MikrofonSensor und TemperaturSenor die zwei Python programme funktionieren. mit den jeweiligen 2 json Datein. Beim TemperaturSensor wird im Terminal keine Wertre ausgegeben aber in der json Datei kann man die Temp und Hum sehen.
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Chiara
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# SPDX-FileCopyrightText: 2021 Melissa LeBlanc-Williams for Adafruit Industries
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#
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# SPDX-License-Identifier: MIT
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"""
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Much code from https://github.com/vsergeev/python-periphery/blob/master/periphery/pwm.py
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Copyright (c) 2015-2016 vsergeev / Ivan (Vanya) A. Sergeev
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License: MIT
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"""
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import os
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from time import sleep
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from errno import EACCES
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try:
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from microcontroller.pin import pwmOuts
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except ImportError:
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raise RuntimeError("No PWM outputs defined for this board.") from ImportError
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# pylint: disable=unnecessary-pass, too-many-instance-attributes
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class PWMError(IOError):
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"""Base class for PWM errors."""
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pass
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# pylint: enable=unnecessary-pass
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class PWMOut:
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"""Pulse Width Modulation Output Class"""
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# Number of retries to check for successful PWM export on open
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PWM_STAT_RETRIES = 10
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# Delay between check for successful PWM export on open (100ms)
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PWM_STAT_DELAY = 0.1
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# Sysfs paths
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_chip_path = "pwmchip{}"
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_channel_path = "pwm{}"
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def __init__(self, pwm, *, frequency=500, duty_cycle=0, variable_frequency=False):
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"""Instantiate a PWM object and open the sysfs PWM corresponding to the
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specified chip and channel.
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Args:
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pwm (str): PWM pin.
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frequency (int, float): target frequency in Hertz (32-bit).
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duty_cycle (int, float): The fraction of each pulse which is high (16-bit).
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variable_frequency (bool): True if the frequency will change over time.
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Returns:
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PWM: PWM object.
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Raises:
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PWMError: if an I/O or OS error occurs.
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TypeError: if `chip` or `channel` types are invalid.
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LookupError: if PWM chip does not exist.
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TimeoutError: if waiting for PWM export times out.
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"""
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self._chip = None
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self._channel = None
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self._period_ns = 0
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self._open(pwm, frequency, duty_cycle, variable_frequency)
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def __del__(self):
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self.close()
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def __enter__(self):
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return self
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def __exit__(self, exc_type, exc_val, exc_tb):
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self.close()
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def _open(self, pwm, frequency, duty_cycle, variable_frequency):
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for pwmout in pwmOuts:
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if pwmout[1] == pwm:
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self._chip = pwmout[0][0]
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self._channel = pwmout[0][1]
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self._chip_path = os.path.join(
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"/sys/class/pwm", self._chip_path.format(self._chip)
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)
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self._channel_path = os.path.join(
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self._chip_path, self._channel_path.format(self._channel)
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)
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if variable_frequency:
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print("Variable Frequency is not supported, continuing without it...")
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if not os.path.isdir(self._chip_path):
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raise LookupError("Opening PWM: PWM chip {} not found.".format(self._chip))
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if not os.path.isdir(self._channel_path):
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# Exporting the PWM.
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try:
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with open(
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os.path.join(self._chip_path, "export"), "w", encoding="utf-8"
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) as f_export:
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f_export.write("{:d}\n".format(self._channel))
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except IOError as e:
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raise PWMError(
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e.errno, "Exporting PWM channel: " + e.strerror
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) from IOError
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# Loop until PWM is exported
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exported = False
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for i in range(PWMOut.PWM_STAT_RETRIES):
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if os.path.isdir(self._channel_path):
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exported = True
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break
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sleep(PWMOut.PWM_STAT_DELAY)
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if not exported:
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raise TimeoutError(
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'Exporting PWM: waiting for "{:s}" timed out.'.format(
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self._channel_path
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)
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)
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# Loop until 'period' is writable, This could take some time after
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# export as application of the udev rules after export is asynchronous.
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# Without this loop, the following properties may not be writable yet.
