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学习 MicroPython,做一个会“报警”的温度计

  • 2026-02-06 10:40:40
学习 MicroPython,做一个会“报警”的温度计
温度计早已不再只是简单的数值显示。在本项目中,我们基于 RP2040 嵌入式系统学习平台,通过 MicroPython 编程,结合 ST7789 SPI 彩屏、按键、蜂鸣器,制作了一个具备图形化界面和超温报警功能的“智能温度计”。
当温度超过设定阈值时,蜂鸣器会鸣响并在屏幕上实时以红色提示,低于阈值则恢复绿色显示,直观而生动。这个项目不仅让你掌握 按键去抖与事件回调、ADC温度采集、PWM 蜂鸣器驱动、ST7789图形界面绘制等关键技能,还能锻炼完整的嵌入式系统设计思路。

主要外设

1)按键A\B设置报警温度增加 、减少;

2)ST7789 SPI显示屏进行温度显示,界面交互;

3)蜂鸣器,通过PWM进行驱动报警。

实现框图

使用micropython 编程环境,通过ST7789 自绘制界面,然后通过RP2040 ADC读取内部温度,并实时显示。

按键处理的实现

按键驱动调用了笛子老师的基础库。

import timefrom machine import Pinclass button:    def __init__(self, pin, callback=None, trigger=Pin.IRQ_RISING, min_ago=200):        #print("button init")        self.callback = callback        self.min_ago = min_ago        self._next_call = time.ticks_add(time.ticks_ms(), self.min_ago)        self.pin = Pin(pin, Pin.IN, Pin.PULL_UP)        self.pin.irq(trigger=trigger, handler=self.debounce_handler)        self._is_pressed = False    def call_callback(self, pin):        #print("call_callback")        self._is_pressed = True        if self.callback is not None:            self.callback(pin)    def debounce_handler(self, pin):        #print("debounce")        if time.ticks_diff(time.ticks_ms(), self._next_call) > 0:            self._next_call = time.ticks_add(time.ticks_ms(), self.min_ago)            self.call_callback(pin)    def value(self):        p = self._is_pressed        self._is_pressed = False        return p

主要实现按键的去抖和事件回调:

  • pin 为gpio pin 定义;

  • callback为回调函数;

  • trigger 为触发的边沿 默认为上升沿;

  • min_ago 为消抖的时间设定;

  • 主代码中进行标记参数更新。

## 设置阈值set_alarm_temp = 30def BtnACallback(pin):    #print("press up")    global set_alarm_temp    global TEMP_MAX    if (set_alarm_temp+1)>TEMP_MAX:        set_alarm_temp = TEMP_MAX    else:       set_alarm_temp +=1    #ber.play()def BtnBCallback(pin):    global set_alarm_temp    global TEMP_MIN    #print("press down")    if (set_alarm_temp -1)<TEMP_MIN:        set_alarm_temp = 0    else:        set_alarm_temp -=1    #ber.stop()BtnUp =  button.button(6,BtnACallback,machine.Pin.IRQ_RISING)BtDown = button.button(5,BtnBCallback,machine.Pin.IRQ_RISING)
  • 实例化BtUp BtDown,分别对应硬件的 B A按键button,使用上升沿触发;

  • 当回调函数执行时,对set_alarm_temp (温度阈值进行自加或者自减,并进行边界参数防护);

  • 主循环时,通过采集的芯片内部的温度与set_alarm_temp 进行比较,然后进行相应的操作(报警、正常显示...)

界面显示

  • 界面显示参考了 breakout_colourlcd240x240  源代码,自己实现了 圆弧的绘制及填充圆弧的实现。

  • drawCirc_fill 实现绘制实心圆,tft 为实例化st7789的驱动,x,y对应坐标,r为圆的半径,pen为设置的颜色。

  • drawCirc 实现的是圆弧绘制,这里参数与drawCirc_fill 类似,只是后面的shape_type 不同,shape_type采用的bitmap形式,8bit对应 4个象限(0,45) (45,90) (90,135)(135,180) (180,225) (225,270) (270,315) (315,360) 8个弧形,方便进行后续的温度计顶端及底端的绘制。

def drawCirc_fill(tft,x,y,r,pen):    ox =r    oy =0    err = -r    while ox>=oy:        last_oy = oy        err +=oy        oy+=1        err+=oy        tft.hline(x-ox,y+last_oy,ox*2+1,pen) ##3        if last_oy != 0:            tft.hline(x-ox,y-last_oy,ox*2+1,pen)##2        if err>=0 and ox!=last_oy:            tft.hline(x-last_oy,y+ox,last_oy*2+1,pen)##4            if ox!=0:                tft.hline(x-last_oy,y-ox,last_oy*2+1,pen)##1            err -=ox            ox -=1            err -=ox#draw1_8 = 1#draw2_8 = 2#draw3_8 = 4#draw4_8 = 8#draw5_8 = 16#draw6_8 = 32#draw7_8 = 64#draw8_8 = 128def drawCirc(tft,x,y,r,color,shape_type=0):    x_i =0    y_i = r    p = 1-r    shape_bin = bin(shape_type)    while x_i<y_i:        x_i +=1        if p<0:            p += 2*x_i+1        else:            y_i -=1            p +=2*(x_i-y_i)+1        if shape_type&0x1:            tft.pixel(x+y_i,y-x_i,color)        if (shape_type>>1)&0x1:            tft.pixel(x+x_i,y-y_i,color)        if (shape_type>>2)&0x1:                   tft.pixel(x-x_i,y-y_i,color)        if (shape_type>>3)&0x1:            tft.pixel(x-y_i,y-x_i,color)        if (shape_type>>4)&0x1:                   tft.pixel(x-y_i,y+x_i,color)               if (shape_type>>5)&0x1:               tft.pixel(x-x_i,y+y_i,color)        if (shape_type>>6)&0x1:                   tft.pixel(x+x_i,y+y_i,color)             if (shape_type>>7)&0x1:               tft.pixel(x+y_i,y+x_i,color) 

