from machine import Pin, ADC
import time

# Pin setup for LEDs
RED_LED_PIN = 17         # Red LED
YELLOW_LED_PIN = 16      # Yellow LED
GREEN_LED_PIN = 15       # Green LED

# Pin setup for the temperature sensor
TEMP_SENSOR_PIN = 26     # Analog temperature sensor input pin (GPIO 26)

# Setup the pins for LEDs
red_led = Pin(RED_LED_PIN, Pin.OUT)
yellow_led = Pin(YELLOW_LED_PIN, Pin.OUT)
green_led = Pin(GREEN_LED_PIN, Pin.OUT)

# Setup the temperature sensor (using ADC)
temp_sensor = ADC(Pin(TEMP_SENSOR_PIN))  # Correct ADC setup

# Function to convert the analog value to temperature (for LM35)
def read_temperature():
    # Read analog value (0-65535) and convert it to voltage
    adc_value = temp_sensor.read_u16()  # Use read_u16() for Pico
    voltage = adc_value * (3.3 / 65535)  # Convert ADC value to voltage (3.3V reference)
    temperature_c = voltage * 100  # LM35 gives 10mV per °C, so multiply by 100
    return adc_value, temperature_c  # Return both the ADC value and the temperature for debugging

def main():
    while True:
        # Read the current temperature and the raw ADC value
        adc_value, temperature = read_temperature()
        
        # Debug: print the raw ADC value and the temperature to monitor the values
        print(f"ADC Value: {adc_value}, Temperature: {temperature}°C")
        
        # Turn off all LEDs initially
        red_led.value(0)
        yellow_led.value(0)
        green_led.value(0)
        
        # Check temperature and control LEDs
        if temperature > 27:
            print("Temperature above 27°C - Red LED ON")
            red_led.value(1)  # Turn on the Red LED
        elif 21 <= temperature <= 27:
            print("Temperature between 21°C and 27°C - Yellow LED ON")
            yellow_led.value(1)  # Turn on the Yellow LED
        elif temperature < 21:
            print("Temperature below 21°C - Green LED ON")
            green_led.value(1)  # Turn on the Green LED
        else:
            print("Temperature out of expected range!")  # This should never occur
        
        time.sleep(1)  # Delay for 1 second

if __name__ == "__main__":
    main()