ESP32（MicroPython） 电位器控制蜂鸣器频率

本程序通过读取电位器输出的电压并进行相应计算得出输出频率，并在数码管显示频率。本人实际上使用扬声器进行测试，根据测试情况，输出频率设置到10000Hz（理论频率）以内。提供非线性（频率与电压成反比）和线性（频率与电压成正比）两个版本。

非线性

'''

接线：CLK-->(16)

      DIO-->(17)

      ADC-->(34)

      蜂鸣器-->(22)

'''

#导入Pin模块

from machine import Pin

import time

import tm1637

from machine import ADC

from machine import Timer

#定义蜂鸣器控制对象

beep=Pin(22,Pin.OUT)

#定义ADC控制对象

adc=ADC(Pin(34))

adc.atten(ADC.ATTN_11DB)  #开启衰减，量程增大到3.3V

#定义数码管控制对象

smg=tm1637.TM1637(clk=Pin(16),dio=Pin(17))

#定时器0中断函数

def time0_irq(time0):

    adc_vol=200*adc.read()/4095+1

    i=0

    b=1

    a=round(10000/adc_vol)

    d=a/10

    c=0

    smg.show("%04d"%a)

    if 0<a<501 :

      b=a*2 #声音频率为开关频率的2倍

      b=round(1000/b) #频率换算为延时

      while True:

        i=not i  #非运算

        beep.value(i)  

        time.sleep_ms(b)

        c+=1

        if c>=d :

            break

    if 500<a<500001 :

      b=a*2

      b/=1000 #延时改用微秒

      b=round(1000/b)

      while True:

        i=not i  #非运算

        beep.value(i)  

        time.sleep_us(b)

        c+=1

        if c>=d :

            break

#程序入口

if __name__=="__main__":

   time0=Timer(0)  #创建time0定时器对象

   time0.init(period=50,mode=Timer.PERIODIC,callback=time0_irq)

   while True:

     pass

线性

'''

接线：CLK-->(16)

      DIO-->(17)

      ADC-->(34)

      蜂鸣器-->(22)

'''

#导入Pin模块

from machine import Pin

import time

import tm1637

from machine import ADC

from machine import Timer

#定义蜂鸣器控制对象

beep=Pin(22,Pin.OUT)

#定义ADC控制对象

adc=ADC(Pin(34))

adc.atten(ADC.ATTN_11DB)  #开启衰减，量程增大到3.3V

#定义数码管控制对象

smg=tm1637.TM1637(clk=Pin(16),dio=Pin(17))

#定时器0中断函数

def time0_irq(time0):

    a=9998*adc.read()//4095+1

    i=0

    b=1    

    d=a/10

    c=0

    smg.show("%04d"%a)

    if 0<a<501 :

      b=a*2 #声音频率为开关频率的2倍

      b=round(1000/b) #频率换算为延时

      while True:

        i=not i  #非运算

        beep.value(i)  

        time.sleep_ms(b)

        c+=1

        if c>=d :

            break

    if 500<a<500001 :

      b=a*2

      b/=1000 #延时改用微秒

      b=round(1000/b)

      while True:

        i=not i  #非运算

        beep.value(i)  

        time.sleep_us(b)

        c+=1

        if c>=d :

            break

#程序入口

if __name__=="__main__":

   time0=Timer(0)  #创建time0定时器对象

   time0.init(period=50,mode=Timer.PERIODIC,callback=time0_irq)

   while True:

     pass

数码管驱动

tm1367.py

"""

MicroPython TM1637 quad 7-segment LED display driver

https://github.com/mcauser/micropython-tm1637

MIT License

Copyright (c) 2016 Mike Causer

Permission is hereby granted, free of charge, to any person obtaining a copy

of this software and associated documentation files (the "Software"), to deal

in the Software without restriction, including without limitation the rights

to use, copy, modify, merge, publish, distribute, sublicense, and/or sell

copies of the Software, and to permit persons to whom the Software is

furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all

copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR

IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,

FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE

AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER

LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,

OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE

SOFTWARE.

"""

from micropython import const

from machine import Pin

from time import sleep_us, sleep_ms

TM1637_CMD1 = const(64)  # 0x40 data command

TM1637_CMD2 = const(192) # 0xC0 address command

TM1637_CMD3 = const(128) # 0x80 display control command

TM1637_DSP_ON = const(8) # 0x08 display on

TM1637_DELAY = const(10) # 10us delay between clk/dio pulses

TM1637_MSB = const(128)  # msb is the decimal point or the colon depending on your display

# 0-9, a-z, blank, dash, star

_SEGMENTS = bytearray(b'\x3F\x06\x5B\x4F\x66\x6D\x7D\x07\x7F\x6F\x77\x7C\x39\x5E\x79\x71\x3D\x76\x06\x1E\x76\x38\x55\x54\x3F\x73\x67\x50\x6D\x78\x3E\x1C\x2A\x76\x6E\x5B\x00\x40\x63')

class TM1637(object):

    """Library for quad 7-segment LED modules based on the TM1637 LED driver."""

    def __init__(self, clk, dio, brightness=7):

        self.clk = clk

        self.dio = dio

        if not 0 <= brightness <= 7:

            raise ValueError("Brightness out of range")

        self._brightness = brightness

        self.clk.init(Pin.OUT, value=0)

        self.dio.init(Pin.OUT, value=0)

        sleep_us(TM1637_DELAY)

        self._write_data_cmd()

        self._write_dsp_ctrl()

    def _start(self):

        self.dio(0)

        sleep_us(TM1637_DELAY)

        self.clk(0)

        sleep_us(TM1637_DELAY)

    def _stop(self):

        self.dio(0)

        sleep_us(TM1637_DELAY)

        self.clk(1)

        sleep_us(TM1637_DELAY)

        self.dio(1)

    def _write_data_cmd(self):

