1
vis = getvisibility(-1)
print("Measurement counts: ", counts)
for i in range(0,15):
chk = dht.readDHT11() #Read DHT11
if (chk is dht.DHTLIB_OK): #Determine whether data read from DHT11 is normal according to the return value.
print("DHT11,OK!")
break
time.sleep(0.1)
print("Humidity : %.2f, \t Temperature : %.2f \n"%(dht.humidity,dht.temperature))
print("Visibility : " + vis)
hum = '{:.0f}'.format( float(dht.humidity))
temp = '{:.0f}'.format( float(dht.temperature))
#lcd.clear()
lcd.setCursor(0,0) # set cursor position
lcd.message('Vis : ' + vis + '\n') # display the visibility
lcd.message('Hum:' + hum + ' Temp:' + temp )# display the humidity
time.sleep(3)
lcd.clear()
rules(int(temp), int(hum), vis)
time.sleep(3)
def destroy():
lcd.clear()
PCF8574_address = 0x27 # I2C address of the PCF8574 chip.
PCF8574A_address = 0x3F # I2C address of the PCF8574A chip.
# Create PCF8574 GPIO adapter.
try:
mcp = PCF8574_GPIO(PCF8574_address)
except:
try:
mcp = PCF8574_GPIO(PCF8574A_address)
except:
print ('I2C Address Error !')
exit(1)
# Create LCD, passing in MCP GPIO adapter.
lcd = Adafruit_CharLCD(pin_rs=0, pin_e=2, pins_db=[4,5,6,7], GPIO=mcp)
if __name__ == '__main__':
print ('Program is starting ... ')
try:
loop()
except KeyboardInterrupt:
GPIO.cleanup()
destroy()
exit()