74 lines
2.0 KiB
Python
74 lines
2.0 KiB
Python
import utime
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from machine import Pin
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class MTS102:
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"""MTS102（三脚二档钮子开关）"""
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def __init__(self, pin, pull_down=False):
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"""
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:param pin: 引脚编号
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:param pull_down: 引脚下拉电阻（断开为低电平，接通为高电平），默认为False。若使用下拉电阻，因钮子接通后断开可能存留电荷/漏电故需在引脚和GND并联1K～10K欧电阻
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"""
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if not isinstance(pull_down, bool):
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raise TypeError("pull_down数据类型应为布尔")
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self.pull_down = pull_down
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# 尝试初始化引脚
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try:
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self.pin = Pin(
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pin, Pin.IN, Pin.PULL_DOWN if self.pull_down else Pin.PULL_UP
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)
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except Exception as exception:
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raise RuntimeError(f"初始化引脚发生异常，{str(exception)}") from exception
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# 初始化上一次检测时间
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self._last_time = utime.ticks_ms()
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# 初始化上一次检测状态
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self._last_state = self._get_state()
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def _get_state(self):
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"""获取状态：0为断开，1为接通"""
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return self.pin.value() ^ (not self.pull_down)
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def _debounce(self):
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"""去抖"""
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current_time = utime.ticks_ms()
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current_state = self._get_state()
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# 若当前与上一次检测间隔大于等于防抖时间则更新时间，又若状态不同则更新状态
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if utime.ticks_diff(current_time, self._last_time) >= 20:
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if current_state != self._last_state:
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self._last_time = current_time
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self._last_state = current_state
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return self._last_state
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@property
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def switched(self):
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"""是否接通"""
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return self._debounce() == 1
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"""
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使用示例
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引脚0→LED→220R→GND
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引脚1→MTS102→GND
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import utime
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from machine import Pin
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from utils.switch import MTS102
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led = Pin(0, Pin.OUT)
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toggle = MTS102(pin=1)
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while True:
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if toggle.switched:
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led.on()
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else:
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led.off()
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utime.sleep_ms(200)
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""" |