esp32温度测量

测量温度thonny代码！可以测量-55到155的温度

温度测量.py

# 导入所需的模块
# machine模块包含了控制硬件的基本功能，如I2C通信、GPIO引脚控制和定时器
# ssd1306模块用于控制SSD1306型号的OLED显示屏
# onewire和ds18x20模块用于与单总线温度传感器（如DS18B20）通信
from machine import I2C, Pin, Timer
from ssd1306 import SSD1306_I2C
import onewire, ds18x20

# 显示屏设置
# 初始化I2C通信，sda为数据线，连接到GPIO 23，scl为时钟线，连接到GPIO 19
i2c = I2C(sda=Pin(23), scl=Pin(19))
# 初始化SSD1306 OLED显示屏，尺寸为128x64像素，使用之前初始化的I2C对象，并设置I2C地址为0x3c
oled = SSD1306_I2C(128, 64, i2c, addr=0x3c)

# 单总线温度传感器设置
# 使用Y12引脚（GPIO 18）创建单总线对象，用于与DS18x20温度传感器通信
ow = onewire.OneWire(Pin(18))
# 创建DS18x20对象，用于读取温度数据
ds = ds18x20.DS18X20(ow)

# 扫描总线上的设备地址
# 扫描并获取连接到单总线上的DS18x20传感器的ROM地址列表
rom = ds.scan()

# 定义RUN函数，该函数将作为定时器的回调函数
def RUN(t):
    # 触发温度转换
    ds.convert_temp()
    # 读取第一个（或唯一一个）传感器的温度值
    temp = ds.read_temp(rom[0])
    
    # 清空OLED显示屏
    oled.fill(0)
    # 在OLED显示屏上显示文本"Temperature"
    oled.text("Temperature", 0, 0)
    
    # 在OLED显示屏上显示温度值，保留两位小数
    oled.text("{:.2f} C".format(temp), 0, 32)
    # 更新OLED显示屏以显示新内容
    oled.show()
    
# 初始化定时器
# 创建一个定时器对象，不指定初始值（-1）
time0 = Timer(-1)
# 初始化定时器，设置周期为1000毫秒（1秒），模式为周期性（PERIODIC），并指定回调函数RUN
time0.init(period=1000, mode=Timer.PERIODIC, callback=RUN)




# 这段代码的主要功能是每隔一秒读取一个DS18x20温度传感器的温度值，并将该温度值显示在一块128x64像素的SSD1306 OLED显示屏上。
# 通过I2C通信与显示屏交互，通过单总线协议与温度传感器通信。

后面是SSD1306_I2C.py，要确保在同一文件夹

# MicroPython SSD1306 OLED driver, I2C and SPI interfaces
from micropython import const
import time
import framebuf
import sys

currentBoard=""
if(sys.platform=="esp8266"):
  currentBoard="esp8266"
elif(sys.platform=="esp32"):
  currentBoard="esp32"
elif(sys.platform=="pyboard"):
  currentBoard="pyboard"
  import pyb
# register definitions
SET_CONTRAST        = const(0x81)
SET_ENTIRE_ON       = const(0xa4)
SET_NORM_INV        = const(0xa6)
SET_DISP            = const(0xae)
SET_MEM_ADDR        = const(0x20)
SET_COL_ADDR        = const(0x21)
SET_PAGE_ADDR       = const(0x22)
SET_DISP_START_LINE = const(0x40)
SET_SEG_REMAP       = const(0xa0)
SET_MUX_RATIO       = const(0xa8)
SET_COM_OUT_DIR     = const(0xc0)
SET_DISP_OFFSET     = const(0xd3)
SET_COM_PIN_CFG     = const(0xda)
SET_DISP_CLK_DIV    = const(0xd5)
SET_PRECHARGE       = const(0xd9)
SET_VCOM_DESEL      = const(0xdb)
SET_CHARGE_PUMP     = const(0x8d)
class ssd1306:
  def __init__(self, width, height, external_vcc):
    self.width = width
    self.height = height
    self.external_vcc = external_vcc
    self.pages = self.height // 8
    self.buffer = bytearray(self.pages * self.width)
    self.framebuf = framebuf.FrameBuffer(self.buffer, self.width, self.height, framebuf.MVLSB)
    self.poweron()
    self.init_display()
  def init_display(self):
    for cmd in (
      SET_DISP | 0x00, # off
      # address setting
      SET_MEM_ADDR, 0x00, # horizontal
      # resolution and layout
      SET_DISP_START_LINE | 0x00,
      SET_SEG_REMAP | 0x01, # column addr 127 mapped to SEG0
      SET_MUX_RATIO, self.height - 1,
      SET_COM_OUT_DIR | 0x08, # scan from COM[N] to COM0
      SET_DISP_OFFSET, 0x00,
      SET_COM_PIN_CFG, 0x02 if self.height == 32 else 0x12,
      # timing and driving scheme
      SET_DISP_CLK_DIV, 0x80,
      SET_PRECHARGE, 0x22 if self.external_vcc else 0xf1,
      SET_VCOM_DESEL, 0x30, # 0.83*Vcc
      # display
      SET_CONTRAST, 0xff, # maximum
      SET_ENTIRE_ON, # output follows RAM contents
      SET_NORM_INV, # not inverted
      # charge pump
      SET_CHARGE_PUMP, 0x10 if self.external_vcc else 0x14,
      SET_DISP | 0x01): # on
      self.write_cmd(cmd)
    self.fill(0)
    self.show()
  def poweroff(self):
    self.write_cmd(SET_DISP | 0x00)
  def contrast(self, contrast):
    self.write_cmd(SET_CONTRAST)
    self.write_cmd(contrast)
  def invert(self, invert):
    self.write_cmd(SET_NORM_INV | (invert & 1))
  def show(self):
    x0 = 0
    x1 = self.width - 1
    if self.width == 64:
      # displays with width of 64 pixels are shifted by 32
      x0 += 32
      x1 += 32
    self.write_cmd(SET_COL_ADDR)
    self.write_cmd(x0)
    self.write_cmd(x1)
    self.write_cmd(SET_PAGE_ADDR)
    self.write_cmd(0)
    self.write_cmd(self.pages - 1)
    self.write_data(self.buffer)
  def fill(self, col):
    self.framebuf.fill(col)
  def pixel(self, x, y, col):
    self.framebuf.pixel(x, y, col)
  def scroll(self, dx, dy):
    self.framebuf.scroll(dx, dy)
  def text(self, string, x, y, col=1):
    self.framebuf.text(string, x, y, col)
  def hline(self, x, y, w, col):
    self.framebuf.hline(x, y, w, col)
  def vline(self, x, y, h, col):
    self.framebuf.vline(x, y, h, col)
  def line(self, x1, y1, x2, y2, col):
    self.framebuf.line(x1, y1, x2, y2, col)
  def rect(self, x, y, w, h, col):
    self.framebuf.rect(x, y, w, h, col)
  def fill_rect(self, x, y, w, h, col):
    self.framebuf.fill_rect(x, y, w, h, col)
  def blit(self, fbuf, x, y):
    self.framebuf.blit(fbuf, x, y)

