##========================导入mq系列模块================##=
from machine import Pin, ADC
import time
from time import sleep
from mqx import MQX
from led_single_power import PowerLED



##=========================回调函数=======================
def mq_callback(voltage: float) -> None:
    """
    当比较器引脚触发中断时调用该函数，打印当前电压值。

    Args:
        voltage (float): 电压值 (单位: V)。

    Returns:
        None: 无返回值。

    Raises:
        None: 本函数不抛出异常。
    """
    state = comp.value()
    if state == 1:
        # 上升沿触发后的状态
        comp_warning = 1
    else:
        # 下降沿触发后的状态
        comp_warning = 0
    print("[IRQ] Voltage: {:.3f} V".format(voltage))
    

# 上电延时3s
time.sleep(3)

##=====================配置mq传感器=======================

# 打印调试消息
print("Measuring Gas Concentration with MQ Series Gas Sensor Modules")

# LED (GPIO,PWM)
led = PowerLED(pin=19, pwm_freq=1000)

# Pico ADC0 (GPIO26)
adc = ADC(Pin(26))

# Comparator output (GPIO15, optional)
comp = Pin(15, Pin.IN)
comp_warning = None
mq = MQX(adc, comp, mq_callback, rl_ohm=10000, vref=3.3,)

# 选择内置多项式（MQ2、MQ4、MQ7）
mq.select_builtin("MQ2")

##================主函数================

def main():
    print("===== MQ Sensor Test Program Started =====")
    try:
        while True:
            # 读取电压
            v = mq.read_voltage()
            print("Voltage: {:.3f} V".format(v))

            # 读取 ppm（5 次采样，间隔 200 ms）
            ppm = mq.read_ppm(samples=5, delay_ms=200)
            print("Gas concentration: {:.2f} ppm".format(ppm))

            print("-" * 40)

            # 主循环间隔
            sleep(2)
    except KeyboardInterrupt:
        print("User interrupted, exiting program...")
    finally:
        mq.deinit()
        print("Sensor resources released.")

if __name__ == "__main__":
    main()