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for i in range(PWMOut.PWM_STAT_RETRIES):
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try:
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with open(
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os.path.join(self._channel_path, "period"),
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"w",
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encoding="utf-8",
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):
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break
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except IOError as e:
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if e.errno != EACCES or (
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e.errno == EACCES and i == PWMOut.PWM_STAT_RETRIES - 1
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):
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raise PWMError(
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e.errno, "Opening PWM period: " + e.strerror
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) from IOError
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sleep(PWMOut.PWM_STAT_DELAY)
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self.frequency = frequency
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self.duty_cycle = duty_cycle
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self.polarity = "normal"
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self.enable()
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# Cache the period for fast duty cycle updates
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self._period_ns = self._get_period_ns()
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def close(self):
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"""Close the PWM."""
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if self._channel is not None:
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# Unexporting the PWM channel
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try:
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unexport_fd = os.open(
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os.path.join(self._chip_path, "unexport"), os.O_WRONLY
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)
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os.write(unexport_fd, "{:d}\n".format(self._channel).encode())
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os.close(unexport_fd)
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except OSError as e:
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raise PWMError(e.errno, "Unexporting PWM: " + e.strerror) from OSError
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self._chip = None
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self._channel = None
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def _write_channel_attr(self, attr, value):
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with open(
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os.path.join(self._channel_path, attr), "w", encoding="utf-8"
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) as f_attr:
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f_attr.write(value + "\n")
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def _read_channel_attr(self, attr):
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with open(
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os.path.join(self._channel_path, attr), "r", encoding="utf-8"
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) as f_attr:
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return f_attr.read().strip()
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# Methods
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def enable(self):
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"""Enable the PWM output."""
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self.enabled = True
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def disable(self):
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"""Disable the PWM output."""
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self.enabled = False
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# Mutable properties
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def _get_period(self):
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return float(self.period_ms) / 1000
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def _set_period(self, period):
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if not isinstance(period, (int, float)):
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raise TypeError("Invalid period type, should be int.")
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self.period_ms = int(period * 1000)
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period = property(_get_period, _set_period)
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"""Get or set the PWM's output period in seconds.
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Raises:
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PWMError: if an I/O or OS error occurs.
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TypeError: if value type is not int.
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:type: int, float
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"""
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def _get_period_ms(self):
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return self.period_us / 1000
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def _set_period_ms(self, period_ms):
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if not isinstance(period_ms, (int, float)):
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raise TypeError("Invalid period type, should be int or float.")
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self.period_us = int(period_ms * 1000)
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period_ms = property(_get_period_ms, _set_period_ms)
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"""Get or set the PWM's output period in milliseconds.
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Raises:
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PWMError: if an I/O or OS error occurs.
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TypeError: if value type is not int.
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:type: int, float
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"""
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def _get_period_us(self):
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return self.period_ns / 1000
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def _set_period_us(self, period_us):
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if not isinstance(period_us, int):
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raise TypeError("Invalid period type, should be int.")
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self.period_ns = int(period_us * 1000)
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period_us = property(_get_period_us, _set_period_us)
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"""Get or set the PWM's output period in microseconds.
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Raises:
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PWMError: if an I/O or OS error occurs.
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TypeError: if value type is not int.
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:type: int
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"""
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def _get_period_ns(self):
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period_ns = self._read_channel_attr("period")
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try:
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period_ns = int(period_ns)
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except ValueError:
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raise PWMError(
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None, 'Unknown period value: "%s".' % period_ns
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) from ValueError
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self._period_ns = period_ns
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return period_ns
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def _set_period_ns(self, period_ns):
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if not isinstance(period_ns, int):
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raise TypeError("Invalid period type, should be int.")
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self._write_channel_attr("period", str(period_ns))
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# Update our cached period
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self._period_ns = period_ns
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period_ns = property(_get_period_ns, _set_period_ns)
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"""Get or set the PWM's output period in nanoseconds.
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Raises:
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PWMError: if an I/O or OS error occurs.
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TypeError: if value type is not int.
