DS18B20溫度感應模組+顯示網頁-micropython

DS18B20
micropython esp32
發布日期:   2021-08-29
更新日期:   2021-08-29
閱讀次數:  

DS18B20溫度感應模組+顯示網頁-micropython

tags: micropython ds18b20

DS18B20 溫度傳感器是一種單線數字溫度傳感器。這意味著它只需要一根數據線（和 GND）即可與您的 ESP32 或 ESP8266 通信。

它可以由外部電源供電，也可以從數據線獲取電源（稱為“寄生模式”），從而無需外部電源。

以下是 DS18B20 溫度傳感器最相關規格的摘要：

通過單線總線通信
電源範圍：3.0V 至 5.5V
工作溫度範圍：-55ºC 至 +125ºC
精度 +/-0.5 ºC（介於 -10ºC 至 85ºC 之間）**

接線

程式碼

from machine import Pin

from time import sleep

import time

import onewire, ds18x20

  
dsSensor=ds18x20.DS18X20(onewire.OneWire(Pin(4)))

scan=dsSensor.scan()

print("Devices: ",scan)

while True:

    rows=ds_sensor.scan()

    print("The devices: ", rows)

    sleep(1)

    for row in rows:

      ds_sensor.convert_temp()

      print(row)

      temp=ds_sensor.read_temp(row)

 print(temp)

解析

匯入Pin,sleep,單總線,溫度模組

from machine import Pin

from time import sleep

import time

import onewire, ds18x20

構造函數

ow=onewire.OneWire(machine.Pin(id))

構建單總線對象。 id:引腳編號；

使用方法

ow.scan()

構造函數

ds=ds18x20.DS18X20(ow)

構建 DS18B20 傳感器對象。 ow:定義好的單總線對象；

使用方法

ds.scan()

掃描總線上的設備。返回設備地址，支持多設備同時掛載。

ds.convert_temp()

溫度轉換。

ds.read_temp(rom)

獲取溫度值。 rom：表示對應的設備號。

dsSensor=ds18x20.DS18X20(onewire.OneWire(Pin(4)))

scan=dsSensor.scan()

print("Devices: ",scan)

while True:

    rows=ds_sensor.scan()

    print("The devices: ", rows)

    sleep(1)

    for row in rows:

      ds_sensor.convert_temp()

      print(row)

      temp=ds_sensor.read_temp(row)

 print(temp)

顯示結果

Devices:  \[bytearray(b'(t~\\x19\\r\\x00\\x00.')\]

bytearray(b'(t~\\x19\\r\\x00\\x00.')

26.4375

bytearray(b'(t~\\x19\\r\\x00\\x00.')

26.375

bytearray(b'(t~\\x19\\r\\x00\\x00.')

26.375

bytearray(b'(t~\\x19\\r\\x00\\x00.')

26.5625    

加上網頁顯示數據

首先動手寫一個html,並把它封包起來方便呼叫

def web_html():

  html="""<!DOCTYPE html>

      <html>

      <head>

        <meta charset="utf-8" />

        <meta http-equiv="refresh" content="1" />

        <meta name="viewport" content="width=device-width, initial-scale=1.0" />

        <title>ESP32 TO DS18B20</title>

        <style type="text/css">

          body {

            color: rgb(9, 39, 95);

            background-color: rgb(214, 205, 231);

            font-family: 'Lucida Sans', 'Lucida Sans Regular', 'Lucida Grande', 'Lucida Sans Unicode', Geneva, Verdana, sans-serif;

          }

          h1 {text-align: center;}

          h2 {text-align: center; color: rgb(60, 12, 114);}

          h3 {text-align: center; color: deeppink;}

          dd {text-align: center;}

        </style>

      </head>

      <body>

        <h1>ESP32 TO DS18D20</h1>

        <p Align=center><img src="https://media.istockphoto.com/photos/fahrenheit-and-celsius-scale-meteorology-thermometer-for-measuring-picture-id1138308244" height="150" width="100" ></p>

        <dl>

          <dt><h2>Temperature</h2></dt>

          <h3><dd class="val">"""+str(round(temp, 2))+""" *C</dd><h3>

        </dl>

        <br></br>

        <dl>

          <p><i class="fas fa-temperature-high"></i></p>

          <dt><h2>Temperature</h2></dt>

          <h3><dd class="val">"""+str(round(temp * (9/5) + 32.0, 2))+""" *F</dd></h3>

        </dl>

      </body>

      </html>"""

  return html

之後加入wifi和socket套接客戶端的相關的接收和請求

整個程式碼如下:

import socket

from time import sleep

import time

from machine import Pin

import onewire, ds18x20

import network

  

ssid="基地台名稱"

password="基地台密碼"


def connected_wifi():

  global ssid, password

  wifi=network.WLAN(network.STA_IF)

  wifi.active(True)

  wifi.connect(ssid, password)

  while wifi.isconnected()==False:

    pass

  print("connected successful!")