屏幕初始化如下,使用四线spi 驱动。

st7789_res = 0st7789_dc  = 1disp_width = 240disp_height = 240spi_sck=machine.Pin(2)spi_tx=machine.Pin(3)spi0=machine.SPI(0,baudrate=4000000, phase=1, polarity=1, sck=spi_sck, mosi=spi_tx)display = st7789.ST7789(spi0, disp_width, disp_width,                          reset=machine.Pin(st7789_res, machine.Pin.OUT),                          dc=machine.Pin(st7789_dc, machine.Pin.OUT),                          xstart=0, ystart=0, rotation=0)

有了上面的函数,然后结合绘制线、长方形、长方形填充实现最终界面如下:

蜂鸣器,通过PWM进行驱动报警

蜂鸣器封装了一个库,实现如下:

主要实现PWM的频率、占空比设置,实际使用中只进行播放和停止。

from machine import Pin,PWMfrom time import sleepclass bzer():    def __init__(self,pin,freq,duty):        self.pin = pin        self.freq = freq        self.pwm = PWM(Pin(pin))        self.pwm.freq(freq)        self.pwm.duty_u16(0)        self.duty  =duty        self.play_flag = False    def stop(self):        self.pwm.duty_u16(0)        self.play_flag = False    def play(self):        self.pwm.duty_u16(self.duty)        self.play_flag = True    def inv(self):        if self.play_flag:            stop()        else:            play()    def setDuty(self,duty):        self.duty = duty    def SetFreq(self,freq):        self.freq = freq

主逻辑判断

实时更新当前温度,并进行阈值温度和当前温度判定,当当前温度小于阈值温度时,如果蜂鸣器在播放则停止播放,使界面变为绿色。当当前温度大于阈值温度时,使蜂鸣器播放,并使界面变为红色。

while True:    display.text(font1,"{:.0f}C".format(set_alarm_temp),10,180,st7789.CYAN)    reading = sensor_temp.read_u16() * conversion_factor    temperature = 27 - (reading - 0.706)/0.001721    if set_alarm_temp>temperature:        playColor=st7789.GREEN        if ber.play_flag:            ber.stop()    else :        playColor=st7789.RED        if not ber.play_flag:            ber.play()    len = int(int(temperature)*1.6) +18    display.fill_rect(102,52,26,146,st7789.BLACK)#x ,y w ,h    display.fill_rect(102,198-len,25,len,playColor)    drawCirc_fill(display,115,213,19,playColor)    for i in range(0,9):        display.hline(100,180-16*i,28,st7789.WHITE)        if i!=8:            display.hline(100,180-16*i-4,10,st7789.WHITE)            display.hline(100,180-16*i-8,20,st7789.WHITE)            display.hline(100,180-16*i-12,10,st7789.WHITE)    display.text(font1,'T:{:.0f}C'.format(temperature),60,80,st7789.MAGENTA)    utime.sleep(0.8)

项目收获

由于时间有限,屏幕设计的不太合理,更新数据会闪动,后续使用espi tft或 u8g2进行界面设计。此次项目收获很大,感谢老师、同学们的帮助、支持。希望后续多进行此类活动。

学习嵌入式,不仅要掌握语法和编程,更需要有一个合适的平台来承载你的创意。本项目用到的 基于 RP2040 的嵌入式系统学习平台,我们已在 小脚丫step企业店 上架。
它不仅适合课堂教学与竞赛训练,也能作为个人学习和项目开发的好伙伴。 淘宝搜索小脚丫 step 企业店,一起动手实现你的第一个“智能仪器”吧!

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  1. CONNECT:[ UseTime:0.000690s ] mysql:host=127.0.0.1;port=3306;dbname=f_mffb;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000898s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000380s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000271s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000510s ]
  6. SELECT * FROM `set` [ RunTime:0.000216s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000665s ]
  8. SELECT * FROM `article` WHERE `id` = 473868 LIMIT 1 [ RunTime:0.000464s ]
  9. UPDATE `article` SET `lasttime` = 1770448740 WHERE `id` = 473868 [ RunTime:0.007100s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 66 LIMIT 1 [ RunTime:0.000381s ]
  11. SELECT * FROM `article` WHERE `id` < 473868 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.000587s ]
  12. SELECT * FROM `article` WHERE `id` > 473868 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.000443s ]
  13. SELECT * FROM `article` WHERE `id` < 473868 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.000747s ]
  14. SELECT * FROM `article` WHERE `id` < 473868 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.007591s ]
  15. SELECT * FROM `article` WHERE `id` < 473868 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.001674s ]
0.089942s