from machine import Pin
from utime import sleep_ms

# Pin configuration for NTC temperature sensor
ntc_pin = Pin(26, Pin.IN)

# Pin configuration for LEDs
red_led_pin = Pin(5, Pin.OUT)
blue_led_pin = Pin(4, Pin.OUT)

def read_temperature():
    # Read analog value from NTC sensor
    sensor_value = ntc_pin.read_u16()

    # Convert analog value to temperature using NTC resistance-temperature curve
    # Replace the coefficients with values specific to your NTC sensor
    resistance = 10000.0 / ((65535.0 / sensor_value) - 1)
    temperature = 1 / ((resistance / 10000.0) / 3950.0 + 1.0 / 298.15) - 273.15

    return temperature

def blink_led(pin):
    # Blink the LED connected to the specified pin
    pin.toggle()
    sleep_ms(1000)
    pin.toggle()
    sleep_ms(1000)

while True:
    # Read temperature from NTC sensor
    temperature = read_temperature()

    # Print data to serial terminal
    print("Temperature: {:.2f} °C".format(temperature))

    # Check temperature conditions and control red LED
    if 20 < temperature < 40:
        blink_led(red_led_pin)

    # Wait for 3 minutes
    sleep_ms(180000)