1 | /*********
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2 | Rui Santos
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3 | Complete project details at https://randomnerdtutorials.com/esp8266-nodemcu-access-point-ap-web-server/
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4 |
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5 | Permission is hereby granted, free of charge, to any person obtaining a copy
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6 | of this software and associated documentation files.
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7 | The above copyright notice and this permission notice shall be included in all
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8 | copies or substantial portions of the Software.
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9 | *********/
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10 |
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11 | // Import required libraries
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12 | #include <Arduino.h>
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13 | #include <ESP8266WiFi.h>
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14 | #include <Hash.h>
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15 | #include <ESPAsyncTCP.h>
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16 | #include <ESPAsyncWebServer.h>
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17 | #include <Adafruit_Sensor.h>
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18 | #include <DHT.h>
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19 |
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20 | const char* ssid = "ESP_Temp";
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21 | const char* password = "0123456789";
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22 | int channel = 6;
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23 | int ssid_hidden = 0;
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24 | int max_connection = 8;
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25 |
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26 |
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27 | #define DHTPIN 2 // Digital pin connected to the DHT sensor
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28 |
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29 | // Uncomment the type of sensor in use:
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30 | #define DHTTYPE DHT11 // DHT 11
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31 | //#define DHTTYPE DHT22 // DHT 22 (AM2302)
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32 | //#define DHTTYPE DHT21 // DHT 21 (AM2301)
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33 |
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34 | DHT dht(DHTPIN, DHTTYPE);
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35 |
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36 | // current temperature & humidity, updated in loop()
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37 | float t = 0.0;
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38 | float h = 0.0;
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39 |
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40 | // Create AsyncWebServer object on port 80
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41 | AsyncWebServer server(80);
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42 |
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43 | // Generally, you should use "unsigned long" for variables that hold time
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44 | // The value will quickly become too large for an int to store
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45 | unsigned long previousMillis = 0; // will store last time DHT was updated
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46 |
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47 | // Updates DHT readings every 10 seconds
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48 | const long interval = 10000;
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49 |
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50 | const char index_html[] PROGMEM = R"rawliteral(
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51 | <!DOCTYPE HTML><html>
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52 | <head>
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53 | <meta name="viewport" content="width=device-width, initial-scale=1">
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54 | <style>
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55 | html {
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56 | font-family: Arial;
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57 | display: inline-block;
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58 | margin: 0px auto;
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59 | text-align: center;
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60 | }
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61 | h2 { font-size: 3.0rem; }
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62 | p { font-size: 3.0rem; }
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63 | .units { font-size: 1.2rem; }
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64 | .dht-labels{
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65 | font-size: 1.5rem;
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66 | vertical-align:middle;
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67 | padding-bottom: 15px;
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68 | }
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69 | </style>
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70 | </head>
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71 | <body>
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72 | <h2>ESP8266 DHT Server</h2>
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73 | <p>
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74 | <span class="dht-labels">Temperature</span>
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75 | <span id="temperature">%TEMPERATURE%</span>
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76 | <sup class="units">°C</sup>
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77 | </p>
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78 | <p>
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79 | <span class="dht-labels">Humidity</span>
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80 | <span id="humidity">%HUMIDITY%</span>
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81 | <sup class="units">%</sup>
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82 | </p>
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83 | </body>
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84 | <script>
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85 | setInterval(function ( ) {
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86 | var xhttp = new XMLHttpRequest();
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87 | xhttp.onreadystatechange = function() {
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88 | if (this.readyState == 4 && this.status == 200) {
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89 | document.getElementById("temperature").innerHTML = this.responseText;
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90 | }
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91 | };
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92 | xhttp.open("GET", "/temperature", true);
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93 | xhttp.send();
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94 | }, 10000 ) ;
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95 |
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96 | setInterval(function ( ) {
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97 | var xhttp = new XMLHttpRequest();
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98 | xhttp.onreadystatechange = function() {
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99 | if (this.readyState == 4 && this.status == 200) {
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100 | document.getElementById("humidity").innerHTML = this.responseText;
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101 | }
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102 | };
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103 | xhttp.open("GET", "/humidity", true);
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104 | xhttp.send();
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105 | }, 10000 ) ;
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106 | </script>
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107 | </html>)rawliteral";
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108 |
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109 | // Replaces placeholder with DHT values
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110 | String processor(const String& var){
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111 | //Serial.println(var);
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112 | if(var == "TEMPERATURE"){
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113 | return String(t);
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114 | }
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115 | else if(var == "HUMIDITY"){
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116 | return String(h);
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117 | }
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118 | return String();
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119 | }
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120 |
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121 | void setup(){
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122 | // Serial port for debugging purposes
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123 | Serial.begin(115200);
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124 | dht.begin();
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125 |
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126 | Serial.print("Setting AP (Access Point)…");
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127 | // Remove the password parameter, if you want the AP (Access Point) to be open
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128 | WiFi.softAP(ssid, password, channel, ssid_hidden, max_connection);
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129 |
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130 | IPAddress IP = WiFi.softAPIP();
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131 | Serial.print("AP IP address: ");
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132 | Serial.println(IP);
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133 |
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134 | // Print ESP8266 Local IP Address
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135 | Serial.println(WiFi.localIP());
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136 |
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137 | // Route for root / web page
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138 | server.on("/", HTTP_GET, [](AsyncWebServerRequest *request){
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139 | request->send_P(200, "text/html", index_html, processor);
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140 | });
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141 | server.on("/temperature", HTTP_GET, [](AsyncWebServerRequest *request){
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142 | request->send_P(200, "text/plain", String(t).c_str());
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143 | });
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144 | server.on("/humidity", HTTP_GET, [](AsyncWebServerRequest *request){
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145 | request->send_P(200, "text/plain", String(h).c_str());
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146 | });
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147 |
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148 | // Start server
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149 | server.begin();
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150 | }
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151 |
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152 | void loop(){
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153 | unsigned long currentMillis = millis();
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154 | if (currentMillis - previousMillis >= interval) {
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155 | // save the last time you updated the DHT values
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156 | previousMillis = currentMillis;
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157 | // Read temperature as Celsius (the default)
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158 | float newT = dht.readTemperature();
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159 | // Read temperature as Fahrenheit (isFahrenheit = true)
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160 | //float newT = dht.readTemperature(true);
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161 | // if temperature read failed, don't change t value
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162 | if (isnan(newT)) {
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163 | Serial.println("Failed to read from DHT sensor!");
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164 | }
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165 | else {
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166 | t = newT;
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167 | Serial.println(t);
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168 | }
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169 | // Read Humidity
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170 | float newH = dht.readHumidity();
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171 | // if humidity read failed, don't change h value
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172 | if (isnan(newH)) {
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173 | Serial.println("Failed to read from DHT sensor!");
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174 | }
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175 | else {
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176 | h = newH;
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177 | Serial.println(h);
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178 | }
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179 | }
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180 | }
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