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2021 iThome 鐵人賽

DAY 22
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自我挑戰組

Maker making IoT !!系列 第 22

[Day21] Esp32用STA mode + AHT10

1.前言

前兩天看完AHT10 + APmode 那篇後,是不是對這篇抱有更大的期待與興趣了,因為STA可以使Esp32s有上網功能可以做更多的應用,這邊也就不多贅述,馬上進入主題。

2.接線圖

圖片取自:使用者繪製

Esp32s GND -> St01(C) -
Esp32s Vcc(5V) -> St01(C) +
Esp32s 22 -> St01(C) SCL
Esp32s 21 -> St01(C) SDA

3.程式碼

※切記ssid及password內的數值需更改成自己的手機基地台或WiFi分享器的名稱和密碼。

#include <WiFi.h>
#include <ESPAsyncWebServer.h>

#include <AHT10.h>
#include <Wire.h>
uint8_t readStatus = 0;
AHT10 myAHT10(AHT10_ADDRESS_0X38);

const char* ssid     = "xxxx";
const char* password = "xxxxxxxx";

// current temperature & humidity, updated in loop()
float t = 0.0;
float h = 0.0;

// Create AsyncWebServer object on port 80
AsyncWebServer server(80);

// Generally, you should use "unsigned long" for variables that hold time
// The value will quickly become too large for an int to store
unsigned long previousMillis = 0;    // will store last time myAHT10 was updated

// Updates myAHT10 readings every 10 seconds
const long interval = 10000;  

const char index_html[] PROGMEM = R"rawliteral(
<!DOCTYPE HTML><html>
<head>
  <meta name="viewport" content="width=device-width, initial-scale=1">
  <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; }
    .myAHT10-labels{
      font-size: 1.5rem;
      vertical-align:middle;
      padding-bottom: 15px;
    }
  </style>
</head>
<body>
  <h2>ESP32 AHT10 Server</h2>
  <p>
    <span class="myAHT10-labels">Temperature</span> 
    <span id="temperature">%TEMPERATURE%</span>
    <sup class="units">&deg;C</sup>
  </p>
  <p>
    <span class="myAHT10-labels">Humidity</span>
    <span id="humidity">%HUMIDITY%</span>
    <sup class="units">%</sup>
  </p>
</body>
<script>
setInterval(function ( ) {
  var xhttp = new XMLHttpRequest();
  xhttp.onreadystatechange = function() {
    if (this.readyState == 4 && this.status == 200) {
      document.getElementById("temperature").innerHTML = this.responseText;
    }
  };
  xhttp.open("GET", "/temperature", true);
  xhttp.send();
}, 10000 ) ;

setInterval(function ( ) {
  var xhttp = new XMLHttpRequest();
  xhttp.onreadystatechange = function() {
    if (this.readyState == 4 && this.status == 200) {
      document.getElementById("humidity").innerHTML = this.responseText;
    }
  };
  xhttp.open("GET", "/humidity", true);
  xhttp.send();
}, 10000 ) ;
</script>
</html>)rawliteral";

// Replaces placeholder with myAHT10 values
String processor(const String& var){
  //Serial.println(var);
  if(var == "TEMPERATURE"){
    return String(t);
  }
  else if(var == "HUMIDITY"){
    return String(h);
  }
  return String();
}

void setup(){
  // Serial port for debugging purposes
  Serial.begin(115200);
  myAHT10.begin();

  Serial.print("Connecting to ");
  Serial.println(ssid);
  WiFi.begin(ssid, password);
  while (WiFi.status() != WL_CONNECTED) {
    delay(500);
    Serial.print(".");
  }
  // Print local IP address and start web server
  Serial.println("");
  Serial.println("WiFi connected.");
  Serial.println("IP address: ");
  Serial.println(WiFi.localIP());
  server.begin();

   // Route for root / web page
  server.on("/", HTTP_GET, [](AsyncWebServerRequest *request){
    request->send_P(200, "text/html", index_html, processor);
  });
  server.on("/temperature", HTTP_GET, [](AsyncWebServerRequest *request){
    request->send_P(200, "text/plain", String(t).c_str());
  });
  server.on("/humidity", HTTP_GET, [](AsyncWebServerRequest *request){
    request->send_P(200, "text/plain", String(h).c_str());
  });

  // Start server
  server.begin();
}
 
void loop(){  
  unsigned long currentMillis = millis();
  if (currentMillis - previousMillis >= interval) {
    // save the last time you updated the myAHT10 values
    previousMillis = currentMillis;
    // Read temperature as Celsius (the default)
    float newT = myAHT10.readTemperature();
    // Read temperature as Fahrenheit (isFahrenheit = true)
    //float newT = myAHT10.readTemperature(true);
    // if temperature read failed, don't change t value
    if (isnan(newT)) {
      Serial.println("Failed to read from myAHT10 sensor!");
    }
    else {
      t = newT;
      Serial.println(t);
    }
    // Read Humidity
    float newH = myAHT10.readHumidity();
    // if humidity read failed, don't change h value 
    if (isnan(newH)) {
      Serial.println("Failed to read from myAHT10 sensor!");
    }
    else {
      h = newH;
      Serial.println(h);
    }
  }
}

4.操作畫面

連上後會顯示電信商提供給Esp32s的IP位置,在這同時如AHT10有讀取,就會在監控視窗上衣同顯示。

圖片取自:開發者拍攝

如有看見這網頁代表成功拉,這之後可以嘗試觸碰AHT10,看能否會更新網頁上的數值。

圖片取自:開發者拍攝

歡迎交流

好了,這篇和之前的作品的STA都是跟AP顯示相同畫面,但是之後的實作章節會真正去運用STA,那就請各位敬請期待,那就明天講解程式碼見囉~


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[Day20] Esp32用AP mode + AHT10 - (程式碼講解)
下一篇
[Day22] Esp32用STA mode + AHT10 - (程式碼講解)
系列文
Maker making IoT !!30

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