#include #include #include #include #include #include #include // Display Definition #define OLED_RESET 0 // GPIO0 Adafruit_SSD1306 display(OLED_RESET); #if (SSD1306_LCDHEIGHT != 48) #error("Height incorrect, please fix Adafruit_SSD1306.h!"); #endif // DHT Definitnion #define DHTPIN 2 #define DHTTYPE DHT11 DHT dht(DHTPIN, DHTTYPE); //Start web server WiFiServer server(80); //Wifi Data const char* ssid = "IoT-Zecevic"; const char* password = "IoTSifra123456!"; //MQTT data const char* mqttServer = "192.168.1.11"; const int mqttPort = 1883; const char* mqttUser = "yourMQTTuser"; const char* mqttPassword = "yourMQTTpassword"; //Diplay and DHT update data long previousMillis = 0; long interval = 2000; //ms //Global Vars String global_power; float humidity; float temperature; //Start WiFi client WiFiClient espClient; PubSubClient MQTTclient(espClient); void callback(char* topic, byte* payload, unsigned int length) { Serial.print("Message arrived in topic: "); Serial.println(topic); Serial.print("Message:"); global_power = ""; for (int i = 0; i < length; i++) { Serial.print((char)payload[i]); global_power += char(payload[i]); } } void showDisplay() { display.clearDisplay(); display.setTextSize(1); display.setTextColor(WHITE); display.setCursor(0,0); display.println("Power: "); display.setTextSize(2); display.print(global_power); display.println(); display.setTextSize(1); display.println("Temp: "); display.setTextSize(2); display.println(temperature); display.display(); } // prepare a web page to be send to a client (web browser) String prepareHtmlPage() { String htmlPage; htmlPage.reserve(1024); // prevent ram fragmentation htmlPage = F("HTTP/1.1 200 OK\r\n" "Content-Type: text/html\r\n" "Connection: close\r\n" // the connection will be closed after completion of the response "Refresh: 5\r\n" // refresh the page automatically every 5 sec "\r\n" "" "" "

Power Producing: "); htmlPage += global_power; htmlPage += F("

" "

Temperature: "); htmlPage += temperature; htmlPage += F("

" "

Humidity: "); htmlPage += humidity; htmlPage += "

"; htmlPage += F("" "\r\n"); return htmlPage; } void setup() { Serial.begin(115200); dht.begin(); display.begin(SSD1306_SWITCHCAPVCC, 0x3C); display.clearDisplay(); WiFi.begin(ssid, password); while (WiFi.status() != WL_CONNECTED) { delay(500); Serial.println("Connecting to WiFi.."); } Serial.println("Connected to WiFi"); MQTTclient.setServer(mqttServer, mqttPort); MQTTclient.setCallback(callback); while (!MQTTclient.connected()) { Serial.println("Connecting to MQTT..."); if (MQTTclient.connect("ESP32Client", mqttUser, mqttPassword )) { Serial.println("Connected to mqtt!"); } else { Serial.print("failed with state "); Serial.print(MQTTclient.state()); delay(2000); } } //Get info from Solar MQTTclient.subscribe("solar/114182126368/0/power"); server.begin(); Serial.printf("Web server started, open %s in a web browser\n", WiFi.localIP().toString().c_str()); //show 5 sec IP on display display.clearDisplay(); display.setTextSize(1); display.setTextColor(WHITE); display.setCursor(0,0); display.println("IP addr: "); display.println(WiFi.localIP().toString().c_str()); display.display(); delay(5000); } void loop() { MQTTclient.loop(); WiFiClient serverClient = server.available(); if (serverClient) { while (serverClient.connected()) { // read line by line what the client (web browser) is requesting if (serverClient.available()) { String line = serverClient.readStringUntil('\r'); if (line.length() == 1 && line[0] == '\n') { serverClient.println(prepareHtmlPage()); break; } } } while (serverClient.available()) { serverClient.read(); } // close the connection: serverClient.stop(); } String MQTTmessage; char out[255]; unsigned long currentMillis = millis(); if(currentMillis - previousMillis > interval) { previousMillis = currentMillis; humidity = dht.readHumidity(); temperature = dht.readTemperature(); showDisplay(); MQTTclient.publish("my/office/Temperature", String(temperature).c_str()); MQTTclient.publish("my/office/Humidity", String(humidity).c_str()); } }