from machine import ADC, Pin
from time import sleep
import math
import functions

# Pin and constant definitions
ADC_Pin = ADC(26)
Led_red = Pin(28, Pin.OUT)
Led_Blue = Pin(27, Pin.OUT)
interrupt_btn = Pin(16, Pin.IN, Pin.PULL_UP)
# Const For NTC
NTC_BETA = 3950  # Beta value of the thermistor
NTC_R0 = 10000  # Resistance at 25°C
NTC_T0 = 298.15  # Temperature at 25°C in Kelvin

# Functions defnitions
btn_pressed = False

def read_analogue_voltage(pin):
    global btn_pressed
    btn_pressed = True
interrupt_btn.irq(trigger=Pin.IRQ_FALLING, handler=read_analogue_voltage)

def read_ntc():
    # Read the analog value from the NTC pin
    adc_value = ADC_Pin.read_u16()
    
    # Convert the analog value to a resistance
    resistance = (adc_value / 65535.0) * 10000
    
    # Calculate the temperature using the Steinhart-Hart equation
    t = 1 / (1 / NTC_T0 + math.log(resistance / NTC_R0) / NTC_BETA)
    t_celsius = t - 273  # Convert to Celsius
    
    return t_celsius

adc_value = ADC_Pin.read_u16()

def main():
    freq = functions.convert_to_frequency(adc_value) * -1
    filterd_freq = functions.low_pass_filter(freq)
    while True:
        global btn_pressed
        if btn_pressed is True:
            btn_pressed = False
            temperature = read_ntc()
            print("Temperature: {:.1f}°C".format(temperature))
            if temperature >= 55:
                Led_red.on()
                Led_Blue.off()
                functions.buzz_frequency(filterd_freq)
            else:
                Led_Blue.on()
                Led_red.off()
                functions.buzz_frequency(0)
        sleep(0.2)
    

if __name__ == '__main__':
    main()