  print("IP: {}".format(wifi.ifconfig()))


def read_sensor():

  global temp

  ds_sensor=ds18x20.DS18X20(onewire.OneWire(Pin(4)))

  while True:

    rows=ds_sensor.scan()

    print("The devices: ", rows)

    sleep(1)

    for row in rows:

      ds_sensor.convert_temp()

      print(row)

      temp=ds_sensor.read_temp(row)

      return temp


def web_html():

  html="""<!DOCTYPE html>

      <html>

      <head>

        <meta charset="utf-8" />

        <meta http-equiv="refresh" content="1" />

        <meta name="viewport" content="width=device-width, initial-scale=1.0" />

        <title>ESP32 TO DS18B20</title>

        <style type="text/css">

          body {

            color: rgb(9, 39, 95);

            background-color: rgb(214, 205, 231);

            font-family: 'Lucida Sans', 'Lucida Sans Regular', 'Lucida Grande', 'Lucida Sans Unicode', Geneva, Verdana, sans-serif;

          }

          h1 {text-align: center;}

          h2 {text-align: center; color: rgb(60, 12, 114);}

          h3 {text-align: center; color: deeppink;}

          dd {text-align: center;}

        </style>

      </head>

      <body>

        <h1>ESP32 TO DS18D20</h1>

        <p Align=center><img src="https://media.istockphoto.com/photos/fahrenheit-and-celsius-scale-meteorology-thermometer-for-measuring-picture-id1138308244" height="150" width="100" ></p>

        <dl>

          <dt><h2>Temperature</h2></dt>

          <h3><dd class="val">"""+str(round(temp, 2))+""" *C</dd><h3>

        </dl>

        <br></br>

        <dl>

          <p><i class="fas fa-temperature-high"></i></p>

          <dt><h2>Temperature</h2></dt>

          <h3><dd class="val">"""+str(round(temp * (9/5) + 32.0, 2))+""" *F</dd></h3>

        </dl>

      </body>

      </html>"""

  return html

  
connected_wifi()

s=socket.socket(socket.AF_INET, socket.SOCK_STREAM)

s.bind(('', 80))

s.listen(5)

  

while True:

  conn, addr = s.accept()

  print('Got a connection from %s'%str(addr))

  request = conn.recv(1024)

  print("content: %s"%str(request))

  read_temp=read_sensor()

  print(read_temp)

  res=web_html()

  conn.send("http/1.1 200 OK\n")

  conn.send("Content-Type: text/html\n")

  conn.send("Connection: close\n\n")

  conn.sendall(res)

  conn.close()

解析

匯入machine, sockt, network, HC_SR04模組

from machine import Pin 

from HC_SR04 import HCSR04

import socket, network

設定wifi連線

def connected_wifi():

  global ssid, password

  wifi=network.WLAN(network.STA_IF)

  wifi.active(True)

  wifi.connect(ssid, password)

  while wifi.isconnected()==False:

    pass

  print("connected successful!")

 print("IP: {}".format(wifi.ifconfig()))

讀取DS18B20數據

def read_sensor():

  global temp

  ds_sensor=ds18x20.DS18X20(onewire.OneWire(Pin(4)))

  while True:

    rows=ds_sensor.scan()

    print("The devices: ", rows)

    sleep(1)

    for row in rows:

      ds_sensor.convert_temp()

      print(row)

      temp=ds_sensor.read_temp(row)

      return temp

socket套接

s=socket.socket(socket.AF_INET, socket.SOCK_STREAM)

s.bind(('', 80))

s.listen(5)

while True:

  conn, addr = s.accept()

  print('Got a connection from %s'%str(addr))

  request = conn.recv(1024)

  print("content: %s"%str(request))

  read_temp=read_sensor()

  print(read_temp)

  res=web_html()

  conn.send("http/1.1 200 OK\\n")

  conn.send("Content-Type: text/html\n")

  conn.send("Connection: close\n\n")

  conn.sendall(res)

  conn.close()

文章作者: blairan
文章鏈接: https://blairan.github.io/2021/08/29/ds18b20-wen-du-gan-ying-mo-zu-xian-shi-wang-ye-micropython/
版權聲明: 本博客所有文章除特別聲明外，均採用 CC BY 4.0 許可協議。轉載請註明來源 blairan !
DS18B20
评论
  目錄