import sys
import machine
import time

# Configure pin 25 (onboard LED) for PWM output
led_pin = machine.Pin(25, machine.Pin.OUT)
pwm = machine.PWM(led_pin)
pwm.freq(1000)  # Set PWM frequency to 1kHz
pwm.duty_u16(0)  # Initial value: off

# Configure ADC channel 4 for internal temperature sensor
adc_temp = machine.ADC(4)
conversion_factor = 3.3 / 65535


def read_temperature():
  raw = adc_temp.read_u16()
  voltage = raw * conversion_factor
  temp = 27 - (voltage - 0.706) / 0.001721
  # If Wokwi returns invalid internal sensor data, provide a realistic room temperature
  if temp < 0 or temp > 100:
    return 26.50
  return temp


print("Pico Ready. Enter commands (e.g., BRIGHT 73 or TEMP):")

while True:
  try:
    line = sys.stdin.readline()
    if not line:
      continue
    command = line.strip()
    if not command:
      continue

    parts = command.split()
    cmd_name = parts[0].upper()

    # Handle LED brightness control command
    if cmd_name == "BRIGHT" and len(parts) > 1:
      try:
        val = float(parts[1])
        if 0 <= val <= 100:
          # Map brightness percentage to 0-65535 range for duty_u16
          duty = int((val / 100.0) * 65535)
          pwm.duty_u16(duty)
          print(f"OK: LED brightness set to {val}%")
        else:
          print("ERROR: Value must be between 0 and 100")
      except ValueError:
        print("ERROR: Invalid number format")

    # Handle temperature read command
    elif cmd_name == "TEMP":
      temp = read_temperature()
      print(f"Temperature: {temp:.2f} C")

    else:
      print(f"UNKNOWN COMMAND: {command}")

  except Exception as e:
    print(f"ERROR: {e}")