#from lcd_library import LCD
from lcd import LCD1602
from machine import Pin,PWM
import dht
from time import sleep

ht=dht.DHT22(Pin(16)) # Assign/define temp & humid pin number
RC1_pin=Pin(26,Pin.OUT) # Assign relay pin number (R1_coil1_P1) for Ex.fan1
RC2_pin=Pin(25,Pin.OUT) # Assign relay pin number (R1_coil2_P2) for Ex.fan2
SL_pin=Pin(32,Pin.OUT) # Assign stroke light for operator awareness
Buzzer_pin=PWM(Pin(27)) # Assign buzzer pin number for operator awareness
print (Buzzer_pin) 
TAH = 35 # Temperature alarm Hi in Celsius
TAHH= 45 # Temperature alarm HiHi in Celsius
HTH = 60 # Humidity alarm Hi in %
HTHH= 70 # Humidity alarm HiHi in %
Temp_Threshold= Humid_Threshold= 70 # for operator awareness if fan fails to run

# Initialize LCD with GPIO pins (modify for ESP32 if needed)
lcd=LCD1602(rs=4,en=5,d4=12,d5=13,d6=14,d7=15)

# To display real time temperature and humidity
last_temp=None
last_humid=None

# Function to blink the LED
def blink_SL_pin(interval=0.25):
    SL_pin.on()
    sleep(interval)
    SL_pin.off()
    sleep(interval)

while True:

    ht.measure()
    temp=ht.temperature()
    humid=ht.humidity()
    print(temp)
    print(humid)

    #Output the unit in "C" & "%"
    print(f"Temp: {temp} °C")
    print(f"Humid: {humid} %")

    if temp != last_temp or humid != last_humid:
        lcd.clear()                      

        lcd.set_cursor(0,0)
        lcd.putstr(f"Temp: {temp:.1f} C")

        lcd.set_cursor(1,0)
        lcd.putstr(f"Hum: {humid:.1f} %")

        last_temp=temp
        last_humid=humid
    
    if temp >= TAH or humid >= HTH:
        RC1_pin.value(1)
    else:
        RC1_pin.value(0)
    
    if temp >= TAHH or humid >= HTHH:
        RC2_pin.value(1)
    else:
        RC2_pin.value(0)

    if temp >= Temp_Threshold or humid >= Humid_Threshold:
        blink_SL_pin()
        Buzzer_pin.freq(2000)
    else:
        SL_pin.off()
        Buzzer_pin.freq(1)

sleep(2)