# Project objectives: 
#   Read temperature and humidity values from the DHT22 sensor
#   Display the sensor readings in the console
#
# Hardware connections used:
#   DHT22 VCC Pin to 3.3V
#   DHT22 SDA Pin to GPIO Pin 15
#   10k ohm pull-up resistor from DHT22 SDA Pin to 3.3V
#   DHT22 GND Pin to GND
#
# Programmer: Adrian Josele G. Quional

# modules
from machine import Pin
from time import sleep
from dht import DHT22   # if the sensor is DHT11, import DHT11 instead of DHT22
from enum import Enum
import config


states = Enum ["CLOSED", "OPENED"];
shuttersState = state.0;

# creating a DHT object
# change DHT22 to DHT11 if DHT11 is used
dht = DHT22(Pin(15)) 

# continuously get sensor readings while the board has power
while True:
    
    # getting sensor readings
    dht.measure()
    temp = dht.temperature()
    hum = dht.humidity()

    print(config.CLOSE_SHUTTERS_TEMP);

    print(config.OPEN_SHUTTERS_TEMP);

    print("end test");

    # displaying values to the console
    print(f"Temperature: {temp}°C   Humidity: {hum}% ");

    if temp <= config.OPEN_SHUTTERS_TEMP:
        switchShuttersState(1);
    elif temp >= config.OPEN_SHUTTERS_TEMP:
        switchShuttersState(0);
    
    # delay of 2 secs because DHT22 takes a reading once every 2 secs
    sleep(2)

# 0 = CLOSE; 1 = OPEN
def switchShuttersState (signal):

    shuttersState = (shuttersState == states.signal) ? shuttersState : states.signal;

    print("Shutters are {shuttersState}!");