# 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,PWM
from time import sleep
from dht import DHT22
from machine import I2C, Pin

from pico_i2c_lcd import I2cLcd
toneA = 440
toneB = 494
toneC = 523
toneD = 587
toneE = 659
toneF = 698
toneG = 784


tones = [toneA, toneB, toneC, toneD, toneE, toneF, toneG]


def play_buzzer_and_sleep(freq, duration_ms, duty_value=512):
    buzzer= PWM(Pin(26))
    buzzer.freq(freq)
    buzzer.duty_u16(duty_value)
    sleep(duration_ms)
    buzzer.duty_u16(0)
    
def buzzerFunc():
    buzzer= PWM(Pin(26))
    buzzer.freq(500)
    buzzer.duty_u16(1000)
    sleep(1)
    buzzer.duty_u16(0)

# creating a DHT object
# change DHT22 to DHT11 if DHT11 is used
dht = DHT22(Pin(22)) 
i2c = I2C(0, sda=Pin(0), scl=Pin(1), freq=400000)

# getting I2C address
I2C_ADDR = i2c.scan()[0]

# creating an LCD object using the I2C address and specifying number of rows and columns in the LCD
# LCD number of rows = 2, number of columns = 16
lcd = I2cLcd(i2c, I2C_ADDR, 2, 16)

RELAY_CTRL_PIN =  28
relay = Pin(RELAY_CTRL_PIN, Pin.OUT)

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

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

    lcd.move_to(1,0)
    lcd.putstr(f"Suhu  :{temp} C")
    lcd.move_to(1,1)
    lcd.putstr(f"Humty :{hum} %")
  
    sleep(5)        # "Hello world!" text would be displayed for 5 secs
    lcd.clear()
    sleep(0.2)        # clear the text for 1 sec then print the text again
    
    # format method or string concatenation may also be used
    #print("Temperature: {}°C   Humidity: {:.0f}% ".format(temp, hum))
    #print("Temperature: " + str(temp) + "°C" + "   Humidity: " + str(hum) + "%")
    
    # delay of 2 secs because DHT22 takes a reading once every 2 secs
    sleep(1)
    if(temp > 28 or hum > 30):
        relay.high()
        buzzerFunc()

    else:
        relay.low()
        None