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#!/usr/bin/python
# -*- coding: UTF-8 -*-

import serial, time, struct, csv
from datetime import datetime as DateTime

ser = serial.Serial()
ser.port = "/dev/feinstaub"
ser.baudrate = 9600

ser.open()
ser.flushInput()

byte, lastbyte = "\x00", "\x00"

#STRINGS
OUTPUT_FILENAME = "/home/pi/Documents/Feinstaubdaten/Feinstaubdaten{:%Y%m%d_%H%M%S}.csv"
Name = ["Feinstaubsensor"]
Beschriftung = ["Datum","Uhrzeit","PM2.5","PM10"]
Datum = "{:%Y:%m:%d}"
Uhrzeit = "{:%H:%M:%S}"

while True:
    lastbyte = byte
    byte = ser.read(size=1)
    
    if lastbyte == "\xAA" and byte == "\xC0":
        sentence = ser.read(size=9)
        readings = struct.unpack('<HHxxBBB',sentence)

        
        pm_25 = readings[0]/10.0
        pm_10 = readings[1]/10.0

        with open(OUTPUT_FILENAME.format(DateTime.now()), 'a') as csvfile:
            output = csv.writer(csvfile, delimiter=';', escapechar=' ', quoting=csv.QUOTE_NONE)
            output.writerow(Name)
            output.writerow(Beschriftung)
            output.writerow([Datum.format(DateTime.now()), Uhrzeit.format(DateTime.now()), pm_25, pm_10])
        
        time.sleep(5)

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a = tuwas()
print(a, a, a, a,)

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from datetime import datetime

now = datetime.now().strftime("%Y-%m-%d;%H:%M:%S")
Datum, Uhrzeit = now.split(";")