from machine import Pin, time_pulse_us
import time

# Define pins
TRIG = Pin(4, Pin.OUT)
ECHO = Pin(5, Pin.IN)
PIR = Pin(14, Pin.IN)
LED = Pin(13, Pin.OUT)

def get_distance():
    # Trigger the ultrasonic burst
    TRIG.off()
    time.sleep_us(2)
    TRIG.on()
    time.sleep_us(10)
    TRIG.off()
    
    # Measure the echo duration
    duration = time_pulse_us(ECHO, 1, 30000)  # 30ms timeout
    distance_cm = (duration / 2) / 29.1  # Convert to cm
    return distance_cm

while True:
    distance = get_distance()
    motion = PIR.value()  # 1 = motion detected, 0 = no motion
    
    print("Distance:", distance, "cm | Motion:", motion)
    
    # Combine both conditions
    if distance < 50 and motion == 1:
        LED.on()
        print("Doorbell ON - Someone is at the door!")
    else:
        LED.off()
    
    time.sleep(0.5)