        # automatic address increment, normal mode

        self._start()

        self._write_byte(TM1637_CMD1)

        self._stop()

    def _write_dsp_ctrl(self):

        # display on, set brightness

        self._start()

        self._write_byte(TM1637_CMD3 | TM1637_DSP_ON | self._brightness)

        self._stop()

    def _write_byte(self, b):

        for i in range(8):

            self.dio((b >> i) & 1)

            sleep_us(TM1637_DELAY)

            self.clk(1)

            sleep_us(TM1637_DELAY)

            self.clk(0)

            sleep_us(TM1637_DELAY)

        self.clk(0)

        sleep_us(TM1637_DELAY)

        self.clk(1)

        sleep_us(TM1637_DELAY)

        self.clk(0)

        sleep_us(TM1637_DELAY)

    def brightness(self, val=None):

        """Set the display brightness 0-7."""

        # brightness 0 = 1/16th pulse width

        # brightness 7 = 14/16th pulse width

        if val is None:

            return self._brightness

        if not 0 <= val <= 7:

            raise ValueError("Brightness out of range")

        self._brightness = val

        self._write_data_cmd()

        self._write_dsp_ctrl()

    def write(self, segments, pos=0):

        """Display up to 6 segments moving right from a given position.

        The MSB in the 2nd segment controls the colon between the 2nd

        and 3rd segments."""

        if not 0 <= pos <= 5:

            raise ValueError("Position out of range")

        self._write_data_cmd()

        self._start()

        self._write_byte(TM1637_CMD2 | pos)

        for seg in segments:

            self._write_byte(seg)

        self._stop()

        self._write_dsp_ctrl()

    def encode_digit(self, digit):

        """Convert a character 0-9, a-f to a segment."""

        return _SEGMENTS[digit & 0x0f]

    def encode_string(self, string):

        """Convert an up to 4 character length string containing 0-9, a-z,

        space, dash, star to an array of segments, matching the length of the

        source string."""

        segments = bytearray(len(string))

        for i in range(len(string)):

            segments[i] = self.encode_char(string[i])

        return segments

    def encode_char(self, char):

        """Convert a character 0-9, a-z, space, dash or star to a segment."""

        o = ord(char)

        if o == 32:

            return _SEGMENTS[36] # space

        if o == 42:

            return _SEGMENTS[38] # star/degrees

        if o == 45:

            return _SEGMENTS[37] # dash

        if o >= 65 and o <= 90:

            return _SEGMENTS[o-55] # uppercase A-Z

        if o >= 97 and o <= 122:

            return _SEGMENTS[o-87] # lowercase a-z

        if o >= 48 and o <= 57:

            return _SEGMENTS[o-48] # 0-9

        raise ValueError("Character out of range: {:d} '{:s}'".format(o, chr(o)))

    def hex(self, val):

        """Display a hex value 0x0000 through 0xffff, right aligned."""

        string = '{:04x}'.format(val & 0xffff)

        self.write(self.encode_string(string))

    def number(self, num):

        """Display a numeric value -999 through 9999, right aligned."""

        # limit to range -999 to 9999

        num = max(-999, min(num, 9999))

        string = '{0: >4d}'.format(num)

        self.write(self.encode_string(string))

    def numbers(self, num1, num2, colon=True):

        """Display two numeric values -9 through 99, with leading zeros

        and separated by a colon."""

        num1 = max(-9, min(num1, 99))

        num2 = max(-9, min(num2, 99))

        segments = self.encode_string('{0:0>2d}{1:0>2d}'.format(num1, num2))

        if colon:

            segments[1] |= 0x80 # colon on

        self.write(segments)

    def temperature(self, num):

        if num < -9:

            self.show('lo') # low

        elif num > 99:

            self.show('hi') # high

        else:

            string = '{0: >2d}'.format(num)

            self.write(self.encode_string(string))

        self.write([_SEGMENTS[38], _SEGMENTS[12]], 2) # degrees C

    def show(self, string, colon=False):

        segments = self.encode_string(string)

        if len(segments) > 1 and colon:

            segments[1] |= 128

        self.write(segments[:4])

    def scroll(self, string, delay=250):

        segments = string if isinstance(string, list) else self.encode_string(string)

        data = [0] * 8

        data[4:0] = list(segments)

        for i in range(len(segments) + 5):

            self.write(data[0+i:4+i])

            sleep_ms(delay)

class TM1637Decimal(TM1637):

    """Library for quad 7-segment LED modules based on the TM1637 LED driver.

    This class is meant to be used with decimal display modules (modules

    that have a decimal point after each 7-segment LED).

    """

    def encode_string(self, string):

        """Convert a string to LED segments.

        Convert an up to 4 character length string containing 0-9, a-z,

        space, dash, star and '.' to an array of segments, matching the length of

        the source string."""

        segments = bytearray(len(string.replace('.','')))

        j = 0

        for i in range(len(string)):

            if string[i] == '.' and j > 0:

                segments[j-1] |= TM1637_MSB

                continue

            segments[j] = self.encode_char(string[i])

            j += 1

        return segments

————————————————

版权声明：本文为CSDN博主「路易斯720」的原创文章，遵循CC 4.0 BY-SA版权协议，转载请附上原文出处链接及本声明。

原文链接：https://blog.csdn.net/weixin_74155302/article/details/131014093