from machine import Pin
import time

IR_PIN = 15  # GPIO pin connected to IR OUT

ir = Pin(IR_PIN, Pin.IN, Pin.PULL_UP)

# NEC timing (microseconds)
START_LOW = 9000
START_HIGH = 4500
BIT_LOW = 560
BIT_HIGH_0 = 560
BIT_HIGH_1 = 1690

pulse_times = []
last_time = 0
receiving = False


def ir_callback(pin):
    global last_time, pulse_times, receiving

    now = time.ticks_us()
    duration = time.ticks_diff(now, last_time)
    last_time = now

    if duration > 10000:
        # New frame
        pulse_times = []
        receiving = True
    else:
        if receiving:
            pulse_times.append(duration)


ir.irq(trigger=Pin.IRQ_FALLING | Pin.IRQ_RISING, handler=ir_callback)


def decode_nec(pulses):
    if len(pulses) < 66:
        return None

    data = 0
    index = 0

    # Skip start pulses
    index += 2

    for i in range(32):
        low = pulses[index]
        high = pulses[index + 1]
        index += 2

        if high > 1000:
            data |= (1 << i)

    return data


print("📡 IR Receiver Ready... Press any remote button")

while True:
    if receiving and len(pulse_times) > 66:
        receiving = False
        code = decode_nec(pulse_times)
        if code:
            print("IR Code (HEX):", hex(code))
        pulse_times = []
    time.sleep_ms(100)