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:type: int
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"""
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def _get_duty_cycle_ns(self):
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duty_cycle_ns_str = self._read_channel_attr("duty_cycle")
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try:
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duty_cycle_ns = int(duty_cycle_ns_str)
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except ValueError:
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raise PWMError(
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None, 'Unknown duty cycle value: "{:s}"'.format(duty_cycle_ns_str)
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) from ValueError
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return duty_cycle_ns
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def _set_duty_cycle_ns(self, duty_cycle_ns):
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if not isinstance(duty_cycle_ns, int):
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raise TypeError("Invalid duty cycle type, should be int.")
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self._write_channel_attr("duty_cycle", str(duty_cycle_ns))
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duty_cycle_ns = property(_get_duty_cycle_ns, _set_duty_cycle_ns)
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"""Get or set the PWM's output duty cycle in nanoseconds.
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Raises:
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PWMError: if an I/O or OS error occurs.
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TypeError: if value type is not int.
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:type: int
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"""
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def _get_duty_cycle(self):
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return float(self.duty_cycle_ns) / self._period_ns
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def _set_duty_cycle(self, duty_cycle):
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if not isinstance(duty_cycle, (int, float)):
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raise TypeError("Invalid duty cycle type, should be int or float.")
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if not 0.0 <= duty_cycle <= 1.0:
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raise ValueError("Invalid duty cycle value, should be between 0.0 and 1.0.")
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# Convert duty cycle from ratio to nanoseconds
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self.duty_cycle_ns = int(duty_cycle * self._period_ns)
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duty_cycle = property(_get_duty_cycle, _set_duty_cycle)
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"""Get or set the PWM's output duty cycle as a ratio from 0.0 to 1.0.
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Raises:
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PWMError: if an I/O or OS error occurs.
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TypeError: if value type is not int or float.
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ValueError: if value is out of bounds of 0.0 to 1.0.
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:type: int, float
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"""
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def _get_frequency(self):
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return 1.0 / self.period
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def _set_frequency(self, frequency):
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if not isinstance(frequency, (int, float)):
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raise TypeError("Invalid frequency type, should be int or float.")
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self.period = 1.0 / frequency
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frequency = property(_get_frequency, _set_frequency)
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"""Get or set the PWM's output frequency in Hertz.
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Raises:
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PWMError: if an I/O or OS error occurs.
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TypeError: if value type is not int or float.
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:type: int, float
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"""
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def _get_polarity(self):
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return self._read_channel_attr("polarity")
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def _set_polarity(self, polarity):
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if not isinstance(polarity, str):
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raise TypeError("Invalid polarity type, should be str.")
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if polarity.lower() not in ["normal", "inversed"]:
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raise ValueError('Invalid polarity, can be: "normal" or "inversed".')
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self._write_channel_attr("polarity", polarity.lower())
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polarity = property(_get_polarity, _set_polarity)
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"""Get or set the PWM's output polarity. Can be "normal" or "inversed".
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Raises:
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PWMError: if an I/O or OS error occurs.
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TypeError: if value type is not str.
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ValueError: if value is invalid.
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:type: str
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"""
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def _get_enabled(self):
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enabled = self._read_channel_attr("enable")
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if enabled == "1":
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return True
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if enabled == "0":
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return False
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raise PWMError(None, 'Unknown enabled value: "{:s}"'.format(enabled))
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def _set_enabled(self, value):
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if not isinstance(value, bool):
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raise TypeError("Invalid enabled type, should be bool.")
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self._write_channel_attr("enable", "1" if value else "0")
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enabled = property(_get_enabled, _set_enabled)
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"""Get or set the PWM's output enabled state.
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Raises:
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PWMError: if an I/O or OS error occurs.
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TypeError: if value type is not bool.
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:type: bool
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"""
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# String representation
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def __str__(self):
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return (
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"PWM {:d}, chip {:d} (period={:f} sec, duty_cycle={:f}%,"
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" polarity={:s}, enabled={:s})".format(
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self._channel,
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self._chip,
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self.period,
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self.duty_cycle * 100,
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self.polarity,
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str(self.enabled),
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)
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)
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