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Copy pathNodeMCU_DS18B20_AsyncWebServer.ino
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NodeMCU_DS18B20_AsyncWebServer.ino
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/*********
Rui Santos
Complete project details at https://RandomNerdTutorials.com
*********/
// Import required libraries导入所需的库
#ifdef ESP32
#include <WiFi.h>
#include <ESPAsyncWebServer.h>
#else
#include <Arduino.h>
#include <ESP8266WiFi.h>
#include <Hash.h>
#include <ESPAsyncTCP.h>
#include <ESPAsyncWebServer.h> //异步服务器
#endif
#include <OneWire.h>
#include <DallasTemperature.h>
// Data wire is connected to GPIO 4
#define ONE_WIRE_BUS 4
// Setup a oneWire instance to communicate with any OneWire devices
OneWire oneWire(ONE_WIRE_BUS);
// Pass our oneWire reference to Dallas Temperature sensor
DallasTemperature sensors(&oneWire);
// Replace with your network credentials
const char* ssid = "WL-911";
const char* password = "123456789";
// Create AsyncWebServer object on port 80
AsyncWebServer server(80);
String readDSTemperatureC() { //所述readDSTemperatureC（）函数返回以摄氏度读数
// Call sensors.requestTemperatures() to issue a global temperature and Requests to all devices on the bus
sensors.requestTemperatures();
float tempC = sensors.getTempCByIndex(0);
if(tempC == -127.00) {
Serial.println("Failed to read from DS18B20 sensor");
return "--";
} else {
Serial.print("Temperature Celsius: ");
Serial.println(tempC);
}
return String(tempC); //读数以字符串类型返回。要将float转换为字符串，请使用String（）函数。
}
String readDSTemperatureF() {
// Call sensors.requestTemperatures() to issue a global temperature and Requests to all devices on the bus
sensors.requestTemperatures();
float tempF = sensors.getTempFByIndex(0);
if(int(tempF) == -196){
Serial.println("Failed to read from DS18B20 sensor");
return "--";
} else {
Serial.print("Temperature Fahrenheit: ");
Serial.println(tempF);
}
return String(tempF);
}
const char index_html[] PROGMEM = R"rawliteral(
<!DOCTYPE HTML><html>
<head>
<meta name="viewport" content="width=device-width, initial-scale=1">
<link rel="stylesheet" href="https://use.fontawesome.com/releases/v5.7.2/css/all.css" integrity="sha384-fnmOCqbTlWIlj8LyTjo7mOUStjsKC4pOpQbqyi7RrhN7udi9RwhKkMHpvLbHG9Sr" crossorigin="anonymous">
<style>
html {
font-family: Arial;
display: inline-block;
margin: 0px auto;
text-align: center;
}
h2 { font-size: 3.0rem; }
p { font-size: 3.0rem; }
.units { font-size: 1.2rem; }
.ds-labels{
font-size: 1.5rem;
vertical-align:middle;
padding-bottom: 15px;
}
</style>
</head>
<body>
<h2>ESP DS18B20 Server</h2>
<p>
<i class="fas fa-thermometer-half" style="color:#059e8a;"></i>
<span class="ds-labels">Temperature Celsius</span>
<span id="temperaturec">%TEMPERATUREC%</span>
<sup class="units">°C</sup>
</p>
<p>
<i class="fas fa-thermometer-half" style="color:#059e8a;"></i>
<span class="ds-labels">Temperature Fahrenheit</span>
<span id="temperaturef">%TEMPERATUREF%</span>
<sup class="units">°F</sup>
</p>
</body>
<script>
setInterval(function ( ) {
var xhttp = new XMLHttpRequest();
xhttp.onreadystatechange = function() {
if (this.readyState == 4 && this.status == 200) {
document.getElementById("temperaturec").innerHTML = this.responseText;
}
};
xhttp.open("GET", "/temperaturec", true);
xhttp.send();
}, 10000) ;
setInterval(function ( ) {
var xhttp = new XMLHttpRequest();
xhttp.onreadystatechange = function() {
if (this.readyState == 4 && this.status == 200) {
document.getElementById("temperaturef").innerHTML = this.responseText;
}
};
xhttp.open("GET", "/temperaturef", true);
xhttp.send();
}, 10000) ;
</script>
</html>)rawliteral";
// Replaces placeholder with DHT values
String processor(const String& var){ //创建processor（）函数，该函数将用实际温度值替换HTML文本中的占位符。
//Serial.println(var);
if(var == "TEMPERATUREC"){
return readDSTemperatureC();
}
else if(var == "TEMPERATUREF"){ //如果占位符为％TEMPERATUREF％，则以华氏温度返回温度。
return readDSTemperatureF();
}
return String();
}
void setup(){
// Serial port for debugging purposes
Serial.begin(115200);
Serial.println();
// Start up the DS18B20 library
sensors.begin();
// Connect to Wi-Fi
WiFi.begin(ssid, password);
Serial.println("Connecting to WiFi");
while (WiFi.status() != WL_CONNECTED) {
delay(500);
Serial.print(".");
}
Serial.println();
// Print ESP Local IP Address
Serial.println(WiFi.localIP());
// Route for root / web page
server.on("/", HTTP_GET, [](AsyncWebServerRequest *request){
request->send_P(200, "text/html", index_html, processor); //当我们对根URL发出请求时，我们将发送存储在index_html变量中的HTML文本。我们还需要传递处理器函数，该函数将用正确的值替换所有占位符。
});
server.on("/temperaturec", HTTP_GET, [](AsyncWebServerRequest *request){
request->send_P(200, "text/plain", readDSTemperatureC().c_str()); //我们需要添加两个其他处理程序来更新温度读数。当我们在/ temperature c URL 上收到请求时 ，我们只需要发送更新的温度值。它是纯文本，应该以char形式发送，因此我们使用c_str（）方法。
});
server.on("/temperaturef", HTTP_GET, [](AsyncWebServerRequest *request){
request->send_P(200, "text/plain", readDSTemperatureF().c_str());
});
// Start server
server.begin();
}
void loop(){ //因为这是一个异步Web服务器，所以我们不需要在loop（）中编写任何内容。
}