#!/usr/bin/env python3
# -*- coding: utf-8 -*-

import Adafruit_BMP.BMP085 as BMP085
import Adafruit_DHT
import sys, time

# constants
DHT_PIN = 23                    # GPIO nr
DHT_SENSOR = Adafruit_DHT.DHT22     

if __name__ == '__main__':
    if len(sys.argv) > 1:
        call = sys.argv[1].lower()

        if call == 'temperature':
            temperature = None
            while temperature == None:
               _, temperature = Adafruit_DHT.read_retry(DHT_SENSOR, DHT_PIN)
               if temperature == None:
                   time.sleep(1.5)
            print(temperature)

        elif call == 'humidity':
            humidity = None
            while humidity == None:
               humidity, _ = Adafruit_DHT.read_retry(DHT_SENSOR, DHT_PIN)
               if humidity == None:
                   time.sleep(1.5)
            print(humidity)
            
        elif call == 'pressure':
            sensor = BMP085.BMP085()
            print(sensor.read_pressure() / 100.0)