class SSD1306_I2C(ssd1306):
  def __init__(self, width, height, i2c, addr=0x3c, external_vcc=False):
    self.i2c = i2c
    self.addr = addr
    self.temp = bytearray(2)
    super().__init__(width, height, external_vcc)
  def write_cmd(self, cmd):
    self.temp[0] = 0x80 # Co=1, D/C#=0
    self.temp[1] = cmd
    #IF SYS  :
    global currentBoard
    if currentBoard=="esp8266" or currentBoard=="esp32":
      self.i2c.writeto(self.addr, self.temp)
    elif currentBoard=="pyboard":
      self.i2c.send(self.temp,self.addr)
    #ELSE:
          
  def write_data(self, buf):
    self.temp[0] = self.addr << 1
    self.temp[1] = 0x40 # Co=0, D/C#=1
    global currentBoard
    if currentBoard=="esp8266" or currentBoard=="esp32":
      self.i2c.start()
      self.i2c.write(self.temp)
      self.i2c.write(buf)
      self.i2c.stop()
    elif currentBoard=="pyboard":
      #self.i2c.send(self.temp,self.addr)
      #self.i2c.send(buf,self.addr)
      self.i2c.mem_write(buf,self.addr,0x40)
  def show_str(self,str1,str2,str3,str4):
    self.text(str1,0,0)
    self.text(str2,0,16)
    self.text(str3,0,32)
    self.text(str4,0,48)
    self.show()
  def show_rect(self, x, y, w, h, col):
    self.rect(x, y, w, h, col)
    self.show()
  def show_fill_rect(self, x, y, w, h, col):
    self.fill_rect(x, y, w, h, col)
    self.show()
  def show_hline(self, x, y, w, col):
    self.hline(x, y, w, col)
    self.show()
  def show_vline(self, x, y, h, col):
    self.vline(x, y, h, col)
    self.show()
  def show_line(self, x1, y1, x2, y2, col):
    self.line(x1, y1, x2, y2, col)
    self.show()
  def show_fill(self,col):
    self.fill(col)
    self.show()
  def poweron(self):
    pass

class SSD1306_SPI(ssd1306):
  def __init__(self, width, height, spi, dc, res, cs, external_vcc=False):
    self.rate = 10 * 1024 * 1024
    dc.init(dc.OUT, value=0)
    res.init(res.OUT, value=0)
    cs.init(cs.OUT, value=1)
    self.spi = spi
    self.dc = dc
    self.res = res
    self.cs = cs
    super().__init__(width, height, external_vcc)
  def write_cmd(self, cmd):
    global currentBoard
    if currentBoard=="esp8266" or currentBoard=="esp32":
      self.spi.init(baudrate=self.rate, polarity=0, phase=0)
    elif currentBoard=="pyboard":
      self.spi.init(mode = pyb.SPI.MASTER,baudrate=self.rate, polarity=0, phase=0)
    self.cs.high()
    self.dc.low()
    self.cs.low()
    global currentBoard
    if currentBoard=="esp8266" or currentBoard=="esp32":
      self.spi.write(bytearray([cmd]))
    elif currentBoard=="pyboard":
      self.spi.send(bytearray([cmd]))
    self.cs.high()
  def write_data(self, buf):
    global currentBoard
    if currentBoard=="esp8266" or currentBoard=="esp32":
      self.spi.init(baudrate=self.rate, polarity=0, phase=0)
    elif currentBoard=="pyboard":
      self.spi.init(mode = pyb.SPI.MASTER,baudrate=self.rate, polarity=0, phase=0)
    self.cs.high()
    self.dc.high()
    self.cs.low()
    global currentBoard
    if currentBoard=="esp8266" or currentBoard=="esp32":
      self.spi.write(buf)
    elif currentBoard=="pyboard":
      self.spi.send(buf)
    self.cs.high()
  def poweron(self):
    self.res.high()
    time.sleep_ms(1)
    self.res.low()
    time.sleep_ms(10)
    self.res.high()